Stockholders' Equity and EPS - Activity Related to Net Gains on Cash Flow Hedges in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cash flow hedge gains expected to reclassified out of AOCI over next 12 months	$ 63,500
Balance, beginning of period, net of tax	7,183,221	$ 5,483,823	$ 6,621,080	$ 5,264,843
Balance, end of period, net of tax	7,468,313	5,706,175	7,468,313	5,706,175
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period, net of tax	163,999	797	(2,130)	0
Net increase in fair value, net of tax	0	12,664	167,639	13,459
Net realized (gain) loss reclassified to net income, net of tax	(11,443)	367	(12,953)	369
Balance, end of period, net of tax	$ 152,556	$ 13,828	$ 152,556	$ 13,828