Changes in Accumulated Other Comprehensive Income (Loss) (Changes by Component) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	$ 12,163,846	$ 11,105,461	$ 10,702,303
Other comprehensive (loss) income before reclassifications	(91,858)	(165,553)	(306,089)
Amounts reclassified from accumulated other comprehensive loss	150,230	(4,426)	12,620
Net current-period other comprehensive (loss) income	58,372	(169,979)	(293,469)
Balance	8,760,669	12,163,846	11,105,461
Changes related to cash flow derivative hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(688,529)	(537,216)	(250,355)
Other comprehensive (loss) income before reclassifications	(41,109)	(146,108)	(297,994)
Amounts reclassified from accumulated other comprehensive loss	79,119	(5,205)	11,133
Net current-period other comprehensive (loss) income	38,010	(151,313)	(286,861)
Balance	(650,519)	(688,529)	(537,216)
Changes in defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(45,558)	(26,023)	(33,666)
Other comprehensive (loss) income before reclassifications	(22,051)	(20,314)	6,156
Amounts reclassified from accumulated other comprehensive loss	2,067	779	1,487
Net current-period other comprehensive (loss) income	(19,984)	(19,535)	7,643
Balance	(65,542)	(45,558)	(26,023)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(63,626)	(64,495)	(50,244)
Other comprehensive (loss) income before reclassifications	(28,698)	869	(14,251)
Amounts reclassified from accumulated other comprehensive loss	69,044	0	0
Net current-period other comprehensive (loss) income	40,346	869	(14,251)
Balance	(23,280)	(63,626)	(64,495)
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(797,713)	(627,734)	(334,265)
Balance	$ (739,341)	$ (797,713)	$ (627,734)

Accumulated Other Comprehensive Income (Loss) [Roll Forward]

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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