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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands | Total | Series C Preferred Stock | Series B Preferred Stock | Preferred Stock Series C Preferred Stock | Preferred Stock Series B Preferred Stock | Common Stock | Additional Paid-in Capital | Additional Paid-in Capital Series C Preferred Stock | Accumulated Deficit | Accumulated Deficit Series C Preferred Stock | Accumulated Deficit Series B Preferred Stock | Accumulated Other Comprehensive Income | Revision of Prior Period, Accounting Standards Update, Adjustment | Revision of Prior Period, Accounting Standards Update, Adjustment Accumulated Deficit
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Balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  | 0 | 8,000 | 452,369 |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2019 |  | $ 3,383,952 |  |  |  |  | $ 0 | $ 80 | $ 4,524 | $ 3,640,341 |  | $ (631,040) |  |  |  |  | $ 370,047 | $ (8,326) | $ (8,326)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | (908,995) |  |  |  |  |  |  |  |  |  | (908,995) |  |  |  |  |  |  |
Issuance of stock, net of expenses (in shares) |  |  |  |  |  |  | 11,000 |  | 1,106 |  |  |  |  |  |  |  |  |  |
Issuance of stock, net of expenses |  | 687 | $ 266,029 |  |  |  | $ 110 |  | $ 7 | 680 | $ 265,919 |  |  |  |  |  |  |  |
Repurchase of shares of common stock (in shares) | [1] |  |  |  |  |  |  |  | (337) |  |  |  |  |  |  |  |  |  |
Repurchase of shares of common stock | [1] | (2,652) |  |  |  |  |  |  |  | (2,652) |  |  |  |  |  |  |  |  |
Equity based compensation expense |  | 1,266 |  |  |  |  |  |  |  | 1,266 |  |  |  |  |  |  |  |  |
Change in accrued dividends attributable to stock-based awards |  | 1,059 |  |  |  |  |  |  |  | 1,059 |  |  |  |  |  |  |  |  |
Change in unrealized gains on securities, net |  | (243,812) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (243,812) |  |
Derivative hedging instrument fair value changes and amortization, net |  | (48,533) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (48,533) |  |
Balance (in shares) at Mar. 31, 2020 |  |  |  |  |  |  | 11,000 | 8,000 | 453,138 |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2020 |  | 2,440,675 |  |  |  |  | $ 110 | $ 80 | $ 4,531 | 3,906,613 |  | (1,548,361) |  |  |  |  | 77,702 |  |
Balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  | 0 | 8,000 | 452,369 |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2019 |  | 3,383,952 |  |  |  |  | $ 0 | $ 80 | $ 4,524 | 3,640,341 |  | (631,040) |  |  |  |  | 370,047 | $ (8,326) | $ (8,326)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | (725,207) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared on preferred stock |  | (21,578) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Changes in fair value of financing agreements at fair value due to changes in instrument-specific credit risk |  | (22,652) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance (in shares) at Sep. 30, 2020 |  |  |  |  |  |  | 11,000 | 8,000 | 453,333 |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2020 |  | 2,565,656 |  |  |  |  | $ 110 | $ 80 | $ 4,533 | 3,924,584 |  | (1,408,910) |  |  |  |  | 45,259 |  |
Balance (in shares) at Mar. 31, 2020 |  |  |  |  |  |  | 11,000 | 8,000 | 453,138 |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2020 |  | 2,440,675 |  |  |  |  | $ 110 | $ 80 | $ 4,531 | 3,906,613 |  | (1,548,361) |  |  |  |  | 77,702 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | 96,578 |  |  |  |  |  |  |  |  |  | 96,578 |  |  |  |  |  |  |
Issuance of stock, net of expenses (in shares) |  |  |  |  |  |  |  |  | 106 |  |  |  |  |  |  |  |  |  |
Issuance of stock, net of expenses |  | 37 |  |  |  |  |  |  | $ 1 | 36 |  |  |  |  |  |  |  |  |
Equity based compensation expense |  | 1,709 |  |  |  |  |  |  |  | 1,709 |  |  |  |  |  |  |  |  |
Change in unrealized gains on securities, net |  | (96,021) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (96,021) |  |
Derivative hedging instrument fair value changes and amortization, net |  | 64,032 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64,032 |  |
Warrants Issued |  | 14,041 |  |  |  |  |  |  |  | 14,041 |  |  |  |  |  |  |  |  |
