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Loans Receivable and Other Lending Investments, net (Schedule of Loans Receivable) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross carrying value of loans	$ 1,098,482		$ 1,456,068
Reserves for loan losses	(76,189)	$ (78,789)	(85,545)	$ (95,416)	$ (110,371)	$ (108,165)
Total loans receivable, net	1,022,293		1,370,523
Other lending investments—securities	87,149		79,916
Total loans receivable and other lending investments, net	1,109,442		1,450,439
Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross carrying value of loans	594,081		940,738
Corporate/Partnership loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross carrying value of loans	495,066		490,389
Subordinate mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross carrying value of loans	$ 9,335		$ 24,941

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- Definition

This item represents investments in debt securities which are categorized as held-to-maturity and securities classified as available for sale.

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Amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics. In addition, amount also includes total debt and equity financial instruments including: securities held-to-maturity and securities available-for-sale.

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- Definition

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.

+ References

No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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