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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
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Principal Balance |  |  |
Loan repayments | $ (90,547) | $ (6,336) |
Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |
Principal Balance |  |  |
Principal balance, beginning | 3,706,169 |  |
New loan fundings | 488,638 |  |
Add-on loan fundings | 18,393 |  |
Loan repayments | (137,947) |  |
Unrealized gain (loss) on foreign currency translation | 13,555 |  |
Deferred fees and other items | 0 |  |
PIK interest, amortization of fees and other items | 10,564 |  |
Principal balance, ending | 4,099,372 |  | $ 3,706,169
Deferred Fees/Other Items |  |  |
Deferred fees/other items, beginning | (9,430) |  |
Unrealized gain (loss) on foreign currency translation | (113) |  |
Deferred fees and other items | (11,561) |  |
PIK interest, amortization of fees and other items | 6,207 |  |
Deferred fees/other items, ending | (14,897) |  | (9,430)
Provision for Loan Loss |  |  |
Provision for loans, beginning | (16,981) |  |
Provision for loans, ending | (16,981) |  | (16,981)
Carrying Value |  |  |
Carrying value, beginning balance | 3,679,758 |  |
Unrealized gain (loss) on foreign currency translation | 13,442 |  |
Deferred fees and other items | (11,561) |  |
PIK interest, amortization of fees and other items | 16,771 |  |
Carrying value, ending balance | 4,067,494 |  | 3,679,758
Provision for loan losses | 17,000 |  |
Other Assets [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |
Carrying Value |  |  |
Impairment | $ 3,000 |  | $ 3,000

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