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Intangibles Assets and Liabilities - Summary of Intangible Amortization (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Amortization recorded against rental income related to above or below market leases
Acquired Finite-Lived Intangibles
Amortization of intangible assets and liabilties	$ 426	$ 295	$ 881	$ 715
Rental expense related to above or below market leasehold interests
Acquired Finite-Lived Intangibles
Amortization of intangible assets and liabilties	94	132	189	307
Amortization expense related to in place leases and tenant relationships
Acquired Finite-Lived Intangibles
Amortization of intangible assets and liabilties	$ 10,421	$ 11,696	$ 19,957	$ 21,446

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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