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Debt (Narrative) (Details) - USD ($)
1 Months Ended 6 Months Ended
Jan. 31, 2019
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Current portion of long-term debt   $ 45,988,000 $ 45,974,000
Letter of Credit [Member]      
Debt Instrument [Line Items]      
Line of credit facility, amount outstanding   1,000,000.0  
Maximum borrowing capacity   75,000,000.0  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity   380,000,000.0  
Amount available to increase borrowing capacity   420,000,000.0  
Swing Line Loans [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity   25,000,000.0  
Amended Term Loan Agreement [Member]      
Debt Instrument [Line Items]      
Line of credit facility, amount outstanding   $ 693,500,000  
London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.85% 2.15%