Transactions With Parkway Properties, Inc. (Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest expense	$ 0	$ (1,956)	$ 0	$ (5,896)
Spin-off
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rental property revenues		46,046		133,450
Rental property operating expenses		(19,638)		(56,598)
Other revenues		0		288
Interest expense		(1,956)		(5,896)
Depreciation and amortization		(15,221)		(46,389)
Acquisition and transaction costs		(494)		(494)
Income from discontinued operations		8,737		24,361
Cash provided by operating activities		26,589		43,601
Cash used in investing activities		$ (11,130)		$ (29,242)

Disposal Group, Including Discontinued Operation, Acquisition And Transaction Costs

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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 cash inflow (outflow) of operating activities of discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount after tax of income (loss) from operations classified as a discontinued operation. Excludes gain (loss) on disposal and provision for gain (loss) until disposal.

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Amount of depreciation and amortization expense attributable to disposal group, including, but not limited to, discontinued operation.

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

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Amount of other income attributable to disposal group, including, but not limited to, discontinued operation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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