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Quarterly Financial Data (unaudited) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 16, 2015
Nov. 16, 2015
Oct. 15, 2015
Sep. 15, 2015
Aug. 17, 2015
Jul. 15, 2015
Jun. 15, 2015
May. 15, 2015
Apr. 15, 2015
Mar. 13, 2015
Feb. 13, 2015
Jan. 15, 2015
Dec. 15, 2014
Nov. 17, 2014
Oct. 15, 2014
Sep. 15, 2014
Aug. 15, 2014
Jul. 15, 2014
Jun. 16, 2014
May. 15, 2014
Apr. 15, 2014
Mar. 17, 2014
Feb. 14, 2014
Jan. 15, 2014
Dec. 16, 2013
Nov. 15, 2013
Oct. 15, 2013
Sep. 16, 2013
Aug. 15, 2013
Jul. 15, 2013
Jun. 14, 2013
May. 15, 2013
Apr. 15, 2013
Mar. 15, 2013
Feb. 15, 2013
Jan. 15, 2013
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                                                                                              
Interest income, net of premium amortization                                                                         $ 88,405 $ 85,643 $ 91,702 $ 99,550 $ 106,472 $ 107,481 $ 113,892 $ 123,082 $ 365,300 $ 450,927 $ 505,443
Interest expense- repurchase agreements                                                                         (16,739) (14,430) (13,917) (14,192) (14,830) (15,006) (14,979) (14,747) (59,278) (59,562) (83,113)
Interest expense- U.S. Treasury Securities sold short                                                                                 (1,128) (160) (4,263) 0 0 (5,551) (1,437)
Net Interest Income                                                                         71,666 71,213 77,785 85,358 90,514 92,315 94,650 108,335 306,022 385,814 420,893
Realized gain (loss) on sale of Agency Securities (reclassified from Other comprehensive income (loss))                                                                         (13,108) 69 (5,051) 6,544 124 (12,390) 11,167 69,869 (11,546) 68,770 (593,498)
Gain (loss) on short sale of U.S. Treasury Securities                                                                                 (1,993) 3,086 (15,781) 0 0 (14,688) 15,508
Realized loss on derivatives                                                                         (37,791) (17,400) (59,978) 8,099 (37,824) (34,655) (34,498) (11,739) (107,070) [1] (118,716) [1] (135,908) [1]
Unrealized gain (loss) on derivatives                                                                         106,243 (266,074) 194,507 (216,338) (184,710) 14,708 (116,273) (176,355) (181,662) (462,630) 544,643
Expenses                                                                         (9,211) (9,360) (9,246) (9,132) (9,283) (8,972) (9,455) (9,888) (36,949) (37,598) (37,151)
Net Income (Loss)                                                                         117,799 (221,552) 198,017 (125,469) (143,172) 54,092 (70,190) (19,778) (31,205) (179,048) (187,044)
Dividends declared on preferred stock                                                                         (3,907) (3,905) (3,905) (3,905) (3,905) (3,905) (3,905) (3,905) (15,622) (15,620) (14,213)
Net Income (Loss) related to common stockholders                                                                         $ 113,892 $ (225,457) $ 194,112 $ (129,374) $ (147,077) $ 50,187 $ (74,095) $ (23,683) $ (46,827) $ (194,668) $ (201,257)
Net income (loss) available (related) per share to common stockholders - Basic (in dollars per share)                                                                         $ 2.88 $ (5.18) $ 4.42 $ (2.93) $ (3.29) $ 1.12 $ (1.68) $ (0.56) $ (1.09) $ (4.32) $ (4.40)
Net income (loss) available (related) per share to common stockholders - Diluted (in dollars per share)                                                                         2.87 (5.18) 4.41 (2.93) (3.29) 1.12 (1.68) (0.56) (1.09) (4.32) (4.40)
Dividends declared per common share (in dollars per share) $ 0.33 $ 0.33 $ 0.33 $ 0.33 $ 0.33 $ 0.32 $ 0.32 $ 0.32 $ 0.32 $ 0.32 $ 0.32 $ 0.32 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 0.56 $ 0.56 $ 0.56 $ 0.56 $ 0.56 $ 0.56 $ 0.64 $ 0.64 $ 0.64 $ 0.99 $ 0.98 $ 0.96 $ 0.96 $ 1.20 $ 1.20 $ 1.20 $ 1.20 $ 3.89 $ 4.80 $ 6.48
Weighted average common shares outstanding – basic (in shares)                                                                         39,567 43,561 43,916 44,118 44,642 44,650 44,639 44,687 42,780 44,654 45,354
Weighted average common shares outstanding - diluted (in shares)                                                                         39,645 43,561 44,022 44,118 44,642 44,795 44,639 44,687 42,780 44,654 45,354
[1] Interest expense related to our interest rate swap contracts is recorded as realized loss on derivatives on the consolidated statements of operations. For additional information, see Note 8 to the consolidated financial statements.