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Related Party Transactions (Details) $ in Thousands, € in Millions, £ in Millions	1 Months Ended								3 Months Ended								12 Months Ended
	May 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 GBP (£)	May 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	May 31, 2017 USD ($)	May 31, 2017 EUR (€)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2014
Related Party Transaction [Line Items]
Related party expenses									$ 10,428	$ 10,434	$ 10,259	$ 9,613	$ 9,804	$ 9,515	$ 9,013	$ 8,092	$ 40,734	$ 36,424	$ 31,652
Base management fees incurred but not yet paid									10,430				9,804				10,430	9,804
Commercial mortgage loans and subordinate loans and other lending assets, net									$ 6,375,093				4,927,593				6,375,093	4,927,593
Arrangement Fees
Related Party Transaction [Line Items]
Related party expenses	$ 600
Sale of mezzanine loan one
Related Party Transaction [Line Items]
Proceeds from sale of loan																	30,300
Sale of mezzanine loan two
Related Party Transaction [Line Items]
Proceeds from sale of loan																	$ 122,300
Limited Liability Company
Related Party Transaction [Line Items]
Rate of management fees																	1.50%
Extension period																	1 year
Period of termination																	180 days
Termination fee calculation period																	24 months
Affiliated Entity | Management Fees
Related Party Transaction [Line Items]
Related party expenses																	$ 40,700	36,400	31,700
Affiliated Entity | Reimbursements
Related Party Transaction [Line Items]
Related party expenses																	$ 3,600	3,100	$ 2,600
Champ Limited Partnership
Related Party Transaction [Line Items]
Proceeds from sale of ownership interest in equity method investment							$ 24,500	€ 21.8
Loss from sale of ownership interest							$ 3,300
Champ Limited Partnership | Subsidiaries
Related Party Transaction [Line Items]
Indirect ownership interest from limited partnership									0.00%								0.00%			59.00%
Commercial Mortgage Portfolio Segment
Related Party Transaction [Line Items]
Commercial mortgage loans and subordinate loans and other lending assets, net									$ 5,326,967				$ 3,878,981				$ 5,326,967	$ 3,878,981
Commercial Mortgage Portfolio Segment | Affiliated Entity
Related Party Transaction [Line Items]
Payments to acquire loans receivable		$ 6,400	£ 4.8	$ 28,200	$ 25,000	$ 25,000
Commercial mortgage loans and subordinate loans and other lending assets, net				$ 300,000	$ 125,000	$ 100,000

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Cash Flows between a transferor and a transferee attributable to newly transferred assets related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

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Carrying amount as of the balance sheet date of obligations due all related parties.

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