CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands		Total	Preferred Stock Series B Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Balance (in shares) at Dec. 31, 2016			8,000	371,854
Beginning balance at Dec. 31, 2016		$ 3,033,902	$ 80	$ 3,719	$ 3,029,062	$ (572,641)	$ 573,682
Increase (Decrease) in Stockholders' Equity
Net income		322,393				322,393
Issuance of common stock, net of expenses (in shares)				26,722
Issuance of common stock, net of expenses		196,808		$ 259	196,549
Repurchase of shares of common stock (in shares)	[1]			(745)
Repurchase of shares of common stock	[1]	(5,995)		$ 0	(5,995)
Equity based compensation expense		7,872			7,872
Accrued dividends attributable to stock-based awards		(184)			(184)
Dividends declared on common stock ($0.80 per share)		(312,810)				(312,810)
Dividends declared on preferred stock ($1.875 per share)		(15,000)				(15,000)
Dividends attributable to dividend equivalents		(892)				(892)
Change in unrealized losses on MBS, net		245					245
Derivative hedging instruments fair value changes, net		35,297					35,297
Balance (in shares) at Dec. 31, 2017			8,000	397,831
Ending balance at Dec. 31, 2017		3,261,636	$ 80	$ 3,978	3,227,304	(578,950)	609,224
Increase (Decrease) in Stockholders' Equity
Net income		301,801				301,801
Issuance of common stock, net of expenses (in shares)				52,420
Issuance of common stock, net of expenses		392,145		$ 520	391,625
Repurchase of shares of common stock (in shares)	[1]			(464)
Repurchase of shares of common stock	[1]	(3,392)			(3,392)
Equity based compensation expense		7,999			7,999
Accrued dividends attributable to stock-based awards		(261)			(261)
Dividends declared on common stock ($0.80 per share)		(339,244)				(339,244)
Dividends declared on preferred stock ($1.875 per share)		(15,000)				(15,000)
Dividends attributable to dividend equivalents		(942)				(942)
Change in unrealized losses on MBS, net		(203,481)					(203,481)
Derivative hedging instruments fair value changes, net		14,545					14,545
Balance (in shares) at Dec. 31, 2018			8,000	449,787
Ending balance at Dec. 31, 2018		3,416,101	$ 80	$ 4,498	3,623,275	(632,040)	420,288
Increase (Decrease) in Stockholders' Equity
Net income		378,117				378,117
Issuance of common stock, net of expenses (in shares)				3,145
Issuance of common stock, net of expenses		12,325		$ 26	12,299
Repurchase of shares of common stock (in shares)	[1]			(563)
Repurchase of shares of common stock	[1]	(4,118)			(4,118)
Equity based compensation expense		9,230			9,230
Accrued dividends attributable to stock-based awards		(345)			(345)
Dividends declared on common stock ($0.80 per share)		(361,033)				(361,033)
Dividends declared on preferred stock ($1.875 per share)		(15,000)				(15,000)
Dividends attributable to dividend equivalents		(1,084)				(1,084)
Change in unrealized losses on MBS, net		(24,445)					(24,445)
Derivative hedging instruments fair value changes, net		(25,796)					(25,796)
Balance (in shares) at Dec. 31, 2019			8,000	452,369
Ending balance at Dec. 31, 2019		$ 3,383,952	$ 80	$ 4,524	$ 3,640,341	$ (631,040)	$ 370,047

[1] For the year ended December 31, 2019, includes approximately $4.1 million (562,815 shares) surrendered for tax purposes related to equity-based compensation awards. For the year ended December 31, 2018, includes approximately $3.4 million (464,429 shares) surrendered for tax purposes related to equity-based compensation awards. For the year ended December 31, 2017, includes approximately $6.0 million (744,588 shares) surrendered for tax purposes related to equity-based compensation awards.