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Dispositions, Assets Held for Sale and Discontinued Operations (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Dispositions Assets Held For Sale And Discontinued Operations (Additional Textual) [Abstract]
Gain (loss) on sales of properties, net	$ (29,997)	$ 32,450	$ 52,495	$ 33,219
Deposited in Section 1031 escrow			$ 137,790

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.