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Long-Term Debt (Refinanced Credit Agreement (Term Loan due 2026)) (Details) - USD ($)
Sep. 26, 2019
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Long-term line of credit   $ 60,000,000 $ 0
Term Loan Due 2026      
Debt Instrument [Line Items]      
Long-term line of credit $ 525,000,000.0    
Basis spread on variable rate 1.00%    
Amortization of outstanding loan principal amount, quarterly installment 0.25%    
Premium for refinancing or repricing transactions prior to March 26, 2020   1.00%  
Debt discounts and issuance costs   $ 5,100,000  
Term Loan Due 2026 | London Interbank Offered Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.75%    
Term Loan Due 2026 | London Interbank Offered Rate | Minimum      
Debt Instrument [Line Items]      
Interest rate 1.00%    
Term Loan Due 2026 | Alternative Base Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.75%    
Term Loan Due 2026 | Alternative Base Rate | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.00%