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ACQUISITION OF MTGE INVESTMENT CORP - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Sep. 07, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Preferred Stock, par value (in dollars per share) |  | $ 0.01 | $ 0.01
8.125% Series H Cumulative Redeemable Preferred Stock |  |  |
Business Acquisition [Line Items] |  |  |
Preferred stock dividend rate, percentage |  | 8.125% |
Mountain Merger Sub Corporation | Series A Preferred Stock |  |  |
Business Acquisition [Line Items] |  |  |
Preferred stock dividend rate, percentage | 8.125% |  |
Preferred Stock, par value (in dollars per share) | $ 0.01 |  |
Mountain Merger Sub Corporation |  |  |
Business Acquisition [Line Items] |  |  |
Total consideration | $ 906,200 |  |
Equity issued | 455,900 |  |
Cash | $ 450,287 |  |
Shares issued as part of the consideration for asset acquisition (in shares) | 43.6 |  |
Mountain Merger Sub Corporation | 8.125% Series H Cumulative Redeemable Preferred Stock |  |  |
Business Acquisition [Line Items] |  |  |
Preferred Stock, par value (in dollars per share) | $ 0.01 |  |

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