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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Loans modified through troubled debt restructurings		$ 10,400,000
Average Recorded Investment	$ 153,387,000	422,973,000	$ 943,761,000
Interest Income Recognized	50,000	2,261,000	17,618,000
Senior mortgages
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	129,135,000	370,010,000	825,656,000
Interest Income Recognized	38,000	2,080,000	11,245,000
Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	24,252,000	52,963,000	85,723,000
Interest Income Recognized	12,000	181,000	6,373,000
Subordinate mortgages
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	0	32,382,000
Interest Income Recognized	0	0	0
Nonperforming loans
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, interest income, cash basis method	0	0	13,300,000
With an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	132,492,000	139,672,000
Unpaid Principal Balance	131,514,000	138,801,000
Related Allowance	(72,165,000)	(64,990,000)
Average Recorded Investment	153,387,000	387,314,000	904,290,000
Interest Income Recognized	50,000	339,000	2,299,000
With an allowance recorded | Senior mortgages
Financing Receivable, Impaired [Line Items]
Recorded Investment	126,754,000	130,645,000
Unpaid Principal Balance	125,776,000	129,744,000
Related Allowance	(69,627,000)	(64,440,000)
Average Recorded Investment	129,135,000	334,351,000	794,247,000
Interest Income Recognized	38,000	158,000	1,976,000
With an allowance recorded | Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,738,000	9,027,000
Unpaid Principal Balance	5,738,000	9,057,000
Related Allowance	(2,538,000)	(550,000)
Average Recorded Investment	0	52,963,000	77,661,000
Interest Income Recognized	0	181,000	323,000
With an allowance recorded | Subordinate mortgages
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	24,252,000	0	32,382,000
Interest Income Recognized	12,000	0	0
With no related allowance recorded
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	35,659,000	39,471,000
Interest Income Recognized	0	1,922,000	15,319,000
With no related allowance recorded | Senior mortgages
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	35,659,000	31,409,000
Interest Income Recognized	0	1,922,000	9,269,000
With no related allowance recorded | Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	0	8,062,000
Interest Income Recognized	$ 0	$ 0	$ 6,050,000

X

- Definition

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.

+ References

No definition available.

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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