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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