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Commercial Mortgage and Subordinate Loans, Net - Activity Relating to Loan Investment Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Principal Balance                        
Loan repayments                   $ (218,002) $ (206,573) $ (103,963)
Provision for Loan Loss                        
Provision for loan loss $ 0 $ 0 $ (5,000) $ 0 $ 0 $ 0 $ (15,000) $ 0   (5,000) (15,000) $ 0
Commercial Mortgage and Subordinated Portfolio Segment [Member]                        
Principal Balance                        
Principal balance, beginning       2,720,344         $ 2,720,344 2,720,344    
Loan fundings                   1,828,758    
Loan repayments                   (891,848)    
Unrealized gain on foreign currency translation                   23,766    
Deferred fees and other items                   0    
PIK interest, amortization of fees and other items                   25,149    
Principal balance, ending 3,706,169       2,720,344         3,706,169 2,720,344  
Deferred Fees/Other Items                        
Deferred fees/other items, beginning       (12,252)         (12,252) (12,252)    
Unrealized gain on foreign currency translation                   (154)    
Deferred fees and other items                   (27,424)    
PIK interest, amortization of fees and other items                   30,400    
Deferred fees/other items, ending (9,430)       (12,252)         (9,430) (12,252)  
Provision for Loan Loss                        
Provision for loans, beginning       $ (15,000)         (15,000) (15,000)    
Provision for loan loss                 (1,981) (1,981)    
Provision for loans, ending (16,981)       (15,000)         (16,981) (15,000)  
Carrying Value                        
Loans and Leases Receivable, Net Amount $ 3,679,758       $ 2,693,092         3,679,758 $ 2,693,092  
Loans and Leases Receivable, Net, Foreign Currency Gain (Loss)                   23,612    
Loans and Leases Receivable, Deferred Income, Unamortized Loan Commitment and Origination Fees, and Unamortized Discounts or Premiums, Period Increase                   (27,424)    
Loans and Leases Receivable, Net, Deferred Income, PIK Interest, Loan Commitment and Origination Fees, and Discounts or Premiums, Amortization                   $ 55,549    
Other Assets [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member]                        
Carrying Value                        
Impairment                 $ 3,019