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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Article 5

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- Definition

The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

The percentage of ownership in the Mezzanine Loan Investment.

+ References

No definition available.

+ Details

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- Definition

Mezzanine Loan Receivable Maturity Date

+ References

No definition available.

+ Details

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- Definition

Mezzanine Loan Receivable Interest Rate

+ References

No definition available.

+ Details

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- Definition

Mezzanine Loans Receiveable - Maturity End Date

+ References

No definition available.

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- Definition

Mezzanine Loans Receivable Maturity Date Range Start

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

This element represents the percentage of interest in mortgage interest / mezzanine loan sold for a consideration.

+ References

No definition available.

+ Details

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- Definition

The cash inflow associated with principal repayment from a borrowing supported by a written promise to pay an obligation.

+ References

No definition available.

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- Definition

The cash inflow resulting from the sale of participation in a mortgage loan receivable to a third party. The transfer of the participation right does not qualify as a sale due to continuing invlovement.

+ References

No definition available.

+ Details

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Mortgage and Mezzanine Loans Receivable (Narratives) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended	1 Months Ended			1 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Mar. 31, 2013 NY 701 Seventh Avenue [Member]	Jan. 31, 2014 NY 701 Seventh Avenue [Member]	Oct. 31, 2012 NY 701 Seventh Avenue [Member]	May 31, 2014 Other Mezzanine Loan [Member]	Mar. 31, 2014 Other Mezzanine Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mezzanine Loan Ownership Percentage (in percentage)					25.00%
Percentage Of Participation In Mortgage Interest Sold			25.00%
Proceeds From Sale Of Participation In Mortgage Loan Receivable			$ 59,375
Other liabilities	380,843	438,353	59,375	59,375
Prepayment Of Mezzanine Loan Receivable						25,000	30,000
Mezzanine Loan Receivable Maturity Date						November 2014	January 2015
Mortgage and mezzanine loans receivable	$ 17,085	$ 170,972		$ 59,375
Mezzanine Loan Receivable Weighted Average Interest Rate	9.10%	11.00%
Mezzanine Loans Receiveable - Maturity Start Date	April 2015
Mezzanine Loans Receiveable - Maturity End Date	May 2016