Balance (in shares) at Jun. 30, 2020 |  |  |  |  |  |  | 11,000 | 8,000 | 453,244 |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2020 |  | 2,521,051 |  |  |  |  | $ 110 | $ 80 | $ 4,532 | 3,922,399 |  | (1,451,783) |  |  |  |  | 45,713 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | 87,210 |  |  |  |  |  |  |  |  |  | 87,210 |  |  |  |  |  |  |
Issuance of stock, net of expenses (in shares) |  |  |  |  |  |  |  |  | 89 |  |  |  |  |  |  |  |  |  |
Issuance of stock, net of expenses |  | 1 |  |  |  |  |  |  | $ 1 | 0 |  |  |  |  |  |  |  |  |
Equity based compensation expense |  | 2,266 |  |  |  |  |  |  |  | 2,266 |  |  |  |  |  |  |  |  |
Change in accrued dividends attributable to stock-based awards |  | (81) |  |  |  |  |  |  |  | (81) |  |  |  |  |  |  |  |  |
Dividends declared on common stock |  | (22,667) |  |  |  |  |  |  |  |  |  | (22,667) |  |  |  |  |  |  |
Dividends declared on preferred stock |  | (8,219) | (10,328) | [2] | $ (11,250) | [2] |  |  |  |  |  |  | $ (10,328) | [2] | $ (11,250) | [2] |  |  |
Dividends attributable to dividend equivalents |  | (92) |  |  |  |  |  |  |  |  |  | (92) |  |  |  |  |  |  |
Change in unrealized gains on securities, net |  | 15,022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,022 |  |
Derivative hedging instrument fair value changes and amortization, net |  | 7,176 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,176 |  |
Changes in fair value of financing agreements at fair value due to changes in instrument-specific credit risk |  | (22,652) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (22,652) |  |
Balance (in shares) at Sep. 30, 2020 |  |  |  |  |  |  | 11,000 | 8,000 | 453,333 |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2020 |  | 2,565,656 |  |  |  |  | $ 110 | $ 80 | $ 4,533 | 3,924,584 |  | (1,408,910) |  |  |  |  | 45,259 |  |
Balance (in shares) at Dec. 31, 2020 |  |  |  |  |  |  | 11,000 | 8,000 | 451,714 |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2020 |  | 2,524,802 |  |  |  |  | $ 110 | $ 80 | $ 4,517 | 3,848,129 |  | (1,405,327) |  |  |  |  | 77,293 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | 85,522 |  |  |  |  |  |  |  |  |  | 85,522 |  |  |  |  |  |  |
Issuance of stock, net of expenses (in shares) |  |  |  |  |  |  |  |  | 559 |  |  |  |  |  |  |  |  |  |
Issuance of stock, net of expenses |  | 382 |  |  |  |  |  |  | $ 6 | 376 |  |  |  |  |  |  |  |  |
Repurchase of shares of common stock (in shares) | [3] |  |  |  |  |  |  |  | (6,159) |  |  |  |  |  |  |  |  |  |
Repurchase of shares of common stock | [3] | (25,136) |  |  |  |  |  |  | $ (62) | (25,074) |  |  |  |  |  |  |  |  |
Equity based compensation expense |  | 1,686 |  |  |  |  |  |  |  | 1,686 |  |  |  |  |  |  |  |  |
Change in accrued dividends attributable to stock-based awards |  | 489 |  |  |  |  |  |  |  | 489 |  |  |  |  |  |  |  |  |
Dividends declared on common stock |  | (33,521) |  |  |  |  |  |  |  |  |  | (33,521) |  |  |  |  |  |  |
Dividends declared on preferred stock |  |  | (4,468) |  | (3,750) |  |  |  |  |  |  |  | (4,468) |  | (3,750) |  |  |  |
Dividends attributable to dividend equivalents |  | (120) |  |  |  |  |  |  |  |  |  | (120) |  |  |  |  |  |  |
Change in unrealized gains on securities, net |  | (3,855) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,855) |  |
Changes in fair value of financing agreements at fair value due to changes in instrument-specific credit risk |  | 235 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 235 |  |
Balance (in shares) at Mar. 31, 2021 |  |  |  |  |  |  | 11,000 | 8,000 | 446,114 |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2021 |  | 2,542,266 |  |  |  |  | $ 110 | $ 80 | $ 4,461 | 3,825,606 |  | (1,361,664) |  |  |  |  | 73,673 |  |
Balance (in shares) at Dec. 31, 2020 |  |  |  |  |  |  | 11,000 | 8,000 | 451,714 |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2020 |  | 2,524,802 |  |  |  |  | $ 110 | $ 80 | $ 4,517 | 3,848,129 |  | (1,405,327) |  |  |  |  | 77,293 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | 284,747 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared on preferred stock |  | (24,656) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Changes in fair value of financing agreements at fair value due to changes in instrument-specific credit risk |  | 935 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance (in shares) at Sep. 30, 2021 |  |  |  |  |  |  | 11,000 | 8,000 | 440,927 |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2021 |  | 2,601,087 |  |  |  |  | $ 110 | $ 80 | $ 4,409 | 3,807,237 |  | (1,267,504) |  |  |  |  | 56,755 |  |
