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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
12 Months Ended
Jan. 08, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 1,300,000 $ 2,900,000 $ 1,900,000  
PBO forfeitures (in shares)   285,714      
Awards vested (in shares)   51,216 238,413    
Stock Appreciation Rights          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards forfeited (in shares)   466,470      
Exercise price (in dollars per share)   $ 42.71      
Awards outstanding (in shares)   0      
2014 Long Term Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of issuable common shares (in shares)   3,300,000      
2014 Long Term Incentive Plan | Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost (in thousands)   $ 178,000 $ 508,000    
Share-based vested during period (in shares)   71,944 76,152 45,753  
Awards forfeited (in shares)   19,999 8,600 11,020  
Awards outstanding (in shares)   10,475.000 48,232 108,658 142,131
2014 Long Term Incentive Plan | Performance-Based Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense     $ 428,000    
Awards expiration period   10 years      
PBO forfeitures (in shares) 285,714 285,714      
Outstanding (in shares) 167,619 167,619.000 453,333 453,333  
Awards vested (in shares)     87,302    
PBO exercisable (in shares)   0 0    
Unrecognized costs related to unvested awards   $ 0 $ 428,000    
2014 Long Term Incentive Plan | Officer | 2014 4.58-Year Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards expiration period   4 years 7 months      
2014 Long Term Incentive Plan | Officer | Performance-Based Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   3 years      
Options exercisable threshold trading days   30 days      
Exercisable threshold, percentage of grant date stock price   125.00%      
2014 Long Term Incentive Plan | Former CEO | Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense     $ 651,000    
Share-based vested during period (in shares)     35,714