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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