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Consolidated K-Series and Consolidated SLST - Condensed Statement of Operations of Consolidated K-Series (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense | $ 155,773 | $ 147,631 | $ 141,567 | $ 121,779 | $ 107,063 | $ 90,646 | $ 90,223 | $ 89,139 | $ 566,750 | $ 377,071 | $ 308,101
NET INTEREST INCOME | $ 43,999 | $ 31,971 | $ 25,691 | $ 26,203 | $ 21,873 | $ 19,603 | $ 17,500 | $ 19,752 | 127,864 | 78,728 | 57,986
NET INCOME |  |  |  |  |  |  |  |  | 172,896 | 104,795 | 88,567
Consolidated K-Series |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 535,226 | 358,712 | 297,124
Interest expense |  |  |  |  |  |  |  |  | 457,130 | 313,102 | 261,665
NET INTEREST INCOME |  |  |  |  |  |  |  |  | 78,096 | 45,610 | 35,459
Unrealized gains, net |  |  |  |  |  |  |  |  | 23,962 | 37,581 | 18,872
NET INCOME |  |  |  |  |  |  |  |  | 102,058 | $ 83,191 | $ 54,331
Consolidated SLST |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 4,764 |  |
Interest expense |  |  |  |  |  |  |  |  | 2,945 |  |
NET INTEREST INCOME |  |  |  |  |  |  |  |  | 1,819 |  |
Unrealized gains, net |  |  |  |  |  |  |  |  | (83) |  |
NET INCOME |  |  |  |  |  |  |  |  | $ 1,736 |  |

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