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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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 152,855		$ 152,855		$ 132,492
Unpaid Principal Balance	151,681		151,681		131,514
Related Allowance	(73,371)		(73,371)		(72,165)
Average Recorded Investment	147,137	$ 158,317	142,256	$ 152,102
Interest Income Recognized	111	20	111	46
Subordinate mortgages
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,570		11,570		0
Unpaid Principal Balance	11,553		11,553		0
Related Allowance	0		0		0
With no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	20,787		20,787		0
Unpaid Principal Balance	20,753		20,753		0
Related Allowance	0		0		0
Average Recorded Investment	14,935	0	9,957	0
Interest Income Recognized	111	0	111	0
With no related allowance recorded | Senior mortgages
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,217		9,217		0
Unpaid Principal Balance	9,200		9,200		0
Related Allowance	0		0		0
Average Recorded Investment	9,150	0	6,100	0
Interest Income Recognized	111	0	111	0
With no related allowance recorded | Subordinate mortgages
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	5,785		3,857
Interest Income Recognized	0		0
With an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	132,068		132,068		132,492
Unpaid Principal Balance	130,928		130,928		131,514
Related Allowance	(73,371)		(73,371)		(72,165)
Average Recorded Investment	132,202	158,317	132,299	152,102
Interest Income Recognized	0	20	0	46
With an allowance recorded | Senior mortgages
Financing Receivable, Impaired [Line Items]
Recorded Investment	127,023		127,023		126,754
Unpaid Principal Balance	125,886		125,886		125,776
Related Allowance	(70,833)		(70,833)		(69,627)
Average Recorded Investment	126,978	130,016	126,903	130,226
Interest Income Recognized	0	17	0	34
With an allowance recorded | Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,045		5,045		5,738
Unpaid Principal Balance	5,042		5,042		5,738
Related Allowance	(2,538)		(2,538)		$ (2,538)
Average Recorded Investment	5,224	28,301	5,396	21,876
Interest Income Recognized	$ 0	$ 3	$ 0	$ 12

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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- 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=49124121&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=49124121&loc=d3e5258-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524

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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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-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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