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Loans Receivable and Other Lending Investments, net (Schedule of Investment in Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Recorded investment (comprised of a loans carrying value plus accrued interest) in loans and the associated reserve for loan losses
Financing receivable, gross	$ 1,294,821	$ 1,463,003
Individually evaluated for impairment, reserves for loan losses	(78,489)	(85,545)
Total	1,216,332	1,377,458
Individually evaluated for impairment, net discount	(700)	(400)
Collectively evaluated for impairment, net discount	6,200	1,900
Interest receivable	5,300	6,900
Other lending investments—securities	89,576	79,916
Individually Evaluated for Impairment
Recorded investment (comprised of a loans carrying value plus accrued interest) in loans and the associated reserve for loan losses
Financing receivable, gross	237,877	253,941
Individually evaluated for impairment, reserves for loan losses	(60,989)	(62,245)
Total	176,888	191,696
Individually Evaluated for Impairment | Nonperforming Financial Instruments
Recorded investment (comprised of a loans carrying value plus accrued interest) in loans and the associated reserve for loan losses
Financing receivable, gross	157,200
Individually evaluated for impairment, reserves for loan losses	(12,500)
Release of general reserve	11,600
Collectively Evaluated for Impairment
Recorded investment (comprised of a loans carrying value plus accrued interest) in loans and the associated reserve for loan losses
Financing receivable, gross	1,056,944	1,209,062
Individually evaluated for impairment, reserves for loan losses	(17,500)	(23,300)
Total	$ 1,039,444	$ 1,185,762

X

- Definition

Reflects the amount of loans that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

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- Definition

Represents the unamortized discounts, premiums, deferred fees and costs relating to loans collectively evaluated for impairment and shown as a net premium (discount).

+ References

No definition available.

+ Details

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- Definition

Represents the unamortized discounts, premiums, deferred fees and costs relating to loans individually evaluated for impairment and shown as a net premium (discount).

+ References

No definition available.

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- References

No definition available.

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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

Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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. 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 a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ 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 210.9-03.10(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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