Acquisitions and Dispositions (Details 4) $ in Thousands	Jun. 30, 2016 USD ($)
Business Acquisition [Line Items]
Land	$ 28,805
Building and improvements	791,817
Lease inducement	4,870
Contingent consideration	(156)
Receivables	104
Issuance of OP Units	2,869
Net assets acquired	877,367
1st Quarter
Business Acquisition [Line Items]
Land	9,240
Building and improvements	168,570
Lease inducement	1,284
Contingent consideration	0
Receivables	0
Issuance of OP Units	2,869
Net assets acquired	199,160
2nd Quarter
Business Acquisition [Line Items]
Land	19,565
Building and improvements	623,247
Lease inducement	3,586
Contingent consideration	(156)
Receivables	104
Issuance of OP Units	0
Net assets acquired	678,207
In-place lease intangible
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	32,069
In-place lease intangible \| 1st Quarter
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	19,158
In-place lease intangible \| 2nd Quarter
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	12,911
Above market in-place lease intangible
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	3,672
Above market in-place lease intangible \| 1st Quarter
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	2,407
Above market in-place lease intangible \| 2nd Quarter
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	1,265
Below market in-place lease intangible
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangible Liabilities	(3,389)
Below market in-place lease intangible \| 1st Quarter
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangible Liabilities	(469)
Below market in-place lease intangible \| 2nd Quarter
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangible Liabilities	(2,920)
Above market in-place ground lease
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangible Liabilities	(566)
Above market in-place ground lease \| 1st Quarter
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangible Liabilities	(218)
Above market in-place ground lease \| 2nd Quarter
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangible Liabilities	(348)
Below market in-place ground lease
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	23,010
Below market in-place ground lease \| 1st Quarter
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	2,057
Below market in-place ground lease \| 2nd Quarter
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 20,953

The amount of identifiable intangible lease liabilities recognized as of the acquisition date.

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Business combination, recognized identifiable assets acquired and liabilities assumed, lease inducement.

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Represents the value of operating partnership units issued as (noncash or part noncash) consideration for a business or asset acquired.

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Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date.

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The amount of liability arising from an inherited contingency (as defined) which has been recognized as of the acquisition date.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount of real estate acquired, at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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