Condensed Consolidated Statement of Operations (Parenthetical) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2018 |
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| Management Fee Expense, Rebates | $ 400 | $ 400 | $ 300 | $ 300 | ||||
| Management fee rebate | $ 1,380 | |||||||
| Interest Expense | 16,083 | 15,678 | 13,383 | 11,562 | 56,707 | [1] | ||
| Interest income | 35,694 | 35,300 | 31,941 | 28,092 | 131,027 | [1] | ||
| Consolidated Entities [Member] | ||||||||
| Interest Expense | 1,200 | 700 | 800 | 900 | 3,600 | |||
| Interest income | $ 2,100 | $ 1,300 | $ 1,300 | $ 1,300 | $ 6,000 | |||
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