Balance (in shares) at Mar. 31, 2021 |  |  |  |  |  |  | 11,000 | 8,000 | 446,114 |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2021 |  | 2,542,266 |  |  |  |  | $ 110 | $ 80 | $ 4,461 | 3,825,606 |  | (1,361,664) |  |  |  |  | 73,673 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | 66,714 |  |  |  |  |  |  |  |  |  | 66,714 |  |  |  |  |  |  |
Issuance of stock, net of expenses (in shares) |  |  |  |  |  |  |  |  | 358 |  |  |  |  |  |  |  |  |  |
Issuance of stock, net of expenses |  | 398 |  |  |  |  |  |  | $ 4 | 394 |  |  |  |  |  |  |  |  |
Repurchase of shares of common stock (in shares) | [3] |  |  |  |  |  |  |  | (5,660) |  |  |  |  |  |  |  |  |  |
Repurchase of shares of common stock | [3] | (23,741) |  |  |  |  |  |  | $ (57) | (23,684) |  |  |  |  |  |  |  |  |
Equity based compensation expense |  | 2,741 |  |  |  |  |  |  |  | 2,741 |  |  |  |  |  |  |  |  |
Change in accrued dividends attributable to stock-based awards |  | (288) |  |  |  |  |  |  |  | (227) |  | (61) |  |  |  |  |  |  |
Dividends declared on common stock |  | (44,081) |  |  |  |  |  |  |  |  |  | (44,081) |  |  |  |  |  |  |
Dividends declared on preferred stock |  |  | (4,469) |  | (3,750) |  |  |  |  |  |  |  | (4,469) |  | (3,750) |  |  |  |
Dividends attributable to dividend equivalents |  | (155) |  |  |  |  |  |  |  |  |  | (155) |  |  |  |  |  |  |
Change in unrealized gains on securities, net |  | (9,589) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,589) |  |
Changes in fair value of financing agreements at fair value due to changes in instrument-specific credit risk |  | 491 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 491 |  |
Balance (in shares) at Jun. 30, 2021 |  |  |  |  |  |  | 11,000 | 8,000 | 440,812 |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2021 |  | 2,526,537 |  |  |  |  | $ 110 | $ 80 | $ 4,408 | 3,804,830 |  | (1,347,466) |  |  |  |  | 64,575 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | 132,511 |  |  |  |  |  |  |  |  |  | 132,511 |  |  |  |  |  |  |
Issuance of stock, net of expenses (in shares) |  |  |  |  |  |  |  |  | 115 |  |  |  |  |  |  |  |  |  |
Issuance of stock, net of expenses |  | 525 |  |  |  |  |  |  | $ 1 | 524 |  |  |  |  |  |  |  |  |
Equity based compensation expense |  | 2,306 |  |  |  |  |  |  |  | 2,306 |  |  |  |  |  |  |  |  |
Change in accrued dividends attributable to stock-based awards |  | (505) |  |  |  |  |  |  |  | (423) |  | (82) |  |  |  |  |  |  |
Dividends declared on common stock |  | (44,093) |  |  |  |  |  |  |  |  |  | (44,093) |  |  |  |  |  |  |
Dividends declared on preferred stock |  | (8,218) | $ (4,469) |  | $ (3,750) |  |  |  |  |  |  |  | $ (4,469) |  | $ (3,750) |  |  |  |
Dividends attributable to dividend equivalents |  | (155) |  |  |  |  |  |  |  |  |  | (155) |  |  |  |  |  |  |
Change in unrealized gains on securities, net |  | (8,029) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,029) |  |
Changes in fair value of financing agreements at fair value due to changes in instrument-specific credit risk |  | 209 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 209 |  |
Balance (in shares) at Sep. 30, 2021 |  |  |  |  |  |  | 11,000 | 8,000 | 440,927 |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2021 |  | $ 2,601,087 |  |  |  |  | $ 110 | $ 80 | $ 4,409 | $ 3,807,237 |  | $ (1,267,504) |  |  |  |  | $ 56,755 |  |
[1] | For the nine months ended September 30, 2020, includes approximately $2.7 million (337,026 shares) surrendered for tax purposes related to equity-based compensation awards.
[2] | Includes reinstated dividends that were unpaid through June 30, 2020, and were paid during the three months ended September 30, 2020.
[3] | For the nine months ended September 30, 2021 includes approximately $799,000 (213,123 shares) surrendered for tax purposes related to equity-based compensation awards.

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