Preferred Stock, Common Stock and Other Stockholders' Equity - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 22, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclassifications out of accumulated other comprehensive income (loss):
Interest expense		$ (155,411)	$ (114,703)	$ (108,034)
Income tax expense		140,967	(91,942)	(95,855)
Net income		(382,092)	219,818	316,003
Reclassification out of Accumulated Other Comprehensive Income
Reclassifications out of accumulated other comprehensive income (loss):
Interest expense	$ (14,900)
Net income		3,505	(173)	536
Reclassification out of Accumulated Other Comprehensive Income | Amortization of loss on interest rate hedge
Reclassifications out of accumulated other comprehensive income (loss):
Interest expense		3,685	(1,046)
Income tax expense		(917)	276
Net income		2,768	(770)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of deferred actuarial loss and prior service cost
Reclassifications out of accumulated other comprehensive income (loss):
Operating expenses		985	795	721
Income tax expense		(248)	(198)	(185)
Net income		$ 737	$ 597	$ 536