Transactions With Parkway Properties, Inc. (Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest expense	$ 0	$ (1,965)	$ 0	$ (3,940)
Spin-off
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rental property revenues		44,281		87,404
Rental property operating expenses		(19,155)		(36,960)
Other revenues		102		288
Interest expense		(1,965)		(3,940)
Depreciation and amortization		(15,740)		(31,168)
Income from discontinued operations		7,523		15,624
Cash provided by operating activities		23,253		17,012
Cash used in investing activities		$ (9,375)		$ (18,112)