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Commercial Mortgage and Subordinate Loans, Net - Activity Relating to Loan Investment Portfolio (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Principal Balance |  |  |  |  |  |  |  |  |  |  |
Loan repayments |  |  |  |  |  |  |  |  | $ (675,140) | $ (218,002) | $ (205,226)
Provision for Loan Loss |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses | $ (15,000) | $ 0 | $ (5,000) | $ 0 | $ 0 | $ 0 | $ (5,000) | $ 0 | (20,000) | (5,000) | $ (15,000)
Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Principal Balance |  |  |  |  |  |  |  |  |  |  |
Principal balance, beginning |  |  |  | 3,706,169 |  |  |  |  | 3,706,169 |  |
New loan fundings |  |  |  |  |  |  |  |  | 2,069,909 |  |
Add-on loan fundings |  |  |  |  |  |  |  |  | 280,956 |  |
Loan repayments |  |  |  |  |  |  |  |  | (1,066,843) |  |
Unrealized gain (loss) on foreign currency translation |  |  |  |  |  |  |  |  | (51,202) |  |
PIK interest, amortization of fees and other items |  |  |  |  |  |  |  |  | 43,525 |  |
Principal balance, ending | 4,982,514 |  |  |  | 3,706,169 |  |  |  | 4,982,514 | 3,706,169 |
Deferred Fees/Other Items |  |  |  |  |  |  |  |  |  |  |
Deferred fees/other items, beginning |  |  |  | (9,430) |  |  |  |  | (9,430) |  |
Unrealized gain (loss) on foreign currency translation |  |  |  |  |  |  |  |  | 189 |  |
Deferred fees and other items |  |  |  |  |  |  |  |  | (34,066) |  |
PIK interest, amortization of fees and other items |  |  |  |  |  |  |  |  | 25,367 |  |
Deferred fees/other items, ending | (17,940) |  |  |  | (9,430) |  |  |  | (17,940) | (9,430) |
Provision for Loan Loss |  |  |  |  |  |  |  |  |  |  |
Provision for loans, beginning |  |  |  | (16,981) |  |  |  |  | (16,981) |  |
Provision for loan losses |  |  |  |  |  |  |  |  | (20,000) |  |
Provision for loans, ending | (36,981) |  |  |  | (16,981) |  |  |  | (36,981) | (16,981) |
Carrying Value |  |  |  |  |  |  |  |  |  |  |
Carrying value, beginning balance |  |  |  | $ 3,679,758 |  |  |  |  | 3,679,758 |  |
Unrealized gain (loss) on foreign currency translation |  |  |  |  |  |  |  |  | (51,013) |  |
Deferred fees and other items |  |  |  |  |  |  |  |  | (34,066) |  |
PIK interest, amortization of fees and other items |  |  |  |  |  |  |  |  | 68,892 |  |
Carrying value, ending balance | $ 4,927,593 |  |  |  | $ 3,679,758 |  |  |  | 4,927,593 | $ 3,679,758 |
Other Assets [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  | $ 3,000 |  | $ 3,000 |  |

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