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CAPITAL STOCK - NARRATIVE (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 26, 2016
shares
Mar. 02, 2016
shares
Mar. 17, 2015
shares
Dec. 31, 2010
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
$ / shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
shares
Dec. 31, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Reverse stock split conversion ratio       0.10            
Fair value of stock options granted during period | $             $ 267 $ 258    
Weighted average grant date fair value | $ / shares             $ 13.83 $ 8.88    
Intrinsic value of options exercised | $             $ 1,600 $ 1,900    
Proceeds from stock options exercised | $             660 $ 715    
Unrecognized compensation expense to be recognized during the remainder of fiscal year | $         $ 485   $ 485      
Weighted average purchase price of shares purchased | $ / shares         $ 7.64 $ 5.75 $ 6.87 $ 5.67    
Stockholder ownership percentage, threshold for restrictions                 5.00%  
Kevin S. Wilson                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares vested during period 27,500                  
Excluded Stock Options                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Options outstanding         4.2   4.2      
Options outstanding, weighted average remaining contractual term             6 months      
Options outstanding, weighted average exercise price | $ / shares         $ 18.69   $ 18.69      
Exercise price, lower range limit | $ / shares             17.17      
Exercise price, upper range limit | $ / shares             $ 22.50      
Employee Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares issued during period             4,497 6,043    
Employee Stock Option                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Intrinsic value of options exercised | $             $ 16,300      
Options outstanding         888,995   888,995   940,610 1,074,251
Total unrecognized compensation expense related to outstanding stock options | $         $ 2,000   $ 2,000      
Period for recognition of unrecognized compensation expense             1 year 7 months 6 days      
Intrinsic value of options outstanding | $         $ 20,100   $ 20,100      
Performance Shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares issued during period     52,956              
Performance Shares | Management Incentive Plan (MIP) Grants 2015                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares issued during period     24,649              
Shares vested during period   14,364                
Shares withheld for income tax expense   4,788                
Performance shares canceled   10,285                
Performance Shares | Management Incentive Plan (MIP) Grants 2016                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares issued during period   15,000