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Financing (Outstanding Financing Facilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Oct. 14, 2020 | Sep. 23, 2020 | Mar. 27, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
Financing |  |  |  |  |
Total principal amount of debt | $ 4,150,000 |  |  |  | $ 3,911,000
Less: Unamortized discount and debt issuance costs | 26,783 |  |  |  | 20,473
Senior notes, unamortized discount | 5,100 |  |  |  | 3,500
Senior notes, unamortized debt issuance costs | 22,300 |  |  |  | 18,000
Total long-term debt | 4,123,217 |  |  |  | 3,890,527
4.875% Senior Notes due 2021 [Member] |  |  |  |  |
Financing |  |  |  |  |
Senior notes, principal amount |  | $ 500,000 |  |  |
4.200% Senior Notes due 2030 [Member] |  |  |  |  |
Financing |  |  |  |  |
Senior notes, principal amount |  |  |  | $ 500,000 |
Interest rate of senior notes |  |  |  | 4.20% |
1.750% Senior Notes due 2031 [Member] |  |  |  |  |
Financing |  |  |  |  |
Senior notes, principal amount |  |  | $ 500,000 |  |
Interest rate of senior notes |  |  | 1.75% |  |
Revolving Credit Facility [Member] |  |  |  |  |
Financing |  |  |  |  |
Unsecured revolving credit facility | 0 |  |  |  | 261,000
Senior notes [Member] |  |  |  |  |
Financing |  |  |  |  |
Senior notes, principal amount | 4,200,000 |  |  |  |
Senior notes [Member] | 4.875% Senior Notes due 2021 [Member] |  |  |  |  |
Financing |  |  |  |  |
Senior notes, principal amount | $ 0 |  |  |  | $ 500,000
Interest rate of senior notes |  |  |  |  | 4.875%
Senior notes [Member] | 4.625% Senior Notes due 2021 [Member] |  |  |  |  |
Financing |  |  |  |  |
Interest rate of senior notes | 4.625% |  |  |  | 4.625%
Senior notes, effective interest rate | 4.643% |  |  |  |
Senior notes [Member] | 3.800% Senior Notes due 2022 [Member] |  |  |  |  |
Financing |  |  |  |  |
Senior notes, principal amount | $ 300,000 |  |  |  | $ 300,000
Interest rate of senior notes | 3.80% |  |  |  | 3.80%
Senior notes, effective interest rate | 3.845% |  |  |  |
Senior notes [Member] | 3.850% Senior Notes due 2023 [Member] |  |  |  |  |
Financing |  |  |  |  |
Senior notes, principal amount | $ 300,000 |  |  |  | $ 300,000
Interest rate of senior notes | 3.85% |  |  |  | 3.85%
Senior notes, effective interest rate | 3.851% |  |  |  |
Senior notes [Member] | 3.550% Senior Notes due 2026 [Member] |  |  |  |  |
Financing |  |  |  |  |
Senior notes, principal amount | $ 500,000 |  |  |  | $ 500,000
Interest rate of senior notes | 3.55% |  |  |  | 3.55%
Senior notes, effective interest rate | 3.57% |  |  |  |
Senior notes [Member] | 3.600% Senior Notes due 2027 [Member] |  |  |  |  |
Financing |  |  |  |  |
Senior notes, principal amount | $ 750,000 |  |  |  | $ 750,000
Interest rate of senior notes | 3.60% |  |  |  | 3.60%
Senior notes, effective interest rate | 3.619% |  |  |  |
Senior notes [Member] | 4.350% Senior Notes due 2028 [Member] |  |  |  |  |
Financing |  |  |  |  |
Senior notes, principal amount | $ 500,000 |  |  |  | $ 500,000
Interest rate of senior notes | 4.35% |  |  |  | 4.35%
Senior notes, effective interest rate | 4.383% |  |  |  |
Senior notes [Member] | 3.900% Senior Notes due 2029 [Member] |  |  |  |  |
Financing |  |  |  |  |
Senior notes, principal amount | $ 500,000 |  |  |  | $ 500,000
Interest rate of senior notes | 3.90% |  |  |  | 3.90%
Senior notes, effective interest rate | 3.901% |  |  |  |
Senior notes [Member] | 4.200% Senior Notes due 2030 [Member] |  |  |  |  |
Financing |  |  |  |  |
Senior notes, principal amount | $ 500,000 |  |  |  | $ 0
Interest rate of senior notes | 4.20% |  |  |  |
Senior notes, effective interest rate | 4.205% |  |  |  |
Senior notes [Member] | 1.750% Senior Notes due 2031 [Member] |  |  |  |  |
Financing |  |  |  |  |
Senior notes, principal amount | $ 500,000 |  |  |  | $ 0
Interest rate of senior notes | 1.75% |  |  |  |
Senior notes, effective interest rate | 1.798% |  |  |  |

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