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LONG-TERM DEBT - Narrative (Details) - USD ($)
3 Months Ended
Mar. 06, 2019
Mar. 05, 2019
Jun. 30, 2019
Dec. 31, 2018
Apr. 30, 2018
Sep. 07, 2016
Debt Instrument [Line Items]            
Outstanding borrowings     $ 3,132,500,000 $ 3,075,800,000    
Cash and cash equivalents     63,000,000 87,300,000    
5.75% Senior Notes due 2021            
Debt Instrument [Line Items]            
Outstanding borrowings     $ 497,400,000 496,600,000    
Stated interest rate     5.75%   5.75%  
6.25% Senior Notes due 2024            
Debt Instrument [Line Items]            
Outstanding borrowings     $ 442,100,000 $ 441,400,000    
Stated interest rate     6.25%     6.25%
Line of Credit | 2019 Senior Line of Credit Agreement            
Debt Instrument [Line Items]            
Maximum borrowing capacity     $ 30,000,000      
Outstanding borrowings     $ 0      
Stated interest rate     8.00%      
Borrowings under facility     $ 0      
Repayments under facility     0      
Revolving Credit Facility | Amended 2016 Revolving Credit Facility, Tranche B            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 41,500,000.0   41,500,000.0   $ 41,500,000.0  
Outstanding borrowings         $ 39,000,000  
Potential increase of maximum borrowing capacity 5.00%          
Covenant terms, liquidity $ 50,000,000 $ 35,000,000        
Covenant terms, percentage of maximum 15.00% 10.00%        
Remaining borrowing capacity $ 37,300,000   0      
Borrowing base $ 41,300,000   39,000,000      
Covenant terms, consolidated fixed charge coverage ratio 100.00%          
Covenant terms, liquidity threshold, consecutive business days 20 days 20 days        
Foreign Subsidiaries            
Debt Instrument [Line Items]            
Cash and cash equivalents     $ 59,100,000