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Long-Term Debt (Senior Credit Facilities - Narrative) (Details) - USD ($)
3 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Debt Instrument [Line Items]    
Payments on Revolving Facility $ 250,000,000  
Letters of credit 5,016,000 $ 5,118,000
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Payments on Revolving Facility 250,000,000  
Maximum borrowing capacity $ 785,000,000  
Maturity date Jul. 03, 2024  
Remaining borrowing capacity $ 779,984,000 $ 529,882,000