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LONG-TERM DEBT - Covenants (Details) - USD ($)
3 Months Ended
Mar. 06, 2019
Mar. 31, 2019
Mar. 07, 2019
Dec. 31, 2018
Apr. 30, 2018
2016 Revolving Credit Facility due 2021          
Debt Instrument [Line Items]          
Amount of liquidity and availability   $ 41,800,000      
Revolving Credit Facility | Tranche A          
Debt Instrument [Line Items]          
Commitment   400,000,000.0     $ 400,000,000
Borrowing Base   390,900,000      
Aggregate principal amount outstanding   338,200,000      
Availability   41,800,000      
Calculated borrowing base   428,400,000      
Revolving Credit Facility | Tranche B          
Debt Instrument [Line Items]          
Commitment $ 41,500,000.0 41,500,000.0     $ 41,500,000.0
Borrowing Base   37,500,000 $ 41,300,000    
Aggregate principal amount outstanding   37,500,000      
Availability   0 $ 37,300,000    
Covenant terms, consolidated fixed charge coverage ratio 100.00%        
Revolving Credit Facility | 2016 Revolving Credit Facility due 2021          
Debt Instrument [Line Items]          
Commitment   441,500,000.0      
Borrowing Base   428,400,000      
Aggregate principal amount outstanding   375,700,000      
Availability   $ 41,800,000      
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   $ 10,900,000   $ 10,100,000  
Sublimit, letters of credit | Tranche A          
Debt Instrument [Line Items]          
Standby and trade letters of credit for various corporate purposes   $ 10,900,000