CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock Par Value	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Cumulative Earnings	Cumulative Distributions to Stockholders	Series A Preferred Stock Par Value	Series A Preferred Stock Par Value Preferred Stock	Series B Preferred Stock Par Value	Series B Preferred Stock Par Value Preferred Stock	Series C Preferred Stock Par Value	Series C Preferred Stock Par Value Preferred Stock	Series D Preferred Stock Par Value	Series D Preferred Stock Par Value Preferred Stock
Beginning Balance at Dec. 31, 2016	$ 3,123,533	$ 1,877	$ 3,508,779	$ 718,106	$ 2,443,184	$ (3,548,471)		$ 58		$ 0		$ 0		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	524,668				524,668
Other comprehensive income (loss)	78,796			78,796
Stock based compensation	3,614	1	3,613
Common dividends declared	(376,579)					(376,579)
Preferred dividends declared	(33,484)					(33,484)
Issuance of preferred stock	314,429		314,299							130
Ending Balance at Dec. 31, 2017	3,634,977	1,878	3,826,691	796,902	2,967,852	(3,958,534)		58		130		0		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	411,637				411,637
Other comprehensive income (loss)	(170,070)			(170,070)
Repurchase of common stock	(14,834)	(8)	(14,826)
Stock based compensation	8,797	1	8,796
Common dividends declared	(375,017)					(375,017)
Preferred dividends declared	(43,197)					(43,197)	$ (12,000)		$ (26,000)		$ (6,000)
Issuance of preferred stock	251,536		251,432									104
Ending Balance at Dec. 31, 2018	3,703,829	1,871	4,072,093	626,832	3,379,489	(4,376,748)		58		130		104		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	413,551				413,551
Other comprehensive income (loss)	81,504			81,504
Stock based compensation	10,584	2	10,582
Common dividends declared	(376,839)					(376,839)
Preferred dividends declared	(72,704)					(72,704)	$ (12,000)		$ (26,000)		$ (20,000)		$ (15,000)
Issuance of preferred stock	193,368		193,288											80
Ending Balance at Dec. 31, 2019	$ 3,953,293	$ 1,873	$ 4,275,963	$ 708,336	$ 3,793,040	$ (4,826,291)		$ 58		$ 130		$ 104		$ 80