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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Non-performing loan
Total gross carrying value of loans	$ 963,975			$ 963,975		$ 1,289,568
Preferred equity security, face value		$ 100,000
Preferred equity security, mandatory redemption period		5 years
Average Recorded Investment	67,001		$ 243,907	148,998	$ 248,138
Interest Income Recognized	209		385	301	385
With no related allowance recorded
Non-performing loan
Average Recorded Investment	0		5,501	0	8,227
Interest Income Recognized	209		385	301	385
With an allowance recorded
Non-performing loan
Recorded Investment	66,936			66,936		237,877
Unpaid Principal Balance	67,133			67,133		227,280
Related Allowance	(40,395)			(40,395)		(60,989)
Average Recorded Investment	67,001		238,406	148,998	239,911
Interest Income Recognized	0		0	0	0
Nonrecurring Basis | Fair Value, Inputs, Level 3
Non-performing loan
Preferred equity security, fair value		$ 77,000
Senior mortgages
Non-performing loan
Total gross carrying value of loans	801,595			801,595		791,152
Average Recorded Investment	67,001		82,007	70,696	83,100
Interest Income Recognized	0		0	0	0
Senior mortgages | With an allowance recorded
Non-performing loan
Recorded Investment	66,936			66,936		81,343
Unpaid Principal Balance	67,133			67,133		81,431
Related Allowance	(40,395)			(40,395)		(48,518)
Average Recorded Investment	67,001		82,007	70,696	83,100
Interest Income Recognized	0		0	0	0
Corporate/Partnership loans
Non-performing loan
Total gross carrying value of loans	152,390			152,390		488,921
Average Recorded Investment	0		156,399	78,302	156,811
Interest Income Recognized	0		0	0	0
Corporate/Partnership loans | With an allowance recorded
Non-performing loan
Recorded Investment	0			0		156,534
Unpaid Principal Balance	0			0		145,849
Related Allowance	0			0		(12,471)
Average Recorded Investment	0		156,399	78,302	156,811
Interest Income Recognized	0		0	0	0
Subordinate mortgages
Non-performing loan
Total gross carrying value of loans	9,990			9,990		$ 9,495
Average Recorded Investment	0		5,501	0	8,227
Interest Income Recognized	209		385	301	385
Subordinate mortgages | With no related allowance recorded
Non-performing loan
Average Recorded Investment	0		5,501	0	8,227
Interest Income Recognized	$ 209		$ 385	$ 301	$ 385
Non-Performing Loan | Corporate/Partnership loans
Non-performing loan
Total gross carrying value of loans		145,800
Proceeds from repayment of loan		45,800
Loan loss provision		$ 21,400

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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