Derivative Instruments Derivative Instruments - Changes in AOCI (net of tax) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of the period	$ 11,490,079	$ 9,396,772	$ 9,280,723	$ 2,191,354	$ 1,925,681	$ 1,248,599	$ 9,280,723	$ 1,248,599
Other Comprehensive Income (Loss), Net of Tax	(246,650)	48,195	19,838	10,436	(2,280)	(8,470)	(178,617)	(314)
Balance at end of the period	11,210,340	11,490,079	9,396,772	2,022,313	2,191,354	1,925,681	11,210,340	2,022,313
AOCI (net of tax) related to cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of the period	(2,205)	(2,416)	(3,756)	(5,922)	(5,668)	(2,778)	(3,756)	(2,778)
Other Comprehensive Income (Loss), Net of Tax	(299)	(403)	192	(66)	(1,109)	(3,160)
Balance at end of the period	(1,872)	(2,205)	(2,416)	(4,830)	(5,922)	(5,668)	$ (1,872)	$ (4,830)
AOCI (net of tax) related to cash flow hedges \| Amount reclassified out of Other comprehensive income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	$ 632	$ 614	$ 1,148	$ 1,158	$ 855	$ 270

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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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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+ Details