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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total current portion of long-term debt $ 70,000 $ 55,000
Total notes 1,548,208 848,743
Long-term credit agreements 490,000 660,000
Debt issuance costs (contra) (12,302) (8,400)
Total long-term debt less unamortized discount and debt issuance costs 2,025,906 1,500,343
Current portion of long-term debt 70,000 55,000
Total debt 2,095,906 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 250,000 290,000
5-year Term-Loan Facility Expires in 2023    
Debt Instrument [Line Items]    
Total current portion of long-term debt 30,000 15,000
Long-term credit agreements 240,000 270,000
4.200% Senior Notes, Semi-Annual Interest Payments, Balloon Due 2024    
Debt Instrument [Line Items]    
Total notes 499,416 499,259
4.500% Senior Notes, Semi-Annual Interest Payments, Balloon Due 2029    
Debt Instrument [Line Items]    
Total notes 349,540 349,484
2.375% Senior Note due 2031, Semi-Annual Interest Payments, Balloon Due 2031    
Debt Instrument [Line Items]    
Total notes $ 699,252  
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