Variable Interest Entities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	6 Months Ended	12 Months Ended
Dec. 21, 2011 Suffolk Retail Llc Member	Jun. 17, 2010 White Plains LLC [Member]	Dec. 31, 2011 Other Joint Ventures [Member] jointventures	Dec. 31, 2011 SVVI [Member]
Company's consolidated VIEs interest	50.00%	66.67%	50.00%
Number Of Joint Ventures Invested In			1
Investment in unconsolidated VIE				$ 178.4
Accrued interest receivable				$ 178.4

Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 8

-Article 5

Reference 2: 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

Name:	us-gaap_InterestReceivableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant