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Income derived from investments in debt and equity securities and on cash and cash equivalents. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 14

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7(a),(b))

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a, b

-Article 5

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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

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 16

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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.

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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.

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- Definition

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

+ References

No definition available.

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- Definition

The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation and the related penalties from prepayment.

+ 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.

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Mortgage and Mezzanine Loans Receivable (Narratives) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Mar. 27, 2013 NY 701 Seventh Avenue [Member]	Apr. 17, 2013 Other Mezzanine Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage and mezzanine loans receivable	$ 176,388		$ 176,388		$ 225,359		$ 50,091
Mezzanine Loan Receivable Weighted Average Interest Rate	10.80%		10.80%		10.30%
Mezzanine Loans Receiveable - Maturity Start Date	August 2014		August 2014
Mezzanine Loans Receiveable - Maturity End Date	May 2016		May 2016
Mezzanine Loan Receivable - Maturity Date							August 2015
Proceeds from repayments of mortgage and mezzanine loans receivable and other			49,452	2,379
Proceeds From Collection Of Notes Receivable Including Prepayment Penalty							55,358
Interest and other investment (loss) income, net	(10,275)	10,523	(32,933)	(22,984)			5,267
Proceeds from the sale of participation right in mortgage and mezzanine loan receivable						59,375
Other liabilities	$ 452,456		$ 452,456		$ 400,934	$ 59,375
Percentage Of Participation In Mortgage Interest Sold						25.00%