Quarterly report pursuant to Section 13 or 15(d)

Employee Stock Plans (Details)

v3.3.0.814
Employee Stock Plans (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Mar. 31, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Sep. 30, 2015
USD ($)
age
$ / shares
shares
Sep. 30, 2014
USD ($)
Dec. 31, 2014
$ / shares
shares
Options Weighted average price              
Exercised (in dollars per share) | $ / shares $ 111       $ 111    
2010 Plan              
Stock-based compensation              
Maximum number of shares of common stock that may be issued 2,130,000       2,130,000    
Restricted Stock Share Awards              
Shares              
Unvested at the beginning of the period (in shares)   85,021     85,021    
Vested (in shares)         70,320    
Cancelled and forfeited (in shares)         0    
Unvested at the end of the period (in shares) 14,701       14,701   85,021
Expected to vest in the future, at the end of the period (in shares) 14,172       14,172    
Weighted Average Grant Date Fair Value              
Unvested at the beginning of the period (in dollars per share) | $ / shares   $ 13.02     $ 13.02    
Granted (in dollars per share) | $ / shares         0.00    
Vested (in dollars per share) | $ / shares         12.65    
Unvested at the end of the period (in dollars per share) | $ / shares $ 14.78       14.78   $ 13.02
Expected to vest in the future, at the end of the period (in dollars per share) | $ / shares $ 14.78       $ 14.78    
Weighted Average Remaining Contractual Term              
Unvested at the beginning of the period 3 months           6 months 4 days
Unvested at the end of the period 3 months           6 months 4 days
Expected to vest in future, at the end of the period 3 months            
Recognized and unrecognized compensation expense with weighted average recognition period              
Compensation expenses recognized | $ $ 52,000   $ 215,000   $ 325,000 $ 660,000  
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | $ 52,000       $ 52,000    
Weighted average period over which unrecognized compensation expense is expected to be recognized     3 months        
Performance Share Unit Awards | 2010 Plan              
Weighted Average Grant Date Fair Value              
Granted (in dollars per share) | $ / shares   $ 22.63          
Recognized and unrecognized compensation expense with weighted average recognition period              
Vesting period of awards         2 years    
Compensation expenses recognized | $ 396,000   $ 171,000   $ 925,000 390,000.000  
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | $ $ 767,000       $ 767,000    
Restricted Stock Unit Awards              
Shares              
Unvested at the beginning of the period (in shares)   81,623     81,623    
Granted (in shares)         116,141    
Vested (in shares)         131,504    
Cancelled and forfeited (in shares)         (1,882)    
Unvested at the end of the period (in shares) 64,378       64,378   81,623
Expected to vest in the future, at the end of the period (in shares) 62,060       62,060    
Weighted Average Grant Date Fair Value              
Unvested at the beginning of the period (in dollars per share) | $ / shares   $ 15.05     $ 15.05    
Granted (in dollars per share) | $ / shares         18.72    
Vested (in dollars per share) | $ / shares         16.43    
Cancelled and forfeited (in dollars per share) | $ / shares         15.82    
Unvested at the end of the period (in dollars per share) | $ / shares $ 17.29       17.29   $ 15.05
Expected to vest in the future, at the end of the period (in dollars per share) | $ / shares $ 17.29       $ 17.29    
Weighted Average Remaining Contractual Term              
Unvested at the beginning of the period 11 months 19 days           1 year 1 month 2 days
Granted         5 months 23 days    
Unvested at the end of the period 11 months 19 days           1 year 1 month 2 days
Expected to vest in future, at the end of the period 11 months 19 days            
Recognized and unrecognized compensation expense with weighted average recognition period              
Compensation expenses recognized | $ $ 311,000   $ 160,000   $ 1,490,000 $ 1,093,000  
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | $ $ 544,000       $ 544,000    
Restricted Stock Unit Awards | Non-employee director              
Recognized and unrecognized compensation expense with weighted average recognition period              
Number of shares issued upon exercise of units other than options         1    
Restricted Stock Unit Awards | Management              
Recognized and unrecognized compensation expense with weighted average recognition period              
Minimum age of employee, attaining which awards are continued to be vested upon retirement | age         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 | age         55    
Accelerated stock based compensation expense | $   $ 303,000   $ 278,000      
Restricted Stock Unit Awards | Common Stock | Management              
Recognized and unrecognized compensation expense with weighted average recognition period              
Number of shares issued upon exercise of units other than options   1          
Restricted Stock Unit Awards | 2010 Plan              
Recognized and unrecognized compensation expense with weighted average recognition period              
Maximum period following a termination of service in which the share-based award will be settled         2 months 15 days    
Stock Options | A&R 2004 Plan              
Stock-based compensation              
Number of shares of common stock available for grant 0       0    
Options              
Exercised (in shares) 0       0