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STOCK-BASED AWARDS (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Weighted Average Exercise Price      
Stock-based compensation expense $ 3,526,000 $ 4,035,000 $ 3,251,000
Stock options      
Stock-Based Awards      
Stock options, expiration period 10 years    
Vesting period 4 years    
Number of shares available for future grants 2,500,000    
Options      
Outstanding—beginning of year (in shares) 224,000 273,000 364,000
Exercised (in shares) (16,000) (30,000) (89,000)
Expired/Forfeited (in shares) (4,000) (19,000) (2,000)
Outstanding—end of year (in shares) 204,000 224,000 273,000
Options exercisable at year-end (in shares) 204,000 224,000 273,000
Weighted Average Exercise Price      
Outstanding—beginning of year (in dollars per share) $ 17.27 $ 17.30 $ 17.34
Exercised (in dollars per share) 16.94 17.08 17.45
Expired/Forfeited (in dollars per share) 18.26 18.00 17.08
Outstanding—end of year (in dollars per share) 17.27 17.27 17.30
Options exercisable at year-end (in dollars per share) $ 17.27 $ 17.27 $ 17.30
Options Outstanding, Weighted Average Remaining Contract Life 1 year 1 month 20 days    
Options Outstanding, Aggregate Intrinsic Value $ 2,000    
Options Exercisable, Weighted Average Remaining Contract Life 1 year 1 month 20 days    
Options Exercisable, Aggregate Intrinsic Value $ 2,000    
Stock-based compensation expense $ 0 $ 0 $ 0
Stock price (in dollars per share) $ 12.28    
Intrinsic value of options exercised $ 92,000 126,000 728,000
Proceeds from exercise of employee stock options 269,000 $ 511,000 1,600,000
Tax benefit realized from stock-based compensation $ 0    
Stock options | First year      
Weighted Average Exercise Price      
Percentage of award vesting at the end of the year 28.00%    
Stock options | Monthly      
Weighted Average Exercise Price      
Percentage of award vesting at the end of the year 2.00%    
Restricted stock awards      
Stock-Based Awards      
Vesting period 3 years 3 years  
Weighted Average Exercise Price      
Percentage of award vesting at the end of the year 33.30% 33.30%  
Conversion of units to common stock (shares) 1    
Stock-based compensation expense $ 3,500,000 $ 4,000,000 $ 3,300,000
Units      
Outstanding-beginning of year (in shares) 578,000 704,000 1,003,000
Granted at fair value (in shares) 239,000 242,000 275,000
Vested (in shares) (377,000) (301,000) (339,000)
Forfeited (in shares) (91,000) (67,000) (235,000)
Outstanding-end of period (in shares) 349,000 578,000 704,000
Weighted Average Grant Date Fair Value      
Outstanding-beginning of year (in dollars per share) $ 16.70 $ 10.79 $ 8.81
Granted at fair value (in dollars per share) 24.60 28.24 16.12
Vested (in dollars per share) 12.34 11.87 10.23
Forfeited (in dollars per share) 24.35 17.70 9.38
Outstanding-end of period (in dollars per share) $ 24.80 $ 16.70 $ 10.79
Restricted stock awards | First year      
Weighted Average Exercise Price      
Percentage of award vesting at the end of the year     40.00%
Restricted stock awards | Second year      
Weighted Average Exercise Price      
Percentage of award vesting at the end of the year     30.00%
Restricted stock awards | Third year      
Weighted Average Exercise Price      
Percentage of award vesting at the end of the year     30.00%