Investment In Real Estate - Quantitative Information About Level 3 Fair Value Measurements (Details) (Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 sqft Property
Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Number Of Industrial Properties	1
Fair Value of Property	$ 585
Unobservable Inputs, Discount Rate	11.75%
Unobservable Inputs, Market Rent Growth Rate	2.00%
Unobservable Inputs, Expense Growth Rate	2.00%
Unobservable Inputs, Rental Rates Per Square Foot	4.25	[1]
Unobservable Inputs, Terminal Capitalization Rate	10.00%
Gross Leaseable Area	10,000
Third Party Pricing [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Number Of Industrial Properties	14
Fair Value of Property	$ 36,175	[2]
Gross Leaseable Area	2,100,000

[1] Estimates for market rental rates upon stabilization of the property.

[2] The fair value for the properties is based upon the value of either a third party purchase contract or third party letters of intent, both of which are subject to our corroboration for reasonableness. Certain of the properties are included in portfolios whereby the letter of intent pricing relates to the respective portfolio. The estimated purchase price for the portfolio was allocated to the individual properties within the portfolio based upon their relative fair value.