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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total current portion of long-term debt $ 55,000 $ 50,000
Total notes 848,743 499,101
Long-term credit agreements 660,000 965,000
Debt issuance costs (contra) (8,400) (7,111)
Total long-term debt less unamortized discount and debt issuance costs 1,500,343 1,456,990
Current portion of long-term debt 55,000 50,000
Total debt 1,555,343 1,506,990
5-year Term-Loan Facility Expires in 2022    
Debt Instrument [Line Items]    
Total current portion of long-term debt 40,000 35,000
Long-term credit agreements 290,000 330,000
5-year Term-Loan Facility Expires in 2023    
Debt Instrument [Line Items]    
Total current portion of long-term debt 15,000 15,000
Long-term credit agreements 270,000 285,000
4.200% Senior Notes, Semi-Annual Interest Payments, Balloon Due 2024    
Debt Instrument [Line Items]    
Total notes 499,259 499,101
4.500% Senior Notes, Semi-Annual Interest Payments, Balloon Due 2029    
Debt Instrument [Line Items]    
Total notes 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 $ 100,000 $ 350,000