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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								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
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of year				$ 2,693,092				$ 1,925,652	$ 2,693,092	$ 2,693,092	$ 1,925,652
Loan fundings										1,828,758	1,127,039
Loan repayments										(891,848)	(331,189)
Participation sold										0	(24,051)
Unrealized gain (loss) on foreign currency translation										23,612	(33,383)
Discount accretion										0	13,656
Provision for loan losses										(1,981)	(15,000)
Deferred Fees										(27,424)	0
PIK interest, amortization of fees and other items										55,549	30,368
Balance at close of the year	$ 3,679,758				$ 2,693,092					3,679,758	2,693,092	$ 1,925,652
Provision for loan losses and impairment	$ 0	$ 0	$ 5,000	$ 0	$ 0	$ 0	$ 15,000	$ 0		5,000	15,000	$ 0
Commercial Mortgage Portfolio Segment [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Provision for loan losses and impairment										11,981	10,000
Commercial Mortgage and Subordinated Portfolio Segment [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Provision for loan losses and impairment									1,981	1,981
Subordinate Mortgage Portfolio Segment [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Provision for loan losses and impairment										5,000	$ 5,000
Other Assets [Member] | Commercial Mortgage Portfolio Segment [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Impairment										3,019
Other Assets [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Impairment									$ 3,019
Affiliated Entity [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Loan fundings										50,000
Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Provision for loan losses and impairment										$ 1,981

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Total carrying amount of mortgage loans as of the balance sheet date.

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