Transactions With Parkway Properties, Inc. (Discontinued Operations) (Details) - Spin-off $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rental property revenues	$ 136,927
Rental property operating expenses	(58,336)
Other revenues	288
Interest expense	(6,022)
Depreciation and amortization	(47,345)
Other expenses	(6,349)
Income from discontinued operations	19,163
Cash provided by operating activities	42,604
Cash used in investing activities	$ 30,067

Amount of cash inflow (outflow) of investing activities of discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of interest expense attributable to disposal group, including, but not limited to, discontinued operation.

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