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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ 46,155 | $ 55,381 | $ 48,512 | $ 42,598 | $ 34,322 | $ 57,208 | $ 26,925 | $ 37,815 | $ 192,646 | $ 156,270 | $ 127,581
Common shares outstanding (in shares) | 133,853,565 |  |  |  | 107,121,235 |  |  |  | 133,853,565 | 107,121,235 |
Apollo Residential Mortgage, Inc. Merger [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  | 349,948
Net income available to common stockholders |  |  |  |  |  |  |  |  |  |  | $ 89,877
Common shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  | 91,422,676
Net income per common share, basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.98

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