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DEBT - Covenants (Details) - USD ($)
Mar. 06, 2019
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Cash and cash equivalents   $ 104,300,000 $ 87,300,000
Foreign Subsidiaries      
Debt Instrument [Line Items]      
Cash and cash equivalents   102,500,000  
Amended 2019 Senior Line of Credit Facility      
Debt Instrument [Line Items]      
Commitment   30,000,000.0  
Aggregate principal amount outstanding   0  
Availability   30,000,000.0  
Revolving Credit Facility | Tranche A      
Debt Instrument [Line Items]      
Commitment   400,000,000.0  
Borrowing Base   400,000,000.0  
Aggregate principal amount outstanding   230,900,000  
Availability   157,700,000  
Revolving Credit Facility | Tranche B      
Debt Instrument [Line Items]      
Commitment $ 41,500,000 41,500,000  
Borrowing Base 41,300,000 41,500,000  
Aggregate principal amount outstanding   41,500,000  
Availability $ 37,300,000 0  
Covenant terms, consolidated fixed charge coverage ratio 100.00%    
Revolving Credit Facility | Amended 2016 Revolving Credit Facility      
Debt Instrument [Line Items]      
Commitment   441,500,000  
Borrowing Base   441,500,000  
Aggregate principal amount outstanding   272,400,000  
Availability   157,700,000  
Sublimit, letters of credit      
Debt Instrument [Line Items]      
Standby and trade letters of credit for various corporate purposes   11,400,000 $ 10,100,000
Sublimit, letters of credit | Tranche A      
Debt Instrument [Line Items]      
Standby and trade letters of credit for various corporate purposes   $ 11,400,000