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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Long-Term Debt
Long-Term Debt at December 31, 2020 and 2019 consisted of the following (in thousands):
 20202019
4.40% Senior Notes due 2020$— $500,000 
2.45% Senior Notes due 2020— 500,000 
4.100% Senior Notes due 2021750,000 750,000 
2.625% Senior Notes due 20231,250,000 1,250,000 
3.15% Senior Notes due 2025500,000 500,000 
4.15% Senior Notes due 2026750,000 750,000 
6.65% Senior Notes due 2028140,000 140,000 
4.375% Senior Notes due 2030750,000 — 
3.90% Senior Notes due 2035500,000 500,000 
5.10% Senior Notes due 2036250,000 250,000 
4.950% Senior Notes due 2050750,000 — 
Long-Term Debt
5,640,000 5,140,000 
Finance Leases (see Note 18)212,217 57,900 
Less: Current Portion of Long-Term Debt781,054 1,014,524 
Unamortized Debt Discount30,931 19,528 
Debt Issuance Costs4,881 2,929 
Total Long-Term Debt$5,035,351 $4,160,919