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Business Combination - Pro Forma Consolidated Operational Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |
Net income available to common stockholders | $ 37,815 | $ 12,801 |
Common stock, shares outstanding (in shares) | 91,621,274 |  | 91,422,676
Net income per common share, basic and diluted (in dollars per share) | $ 0.41 | $ 0.18 |
Apollo Residential Mortgage, Inc. Merger [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total revenue | $ 96,308 |  |
Net income available to common stockholders | $ (233) |  |
Common stock, shares outstanding (in shares) | 67,385,255,000 |  |
Net income per common share, basic and diluted (in dollars per share) | $ 0.00 |  |

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