Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Details)

v3.3.1.900
Stock-Based Compensation (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
$ / shares
shares
Mar. 31, 2015
$ / shares
shares
Mar. 31, 2014
$ / shares
shares
Mar. 31, 2013
$ / shares
shares
Dec. 31, 2015
USD ($)
item
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Dec. 31, 2012
$ / shares
shares
Options                
Exercised (in shares)         26,350      
Common Stock                
Options                
Exercised (in shares)         26,350      
2010 Plan | Common Stock                
Stock-based compensation                
Number of shares of common stock available for grant         1,372,159      
Maximum number of shares of common stock that may be issued         2,130,000      
Restricted Stock Share Awards                
Shares                
Unvested at the beginning of the period (in shares) 14,701 85,021 169,903 208,823 85,021 169,903 208,823  
Granted (in shares)             44,022  
Vested (in shares)         70,320 84,882 82,942  
Unvested at the end of the period (in shares)         14,701 85,021 169,903 208,823
Expected to vest in the future, at the end of the period (in shares)         14,701      
Weighted Average Grant Date Fair Value                
Unvested at the beginning of the period (in dollars per share) | $ / shares $ 14.78 $ 13.02 $ 13.03 $ 12.63 $ 13.02 $ 13.03 $ 12.63  
Granted (in dollars per share) | $ / shares             14.78  
Vested (in dollars per share) | $ / shares         12.65 13.05 12.97  
Unvested at the end of the period (in dollars per share) | $ / shares         14.78 $ 13.02 $ 13.03 $ 12.63
Expected to vest in the future, at the end of the period (in dollars per share) | $ / shares         $ 14.78      
Weighted Average Remaining Contractual Term                
Unvested at the beginning of the period         4 days 6 months 4 days 1 year 4 months 2 days 1 year 11 months 9 days
Granted             2 years  
Unvested at the end of the period         4 days 6 months 4 days 1 year 4 months 2 days 1 year 11 months 9 days
Expected to vest in future, at the end of the period         4 days      
Restricted Stock Share Awards | 2010 Plan                
Recognized and unrecognized compensation expense with weighted average recognition period                
Compensation expenses recognized | $         $ 385 $ 891 $ 1,126  
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | $         0 360    
Performance Share Unit Awards                
Recognized and unrecognized compensation expense with weighted average recognition period                
Compensation expenses recognized | $         1,247 $ 730 $ 609  
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | $         $ 349      
Performance Share Unit Awards | 2010 Plan                
Recognized and unrecognized compensation expense with weighted average recognition period                
Number of performance shares units that will be converted into RSUs 71,428 71,981 74,516          
Restricted Stock Unit Awards                
Shares                
Unvested at the beginning of the period (in shares) 48,665 81,623 43,348 26,046 81,623 43,348 26,046  
Granted (in shares)         116,141 140,291 70,324  
Vested (in shares)         147,217 102,016 53,022  
Cancelled and forfeited (in shares)         (1,882)      
Unvested at the end of the period (in shares)         48,665 81,623 43,348 26,046
Expected to vest in the future, at the end of the period (in shares)         46,913      
Weighted Average Grant Date Fair Value                
Unvested at the beginning of the period (in dollars per share) | $ / shares $ 17.33 $ 15.05 $ 14.46 $ 14.73 $ 15.05 $ 14.46 $ 14.73  
Granted (in dollars per share) | $ / shares   $ 22.63 $ 16.30 $ 14.40 18.72 15.29 14.52  
Vested (in dollars per share) | $ / shares         16.51 15.13 14.68  
Cancelled and forfeited (in dollars per share) | $ / shares         15.82      
Unvested at the end of the period (in dollars per share) | $ / shares         17.33 $ 15.05 $ 14.46 $ 14.73
Expected to vest in the future, at the end of the period (in dollars per share) | $ / shares         $ 17.33      
Weighted Average Remaining Contractual Term                
Unvested at the beginning of the period         1 year 1 year 1 month 2 days 1 year 6 months 18 days 8 months 19 days
Granted         4 months 24 days 8 months 23 days 9 months 26 days  
Unvested at the end of the period         1 year 1 year 1 month 2 days 1 year 6 months 18 days 8 months 19 days
Expected to vest in future, at the end of the period         1 year      
Recognized and unrecognized compensation expense with weighted average recognition period                
Vesting period of awards   2 years            
Restricted Stock Unit Awards | 2010 Plan                
Recognized and unrecognized compensation expense with weighted average recognition period                
Compensation expenses recognized | $         $ 1,643 $ 1,247 $ 852  
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | $         $ 403      
Minimum age of employee, attaining which awards are continued to be vested upon retirement | item         65      
Minimum service period, upon serving which awards are continued to be vested upon retirement         10 years      
Minimum age of employee along with service period condition, attaining which awards are continued to be vested upon retirement | item         55      
Maximum period following a termination of service in which the share-based award will be settled         2 months 15 days      
Percentage of RSUs issued that will immediately vest and be converted into common shares   33.33%            
Percentage of RSUs issued that will vest ratably over the remaining vesting period   66.67%            
Restricted Stock Unit Awards | 2010 Plan | Management                
Recognized and unrecognized compensation expense with weighted average recognition period                
Accelerated stock based compensation expense | $         $ 303 $ 278    
Restricted Stock Unit Awards | 2010 Plan | Common Stock                
Recognized and unrecognized compensation expense with weighted average recognition period                
Number of shares issued upon exercise of units other than options         1      
Stock Options | A&R 2004 Plan                
Options                
Balance at the beginning of the period (in share)   37,240 37,240   37,240 37,240    
Cancelled (in shares)         10,890      
Balance at the end of the period (in per share)           37,240 37,240  
Options Weighted average price                
Outstanding at the beginning of the year (in dollars per share) | $ / shares   $ 4.21     $ 4.21      
Outstanding at the end of the year (in dollars per share) | $ / shares           $ 4.21    
Options, additional disclosure                
Weighted-average remaining contractual life of stock awards           1 year 8 months 12 days 2 years 8 months 12 days  
Weighted-average remaining contractual life of exercisable stock awards           1 year 8 months 12 days 2 years 8 months 12 days  
Aggregate intrinsic value of exercisable stock awards | $             $ 641