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Dispositions, Assets Held for Sale and Discontinued Operations (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge	$ 0	$ 0
Dispositions Assets Held For Sale And Discontinued Operations (Additional Textual) [Abstract]
Gain (loss) on sales of properties, net	82,492	769
Deposited in Section 1031 escrow	$ 139,758

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

Escrow deposits related to property sales in noncash investing and financing activities.