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Business Combination - Bargain Purchase Gain (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ 34,322 | $ 57,208 | $ 26,925 | $ 37,815 | $ 49,716 | $ 60,583 | $ 4,478 | $ 12,801 | $ 156,270 | $ 127,581 | $ 91,372
Common shares outstanding (in shares) | 107,121,235 |  |  |  | 91,422,676 |  |  |  | 107,121,235 | 91,422,676 |
Net income per common share, basic and diluted (in dollars per share) | $ 0.32 | $ 0.54 | $ 0.28 | $ 0.41 | $ 0.60 | $ 0.83 | $ 0.06 | $ 0.18 | $ 1.54 | $ 1.74 | $ 1.54
Apollo Residential Mortgage, Inc. Merger [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | $ 349,948 | $ 352,264
Net income available to common stockholders |  |  |  |  |  |  |  |  |  | $ 89,877 | $ 44,547
Common shares outstanding (in shares) |  |  |  |  | 91,422,676 |  |  |  |  | 91,422,676 | 67,195,252
Net income per common share, basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.98 | $ 0.66

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