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Stock-Based Compensation (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
age
$ / shares
shares
Mar. 31, 2015
USD ($)
Dec. 31, 2015
$ / shares
shares
2010 Plan      
Stock-based compensation      
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    
Vested (in shares) (14,701)    
Cancelled and forfeited (in shares) 0    
Unvested 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    
Granted (in dollars per share) | $ / shares 0.00    
Vested (in dollars per share) | $ / shares $ 14.78    
Unvested 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
Unvested at the end of the period     4 days
Recognized and unrecognized compensation expense with weighted average recognition period      
Compensation expenses recognized | $ $ 0 $ 165  
Performance Share Unit Awards | 2010 Plan      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share) | $ / shares $ 19.88    
Recognized and unrecognized compensation expense with weighted average recognition period      
Vesting period of awards 2 years    
Compensation expenses recognized | $ $ 127 127  
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | $ $ 1,430    
Restricted Stock Unit Awards      
Shares      
Unvested at the beginning of the period (in shares) 48,665    
Granted (in shares) 131,765    
Vested (in shares) (131,638)    
Unvested at the end of the period (in shares) 48,792   48,665
Expected to vest in the future, at the end of the period (in shares) 47,035    
Weighted Average Grant Date Fair Value      
Unvested at the beginning of the period (in dollars per share) | $ / shares $ 17.33    
Granted (in dollars per share) | $ / shares 21.37    
Vested (in dollars per share) | $ / shares 20.27    
Cancelled and forfeited (in dollars per share) | $ / shares 0.00    
Unvested at the end of the period (in dollars per share) | $ / shares 20.30   $ 17.33
Expected to vest in the future, at the end of the period (in dollars per share) | $ / shares $ 20.30    
Weighted Average Remaining Contractual Term      
Unvested at the beginning of the period 1 year 8 months 27 days   1 year
Granted 6 months 26 days    
Unvested at the end of the period 1 year 8 months 27 days   1 year
Expected to vest in future, at the end of the period 1 year 8 months 27 days    
Recognized and unrecognized compensation expense with weighted average recognition period      
Compensation expenses recognized | $ $ 742 832  
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | $ $ 829    
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 | $ $ 528 $ 303  
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