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Schedule IV - Mortgage Loans on Real Estate - Summary of Changes in Carrying Amounts of Mortgage Loans (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
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of year				$ 3,679,758				$ 2,693,092	$ 3,679,758	$ 2,693,092
Loan fundings									2,350,865	1,828,758
Loan repayments									(1,066,843)	(891,848)
Unrealized gain (loss) on foreign currency translation									(51,013)	23,612
Discount accretion									0	0
Provision for loan losses									(20,000)	(1,981)
Deferred Fees									(34,066)	(27,424)
PIK interest, amortization of fees and other items									68,892	55,549
Balance at close of the year	$ 4,927,593				$ 3,679,758				4,927,593	3,679,758	$ 2,693,092
Provision for loan losses and impairment	15,000	$ 0	$ 5,000	$ 0	$ 0	$ 0	$ 5,000	$ 0	20,000	5,000	$ 15,000
Commercial Mortgage Portfolio Segment [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Provision for loan losses and impairment										37,000
Commercial Mortgage and Subordinated Portfolio Segment [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Provision for loan losses and impairment									20,000
Subordinate Mortgage Portfolio Segment [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Provision for loan losses and impairment										17,000
Other Assets [Member] | Commercial Mortgage Portfolio Segment [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Impairment										3,000
Other Assets [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Impairment							3,000		3,000
Affiliated Entity [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Loan fundings									34,600
Residential Condominium - Bethesda, MD And Retail Center - Cincinnati, OH [Member] | Commercial Mortgage Portfolio Segment [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Provision for loan losses and impairment									20,000
Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage Portfolio Segment [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Provision for loan losses and impairment									5,000
Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Provision for loan losses and impairment			$ 5,000				$ 2,000			$ 2,000
Retail Center - Cincinnati, OH [Member] | Commercial Mortgage Portfolio Segment [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Provision for loan losses and impairment	$ 15,000								$ 15,000

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