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Debt (Details Textual) - USD ($)
6 Months Ended
Jul. 16, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Line of Credit Facility [Line Items]        
Payments on long-term debt   $ 0 $ 30,000,000  
Senior Credit Facility        
Line of Credit Facility [Line Items]        
Letters of credit outstanding   62,400,000   $ 88,500,000
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Revolving credit facility   0   0
Line of credit facility, current borrowing capacity   $ 722,200,000   $ 711,500,000
Revolving Credit Facility | New Credit Agreement        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity $ 800,000,000.0      
Revolving Credit Facility | New Senior Credit Facility        
Line of Credit Facility [Line Items]        
Maximum increase in borrowing capacity 400,000,000.0      
Line of credit, commitment fee (as a percentage)   0.20%    
Letter of Credit | New Senior Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity 750,000,000.0      
Swing Line Loans | New Senior Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity $ 30,000,000.0      
LIBOR | Revolving Credit Facility | New Senior Credit Facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 1.375%      
Base Rate | Revolving Credit Facility | New Senior Credit Facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 0.375%      
Minimum | Revolving Credit Facility | New Senior Credit Facility        
Line of Credit Facility [Line Items]        
Commitment fee percentage for unused capacity 0.09%      
Minimum | LIBOR | Revolving Credit Facility | New Senior Credit Facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 1.00%      
Minimum | Base Rate | Revolving Credit Facility | New Senior Credit Facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 0.00%      
Maximum | Revolving Credit Facility | New Senior Credit Facility        
Line of Credit Facility [Line Items]        
Commitment fee percentage for unused capacity 0.30%      
Maximum | LIBOR | Revolving Credit Facility | New Senior Credit Facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 1.75%      
Maximum | Base Rate | Revolving Credit Facility | New Senior Credit Facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 0.75%