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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 145,590	$ 250,230	$ 176,352	$ 251,467
Interest Income Recognized	0	0	92	0
Non-performing loan
Total gross carrying value of loans	989,002		989,002		$ 1,289,568
Preferred equity security, face value	$ 100,000		100,000
Preferred equity security, mandatory redemption period	5 years
Senior mortgages
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 67,252	82,368	71,949	83,556
Interest Income Recognized	0	0	0	0
Non-performing loan
Total gross carrying value of loans	849,192		849,192		791,152
Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	78,338	156,839	104,403	156,941
Interest Income Recognized	0	0	0	0
Non-performing loan
Total gross carrying value of loans	129,988		129,988		488,921
Subordinate mortgages
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	11,023	0	10,970
Interest Income Recognized	0	0	92	0
Non-performing loan
Total gross carrying value of loans	9,822		9,822		9,495
With no related allowance recorded
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	11,023	0	10,970
Interest Income Recognized	0	0	92	0
With no related allowance recorded | Subordinate mortgages
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	11,023	0	10,970
Interest Income Recognized	0	0	92	0
With an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	67,068		67,068		237,877
Unpaid Principal Balance	67,451		67,451		227,280
Related Allowance	(40,395)		(40,395)		(60,989)
Average Recorded Investment	145,590	239,207	176,352	240,497
Interest Income Recognized	0	0	0	0
With an allowance recorded | Senior mortgages
Financing Receivable, Impaired [Line Items]
Recorded Investment	67,068		67,068		81,343
Unpaid Principal Balance	67,451		67,451		81,431
Related Allowance	(40,395)		(40,395)		(48,518)
Average Recorded Investment	67,252	82,368	71,949	83,556
Interest Income Recognized	0	0	0	0
With an allowance recorded | Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	0		0		156,534
Unpaid Principal Balance	0		0		145,849
Related Allowance	0		0		$ (12,471)
Average Recorded Investment	78,338	156,839	104,403	156,941
Interest Income Recognized	0	$ 0	0	$ 0
Non-performing loan | Corporate/Partnership loans
Non-performing loan
Total gross carrying value of loans	145,800		$ 145,800
Proceeds from repayment of loan	45,800
Loan loss provision	$ 21,400

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The interest income recognized on a cash-basis or accrual method of accounting during the time within that period that the financing receivables were impaired.

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Reflects the aggregate gross carrying amount of all categories of loans held in portfolio, after deducting deferred income, but before deducting the allowance for losses on loans.

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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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The cash inflow associated with the collection, including prepayments, of loans receivable issued for financing of goods and services.

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