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STOCK-BASED COMPENSATION - Stock Incentive Plans and Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
STOCK-BASED COMPENSATION PLANS      
Shares of common stock available for grant under stock incentive plans 748,686    
Restricted Stock      
Stock-Based Compensation      
Weighted average value (in dollars per share) $ 27.37 $ 11.26 $ 7.73
Service period over which value of the shares is amortized to compensation expense 3 years    
Number of Nonvested Restricted Shares      
Outstanding at beginning of period (in shares) 487,678 520,195 243,124
Awarded (in shares) 76,714 168,334 423,518
Forfeited (in shares) (7,066) (42,141) (3,181)
Vested (in shares) (190,127) (158,710) (143,266)
Outstanding at end of period (in shares) 367,199 487,678 520,195
Additional disclosures      
Compensation expense, net of forfeitures $ 1,744 $ 1,541 $ 927
Unrecognized compensation expense 3,384    
Unrecognized compensation expense, expected to be recognized in next fiscal year $ 1,563    
Restricted Stock | Performance based vesting      
Number of Nonvested Restricted Shares      
Outstanding at beginning of period (in shares) 5,892 15,190 10,000
Awarded (in shares) 41,792 88,566 307,214
Performance criteria met (in shares) (14,200) (92,583) (267,080)
Forfeited (in shares) (4,296) (5,281) (34,944)
Outstanding at end of period (in shares) 29,188 5,892 15,190