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Stock Based Compensation - Summary of Restricted Stock Awards and Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-based compensation              
Proceeds from exercise of stock options         $ 111    
Common Stock              
Options              
Exercised (in shares)         26,350    
A&R 2004 Plan | Common Stock              
Stock-based compensation              
Shares reserved for issuance       0      
2010 Plan | Common Stock              
Stock-based compensation              
Maximum number of shares of common stock that may be issued       2,130,000      
Number of shares of common stock available for grant       1,223,945      
Restricted Stock Share Awards              
Shares              
Unvested at the beginning of the period (in shares) 14,701 85,021 169,903 14,701 85,021 169,903  
Vested (in shares)       (14,701) (70,320) (84,882)  
Unvested at the end of the period (in shares)         14,701 85,021 169,903
Weighted Average Grant Date Fair Value              
Unvested at the beginning of the period (in dollars per share) $ 14.78 $ 13.02 $ 13.03 $ 14.78 $ 13.02 $ 13.03  
Vested (in dollars per share)       $ 14.78 12.65 13.05  
Unvested at the end of the period (in dollars per share)         $ 14.78 $ 13.02 $ 13.03
Weighted Average Remaining Contractual Term              
Unvested at the beginning of the period         4 days 6 months 4 days 1 year 4 months 2 days
Unvested at the end of the period         4 days 6 months 4 days 1 year 4 months 2 days
Restricted Stock Unit Awards              
Shares              
Unvested at the beginning of the period (in shares) 48,665 81,623 43,348 48,665 81,623 43,348  
Granted (in shares)       131,765 116,141 140,291  
Vested (in shares)       (132,640) (147,217) (102,016)  
Cancelled and forfeited (in shares)         (1,882)    
Unvested at the end of the period (in shares)       47,790 48,665 81,623 43,348
Expected to vest in the future, at the end of the period (in shares)       46,070      
Weighted Average Grant Date Fair Value              
Unvested at the beginning of the period (in dollars per share) $ 17.33 $ 15.05 $ 14.46 $ 17.33 $ 15.05 $ 14.46  
Granted (in dollars per share) $ 19.88 $ 22.63 $ 16.30 21.37 18.72 15.29  
Vested (in dollars per share)       20.27 16.51 15.13  
Cancelled and forfeited (in dollars per share)         15.82    
Unvested at the end of the period (in dollars per share)       20.31 $ 17.33 $ 15.05 $ 14.46
Expected to vest in the future, at the end of the period (in dollars per share)       $ 20.31      
Weighted Average Remaining Contractual Term              
Unvested at the beginning of the period       11 months 16 days 1 year 1 year 1 month 2 days 1 year 6 months 18 days
Granted       4 months 6 days 4 months 24 days 8 months 23 days  
Unvested at the end of the period       11 months 16 days 1 year 1 year 1 month 2 days 1 year 6 months 18 days
Expected to vest in future, at the end of the period       11 months 16 days      
Stock Options | A&R 2004 Plan              
Stock-based compensation              
Proceeds from exercise of stock options       $ 111      
Options              
Outstanding stock options       0 0 37,240  
Exercised (in shares)       0 26,350 0  
Cancelled (in shares)         10,890    
Options Weighted average price              
weighted average exercise price           $ 4.21  
Options, additional disclosure              
Weighted-average remaining contractual life of stock awards           1 year 8 months 12 days  
Weighted-average remaining contractual life of exercisable stock awards           1 year 8 months 12 days  
Aggregate intrinsic value of exercisable stock awards           $ 641