Real Estate Assets Real Estate Assets Pro Forma (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition, Pro Forma Information [Abstract]
Pro forma, assumption date of acquisition	Jan. 01, 2014		Jan. 01, 2012
Pro Forma 2015 Acquisitions [Member]
Business Combination, Purchase Price Allocation [Abstract]
Real estate assets	$ 275,639
Acquisition-related intangible assets (in deferred financing and leasing costs)	23,722
Acquisition-related below market lease liabilities (in accounts payable, accrued expenses and other liabilities)	(9,076)
Total allocation	290,285
Business Acquisition, Pro Forma Information [Abstract]
Pro forma revenues	626,067	$ 584,650
Pro forma net income	103,485	113,284
Pro forma net income available to common stockholders	$ 96,797	$ 105,769
Pro forma earnings per share - basic	$ 1.03	$ 1.17
Pro forma earnings per share - diluted	$ 1.02	$ 1.17
Revenues recorded due to acquisitions	$ 7,300
Net income/(loss) recorded due to acquisitions	$ (1,200)
Pro Forma 2013 Acquisitions [Member]
Business Combination, Purchase Price Allocation [Abstract]
Real estate assets			$ 445,396
Acquisition-related intangible assets (in deferred financing and leasing costs)			50,595
Mortgages and notes payable			(127,891)
Acquisition-related below market lease liabilities (in accounts payable, accrued expenses and other liabilities)			(17,818)
Total allocation			350,282
Business Acquisition, Pro Forma Information [Abstract]
Pro forma revenues			538,890
Pro forma net income			121,754
Pro forma net income available to common stockholders			$ 113,606
Pro forma earnings per share - basic			$ 1.33
Pro forma earnings per share - diluted			$ 1.33
Revenues recorded due to acquisitions			$ 25,000
Net income/(loss) recorded due to acquisitions			$ (200)

The date the transaction is assumed to be acquired with respect to pro forma disclosure.

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The pro forma net income (loss) available to common stockholders for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

No definition available.

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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-Name Accounting Standards Codification
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This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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The amount of financial liabilities assumed (as defined) which have been recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount of liabilities assumed 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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The amount of property, plant, and equipment recognized as of the acquisition date.

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