Transactions With Parkway Properties, Inc. (Assets and Liabilities Transferred) (Details) - Spin-off $ in Thousands	Oct. 07, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets	$ 1,696,080
Cash	192,755
Notes and other receivables	43,752
Intangible assets	143,294
Other assets	6,669
Total assets of discontinued operation	2,082,550
Notes payable	803,769
Accounts payable and accrued expenses	56,055
Intangible liabilities	59,424
Other liabilities	22,241
Total liabilities of discontinued operation	941,489
Noncontrolling interest	22,821
Net assets in Spin-off to New Parkway	$ 1,118,240