Transactions With Parkway Properties, Inc. (Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Combinations [Abstract]
Revenues	$ 732,117	$ 855,318	$ 388,791
Income from continuing operations	179,625	237,909	31,695
Net income	174,117	237,323	52,853
Net income available to common stockholders	$ 166,375	$ 208,574	$ 45,364
Per share information:
Basic (in usd per share)	$ 0.42	$ 0.53	$ 0.22
Diluted (in usd per share)	$ 0.41	$ 0.53	$ 0.22

Business Acquisition, Pro Forma Net Income (Loss) Available to Common Stockholder

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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)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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- Definition

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.

+ References

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- Definition

Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

+ References

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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.

+ References

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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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