Real Estate Transaction (Summary Of Real Estate Property) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2011
# of Bldgs.	1
Rentable Square Feet	204,057
Investment by Company	$ 46,340
55 Corporate [Member]
Date	05/01/11
Property/Address	55 Corporate Drive
Location	Bridgewater, New Jersey
# of Bldgs.	1
Rentable Square Feet	204,057
Investment by Company	$ 46,340

Investments in real estate held solely for investment purposes (income production and capital appreciation).

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

-Section 03

-Paragraph 1

-Subparagraph d

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(d))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Name:	us-gaap_RealEstateInvestments
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant