Acquisitions and Dispositions (Summary of Allocation of Fair Value of Amounts Recognized) (Details) (Other Two Thousand Thirteen Acquisitions [Member] [Domain] [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Other Two Thousand Thirteen Acquisitions [Member] [Domain] [Member]
Real estate assets	$ 388,100
Lease related intangible assets	54,499
Total acquired assets	442,599
Secured debt	103,638
Other liabilities	2,682
Total assumed liabilities	106,320
Fair value of acquired assets	$ 336,279