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CAPITAL STOCK - NARRATIVE (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Mar. 17, 2018
shares
Mar. 07, 2018
tranche
shares
Jun. 15, 2017
shares
May 31, 2017
shares
May 01, 2017
shares
Mar. 26, 2017
tranche
shares
Mar. 02, 2016
shares
Mar. 17, 2015
shares
Mar. 26, 2014
tranche
shares
Dec. 31, 2010
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
May 07, 2018
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 | $                     $ 3,500 $ 9  
Weighted average grant date fair value | $ / shares                     $ 26.69 $ 30.20  
Intrinsic value of options exercised | $                     $ 406 $ 6,300  
Proceeds from stock options exercised | $                     $ 121 $ 554  
Weighted average purchase price of shares purchased | $ / shares                     $ 14.28 $ 13.41  
Stockholder ownership percentage, threshold for restrictions                     5.00%    
Share Purchase Plan 1997                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares issued during period under options   130,000                      
Share Purchase Plan 1997 | Non-employee director                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares issued during period under options   120,000                      
Employee Stock Option                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Intrinsic value of options exercised | $                     $ 28,100    
Total unrecognized compensation expense related to outstanding stock options | $                     $ 6,300    
Period for recognition of unrecognized compensation expense                     2 years 2 months 24 days    
Intrinsic value of options outstanding | $                     $ 32,200    
Employee Stock                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares issued during period                     3,127 3,204  
Restricted Stock                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Total unrecognized compensation expense related to outstanding stock options | $                     $ 4,100    
Period for recognition of unrecognized compensation expense                     2 years 3 months 18 days    
Number of tranches in share-based payment award | tranche   3                      
Equity instruments other than options, shares tied to S&P 500 Index                         27,539
Restricted Stock | Minimum                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Equity instruments other than options, performance period   2 years                      
Restricted Stock | Maximum                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Equity instruments other than options, performance period   4 years                      
Restricted Stock | Non-employee director                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares issued during period         2,720,000                
Restricted Stock | Kevin S. Wilson                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares issued during period           27,500     110,000        
Number of tranches in share-based payment award | tranche           4     4        
Performance Shares                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares issued during period       23,700,000       52,956          
Performance Shares | Management Incentive Plan Grants 2015                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested during period 52,956                        
Performance shares canceled 0                        
Shares withheld for income tax expense 14,334                        
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            
Shares vested during period             14,629            
Performance shares canceled             371            
Shares withheld for income tax expense             4,133            
Performance Shares | Management Incentive Plan (MIP) Grants 2017                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares issued during period     6,594,000                    
Performance Restricted Common Stock and Stock Options                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares issued during period under options   128,500                      
Performance Restricted Common Stock and Stock Options | Share Purchase Plan 1997                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares issued during period under options   118,500