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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total current portion of long-term debt $ 62,500 $ 55,000
Total notes 848,850 848,743
Long-term credit agreements 725,000 660,000
Debt issuance costs (contra) (7,441) (8,400)
Total long-term debt less unamortized discount and debt issuance costs 1,566,409 1,500,343
Current portion of long-term debt 62,500 55,000
Total debt 1,628,909 1,555,343
5-year Term-Loan Facility Expires in 2022    
Debt Instrument [Line Items]    
Total current portion of long-term debt 40,000 40,000
Long-term credit agreements 270,000 290,000
5-year Term-Loan Facility Expires in 2023    
Debt Instrument [Line Items]    
Total current portion of long-term debt 22,500 15,000
Long-term credit agreements 255,000 270,000
4.200% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2024    
Debt Instrument [Line Items]    
Total notes 499,337 499,259
4.500% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2029    
Debt Instrument [Line Items]    
Total notes 349,513 349,484
5-year Revolving-Loan Facility, Periodic Interest Payments, LIBOR Plus up to 1.500%, Plus Commitment Fees up to 0.250%, Expires June 28, 2022    
Debt Instrument [Line Items]    
Long-term credit agreements $ 200,000 $ 100,000