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Related Party Transactions (Details) $ in Thousands, £ in Millions	1 Months Ended						3 Months Ended								12 Months Ended
	Jan. 31, 2020 USD ($)	Jan. 31, 2020 GBP (£)	Dec. 31, 2019 USD ($)	May 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 GBP (£)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Related party expenses							$ 9,598	$ 9,927	$ 9,957	$ 10,268	$ 10,428	$ 10,434	$ 10,259	$ 9,613	$ 39,750	$ 40,734	$ 36,424
Base management fees incurred but not yet paid			$ 10,430				9,598				10,430				$ 9,598	10,430
Sale of Mezzanine Loan
Related Party Transaction [Line Items]
Proceeds from sale of loan	$ 81,300	£ 62.2	30,300
Sale Of Mezzanine Loan Two
Related Party Transaction [Line Items]
Proceeds from sale of loan			122,300
Sale of Unfunded Commitment of Senior Mortgage
Related Party Transaction [Line Items]
Proceeds from sale of loan	$ 65,300	£ 50.0
Arrangement fees
Related Party Transaction [Line Items]
Related party expenses				$ 600
Affiliated Entity | Commercial Mortgage Portfolio Segment
Related Party Transaction [Line Items]
Payments to Acquire Mortgage Notes Receivable					$ 6,400	£ 4.8
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
Limited Liability Company | Management fees
Related Party Transaction [Line Items]
Base management fees incurred but not yet paid			$ 10,400				$ 9,600				$ 10,400				$ 9,600	10,400
Affiliated Entity | Management fees
Related Party Transaction [Line Items]
Related party expenses															39,800	40,700	36,400
Affiliated Entity | Reimbursements
Related Party Transaction [Line Items]
Related party expenses															$ 4,500	$ 3,600	$ 3,100

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

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The cash outflow from the purchase of receivables arising from the mortgage note on real estate.

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