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Financing (Outstanding Financing Facilities) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 25, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing |  |  |  |
Principal amount of long-term debt | $ 4,494,000 |  | $ 3,911,000 |
Less: Unamortized discount and debt issuance costs | 22,752 |  | 20,473 |
Long-term debt | 4,471,248 |  | 3,890,527 | [1]
4.875% Senior Notes due 2021 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, principal amount | $ 500,000 |  | 500,000 |
Interest rate of senior notes | 4.875% |  |  |
Senior notes, effective interest rate | 4.948% |  |  |
4.625% Senior Notes due 2021 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, principal amount | $ 300,000 |  | 300,000 |
Interest rate of senior notes | 4.625% |  |  |
Senior notes, effective interest rate | 4.644% |  |  |
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% |  | 3.845% |
3.850% Senior Notes due 2023 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, principal amount | $ 300,000 |  | $ 300,000 |
Interest rate of senior notes | 3.85% |  |  |
Senior notes, effective interest rate | 3.851% |  |  |
3.550% Senior Notes due 2026 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, principal amount | $ 500,000 |  | 500,000 |
Interest rate of senior notes | 3.55% |  |  |
Senior notes, effective interest rate | 3.57% |  |  |
3.600% Senior Notes due 2027 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, principal amount | $ 750,000 |  | 750,000 |
Interest rate of senior notes | 3.60% |  |  |
Senior notes, effective interest rate | 3.619% |  |  |
4.350% Senior Notes due 2028 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, principal amount | $ 500,000 |  | 500,000 |
Interest rate of senior notes | 4.35% |  |  |
Senior notes, effective interest rate | 4.383% |  |  |
3.900% Senior Notes due 2029 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, principal amount | $ 500,000 |  | 500,000 |
Interest rate of senior notes | 3.90% |  |  |
Senior notes, effective interest rate | 3.901% |  |  |
4.200% Senior Notes due 2030 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, principal amount | $ 500,000 | $ 500,000 |  |
Interest rate of senior notes | 4.20% | 4.20% |  |
Senior notes, effective interest rate | 4.205% |  |  |
Revolving Credit Facility [Member] |  |  |  |
Financing |  |  |  |
Unsecured revolving credit facility | $ 344,000 |  | $ 261,000 |
Unsecured revolving credit facility, weighted-average variable interest rate | 2.213% |  |  |
Senior notes [Member] | Minimum [Member] |  |  |  |
Financing |  |  |  |
Interest rate of senior notes | 3.55% |  |  |
Senior notes [Member] | Maximum [Member] |  |  |  |
Financing |  |  |  |
Interest rate of senior notes | 4.875% |  |  |
[1] | The balance sheet at December 31, 2019, has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by United States generally accepted accounting principles for complete financial statements.

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