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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 249,659		$ 249,659		$ 253,941
Unpaid Principal Balance	239,224		239,224		243,409
Related Allowance	(60,989)		(60,989)		(62,245)
Average Recorded Investment	250,230	$ 147,137	251,467	$ 142,256
Interest Income Recognized	0	111	0	111
Senior mortgages
Financing Receivable, Impaired [Line Items]
Recorded Investment	82,282		82,282		85,933
Unpaid Principal Balance	82,390		82,390		85,780
Related Allowance	(48,518)		(48,518)		(49,774)
Average Recorded Investment	82,368	136,128	83,556	133,003
Interest Income Recognized	0	111	0	111
Subordinate mortgages
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,002		11,002		10,862
Unpaid Principal Balance	10,985		10,985		10,846
Related Allowance	0		0		0
Average Recorded Investment	11,023	5,785	10,970	3,857
Interest Income Recognized	0	0	0	0
Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	156,375		156,375		157,146
Unpaid Principal Balance	145,849		145,849		146,783
Related Allowance	(12,471)		(12,471)		(12,471)
Average Recorded Investment	156,839	5,224	156,941	5,396
Interest Income Recognized	0	0	0	0
With no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,002		11,002		10,862
Unpaid Principal Balance	10,985		10,985		10,846
Related Allowance	0		0		0
Average Recorded Investment	11,023	14,935	10,970	9,957
Interest Income Recognized	0	111	0	111
With no related allowance recorded | Senior mortgages
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	9,150	0	6,100
Interest Income Recognized	0	111	0	111
With no related allowance recorded | Subordinate mortgages
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,002		11,002		10,862
Unpaid Principal Balance	10,985		10,985		10,846
Related Allowance	0		0		0
Average Recorded Investment	11,023	5,785	10,970	3,857
Interest Income Recognized	0	0	0	0
With an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	238,657		238,657		243,079
Unpaid Principal Balance	228,239		228,239		232,563
Related Allowance	(60,989)		(60,989)		(62,245)
Average Recorded Investment	239,207	132,202	240,497	132,299
Interest Income Recognized	0	0	0	0
With an allowance recorded | Senior mortgages
Financing Receivable, Impaired [Line Items]
Recorded Investment	82,282		82,282		85,933
Unpaid Principal Balance	82,390		82,390		85,780
Related Allowance	(48,518)		(48,518)		(49,774)
Average Recorded Investment	82,368	126,978	83,556	126,903
Interest Income Recognized	0	0	0	0
With an allowance recorded | Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	156,375		156,375		157,146
Unpaid Principal Balance	145,849		145,849		146,783
Related Allowance	(12,471)		(12,471)		$ (12,471)
Average Recorded Investment	156,839	5,224	156,941	5,396
Interest Income Recognized	$ 0	$ 0	$ 0	$ 0

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

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- Definition

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=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 15
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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

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