CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 2018 |
Dec. 31, 2017 |
|
| Assets | ||
| Residential mortgage investments pledged | $ 12,590,000 | $ 12,980,000 |
| Stockholders’ equity | ||
| Preferred stock, par value (in dollars per share) | $ 0.10 | $ 0.10 |
| Preferred stock, shares authorized (in shares) | 100,000 | 100,000 |
| Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Common stock, shares authorized (in shares) | 250,000 | 250,000 |
| Common stock, shares issued (in shares) | 92,494 | 95,698 |
| Common stock, shares outstanding (in shares) | 92,494 | 95,698 |
| Cumulative Redeemable Preferred Stock, Series E [Member] | ||
| Stockholders’ equity | ||
| Preferred stock, shares issued (in shares) | 10,329 | 10,329 |
| Preferred stock, shares outstanding (in shares) | 10,329 | 10,329 |
| Preferred stock, dividend rate | 7.50% | 7.50% |
| Preferred stock, aggregate liquidation preference | $ 258,226 | $ 258,226 |