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LONG-TERM DEBT - Covenants (Details) - USD ($)
6 Months Ended
Mar. 06, 2019
Jun. 30, 2019
Dec. 31, 2018
Apr. 30, 2018
Amended 2016 Revolving Credit Facility due 2021        
Debt Instrument [Line Items]        
Amount of liquidity and availability   $ 22,800,000    
2019 Senior Line of Credit Facility        
Debt Instrument [Line Items]        
Commitment   30,000,000    
Aggregate principal amount outstanding   0    
Availability   30,000,000    
Revolving Credit Facility | Tranche A        
Debt Instrument [Line Items]        
Commitment   400,000,000   $ 400,000,000
Borrowing Base   389,500,000    
Aggregate principal amount outstanding   355,900,000    
Availability   22,800,000    
Calculated borrowing base   428,500,000    
Revolving Credit Facility | Tranche B        
Debt Instrument [Line Items]        
Commitment $ 41,500,000.0 41,500,000.0   $ 41,500,000.0
Borrowing Base 41,300,000 39,000,000    
Aggregate principal amount outstanding   39,000,000    
Availability $ 37,300,000 0    
Covenant terms, consolidated fixed charge coverage ratio 100.00%      
Revolving Credit Facility | Amended 2016 Revolving Credit Facility due 2021        
Debt Instrument [Line Items]        
Commitment   441,500,000.0    
Borrowing Base   428,500,000    
Aggregate principal amount outstanding   394,900,000    
Availability   $ 22,800,000    
Covenant terms, consolidated fixed charge coverage ratio   100.00%    
Sublimit, letters of credit        
Debt Instrument [Line Items]        
Standby and trade letters of credit for various corporate purposes   $ 10,800,000 $ 10,100,000  
Sublimit, letters of credit | Tranche A        
Debt Instrument [Line Items]        
Standby and trade letters of credit for various corporate purposes   $ 10,800,000