Real Estate Assets Real Estate Assets Pro Forma (Details) (Pro Forma 2013 Acquisitions [Member], USD $)	12 Months Ended
Dec. 31, 2013
Pro Forma 2013 Acquisitions [Member]
Business Combination, Purchase Price Allocation [Abstract]
Real estate assets	$ 445,396,000
Acquisition-related intangible assets (in deferred financing and leasing costs)	50,595,000
Fair value of debt assumed from the acquisition	(127,891,000)
Acquisition-related below market lease liabilities (in accounts payable, accrued expenses and other liabilities)	(17,818,000)
Total allocation	350,282,000
Business Acquisition, Pro Forma Information [Abstract]
Pro forma, assumption date of acquisition	Jan. 01, 2012
Pro forma revenues	593,778,000
Pro forma net income	121,754,000
Pro forma earnings per share - basic	$ 1.33
Pro forma earnings per share - diluted	$ 1.33
Revenues recorded due to acquisitions	25,000,000
Net income/(loss) recorded due to acquisitions	$ (200,000)

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

No definition available.

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- Definition

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)

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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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- Definition

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

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.

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-Name Accounting Standards Codification

-Topic 805

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-Glossary Financial Liability

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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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