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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