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CAPITAL STOCK - NARRATIVE (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 15, 2017
shares
May 01, 2017
shares
May 31, 2016
shares
Mar. 02, 2016
shares
Mar. 17, 2015
shares
Mar. 26, 2014
tranche
shares
Dec. 31, 2010
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
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 | $                   $ 993 $ 277
Weighted average grant date fair value | $ / shares                   $ 37.41 $ 13.96
Intrinsic value of options exercised | $                   $ 16,500 $ 2,800
Proceeds from stock options exercised | $                   $ 1,800 $ 740
Weighted average purchase price of shares purchased | $ / shares               $ 16.49 $ 9.87 $ 15.90 $ 7.64
Stockholder ownership percentage, threshold for restrictions               5.00%      
Employee Stock Option                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Intrinsic value of options exercised | $                   $ 31,700  
Total unrecognized compensation expense related to outstanding stock options | $               $ 4,200   $ 4,200  
Period for recognition of unrecognized compensation expense                   1 year 7 months 2 days  
Intrinsic value of options outstanding | $               $ 39,000   $ 39,000  
Employee Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares issued during period               2,515 3,583 8,058 13,965
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           110,000          
Number of tranches in share-based payment award | tranche           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 (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                    
Vesting period 1 year