Quarterly report pursuant to Section 13 or 15(d)

Employee Stock Plans (Details)

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Employee Stock Plans (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
Stock Incentive Plan 2010 [Member]
Mar. 31, 2014
Restricted Stock [Member]
Dec. 31, 2013
Restricted Stock [Member]
Mar. 31, 2014
Performance Shares [Member]
Stock Incentive Plan 2010 [Member]
Mar. 31, 2014
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Mar. 31, 2014
Restricted Stock Units (RSUs) [Member]
Director [Member]
Mar. 31, 2014
Restricted Stock Units (RSUs) [Member]
Management [Member]
age
Mar. 31, 2013
Restricted Stock Units (RSUs) [Member]
Management [Member]
Mar. 31, 2014
Employee Stock Option [Member]
Amended and Restated 2004 Stock Incentive Plan [Member]
Stock-based compensation                    
Number of shares of common stock reserved for issuance                   37,240
Expiration period                   10 years
Number of awards permitted to be issued (in shares)                   0
Stock options exercised (in shares)                   0
Maximum number of shares of common stock that may be issued 2,130,000                  
Shares                    
Unvested at the beginning of the period (in shares)   13.03     43,348.00          
Granted (in shares)   0     140,291          
Vested (in shares)   (14.78)     (100,620.00)          
Unvested at the end of the period (in shares)   12.44 13.03   83,019.00 43,348.00        
Expected to vest in the future, at the end of the period (in shares)   12.44     80,030.00          
Weighted Average Grant Date Fair Value                    
Unvested at the beginning of the period (in dollars per share)   $ 169,903.00     $ 14.46          
Granted (in dollars per share)       $ 16.30 $ 15.29          
Vested (in dollars per share)   $ 43,263.00     $ 15.14          
Unvested at the end of the period (in dollars per share)   $ 126,640.00 $ 169,903.00   $ 15.04 $ 14.46        
Cancelled and forfeited (in dollars per share)   $ 0.00     $ 0.00          
Expected to vest in the future, at the end of the period (in dollars per share)   $ 122,081.00     $ 15.04          
Weighted Average Remaining Contractual Term                    
Unvested at the beginning of the period   1 year 2 months 12 days 1 year 4 months 2 days   1 year 9 months 26 days 1 year 6 months 18 days        
Granted         1 year 29 days          
Unvested at the end of the period   1 year 2 months 12 days 1 year 4 months 2 days   1 year 9 months 26 days 1 year 6 months 18 days        
Expected to vest in future, at the end of the period   1 year 2 months 12 days     1 year 9 months 26 days          
Recognized and unrecognized compensation expense with weighted average recognition period                    
Vesting period of awards       2 years            
Compensation expenses recognized   $ 215   $ 49 $ 758          
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest   1,004   723 1,106          
Weighted average period over which unrecognized compensation expense is expected to be recognized   1 year 2 months 12 days                
Minimum age of employee, attaining which awards are continued to be vested upon retirement               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               55    
Accelerated stock based compensation expense               $ 278 $ 261  
Number of shares issued upon exercise of units other than options             1 1