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DEBT - Senior Secured Notes (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 07, 2018
Aug. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 02, 2018
Sep. 30, 2018
Nov. 30, 2017
Feb. 28, 2017
Line of Credit Facility [Line Items]                  
Loss on extinguishment of debt     $ 0 $ 90,569,000 $ 12,458,000        
Debt     $ 790,544,000 804,140,000          
8.25% Senior Notes Due 2025                  
Line of Credit Facility [Line Items]                  
Stated interest rate     8.25%            
Senior Notes | 8.25% Senior Notes Due 2025                  
Line of Credit Facility [Line Items]                  
Stated interest rate   8.25% 8.25%       8.25%    
Debt instrument, face amount   $ 690,000,000.0              
Debt issuance costs capitalized   $ 11,700,000              
Debt instrument, term   5 years              
Loss on extinguishment of debt       69,200,000          
Debt     $ 678,323,000 $ 676,661,000          
Senior Notes | 12.00% Senior Secured Notes                  
Line of Credit Facility [Line Items]                  
Stated interest rate     12.00%     12.00%   12.00%  
Debt instrument, face amount           $ 135,000,000.0   $ 135,000,000.0 $ 470,000,000.0
Debt issuance costs capitalized               $ 18,300,000  
Amount of redemption $ 77,500,000                
Redemption price, percentage of redemption amount (as percent) 112.00%                
Loss on extinguishment of debt $ 11,700,000                
Debt $ 527,500,000