Preferred Stock, Common Stock and Other Stockholders' Equity - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassifications out of accumulated other comprehensive income (loss):
Interest expense	$ (114,703)	$ (108,034)	$ (99,766)
Income tax expense	(91,942)	(95,855)	(16,026)
Net income	219,818	316,003	313,026
Reclassification out of Accumulated Other Comprehensive Income
Reclassifications out of accumulated other comprehensive income (loss):
Net income	(173)	536	1,096
Reclassification out of Accumulated Other Comprehensive Income | Amortization of loss on interest rate hedge
Reclassifications out of accumulated other comprehensive income (loss):
Interest expense	(1,046)		769
Income tax expense	276		(279)
Net income	(770)		490
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	795	721	865
Income tax expense	(198)	(185)	(259)
Net income	$ 597	$ 536	$ 606