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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total current portion of long-term debt $ 300,000 $ 70,000
Total notes 1,548,352 1,548,208
Long-term credit agreements 225,000 490,000
Debt issuance costs (contra) (11,058) (12,302)
Total long-term debt less unamortized discount and debt issuance costs 1,762,294 2,025,906
Current portion of long-term debt 300,000 70,000
Total debt 2,062,294 2,095,906
5-year Term-Loan Facility Expires in 2022    
Debt Instrument [Line Items]    
Total current portion of long-term debt 270,000 40,000
Long-term credit agreements   250,000
5-year Term-Loan Facility Expires in 2023    
Debt Instrument [Line Items]    
Total current portion of long-term debt 30,000 30,000
Long-term credit agreements 225,000 240,000
4.200% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2024    
Debt Instrument [Line Items]    
Total notes 499,495 499,416
4.500% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2029    
Debt Instrument [Line Items]    
Total notes 349,569 349,540
2.375% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2031    
Debt Instrument [Line Items]    
Total notes $ 699,288 $ 699,252