Consolidated Statements of Cash Flows - Supplemental Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]
Interest paid, net of amounts capitalized	$ 32,215	$ 29,337	$ 28,840
Income taxes paid	0	2	4
Non-Cash Transactions:
Non-cash assets and liabilities assumed in Merger	1,886,815	0	0
Non-cash assets and liabilities distributed in Spin-Off	(948,306)	0	0
Mortgage note payable legally defeased	20,170	0	0
Transfer from land held to projects under development	8,099	0	5,185
Change in accrued property acquisition, development, and tenant asset expenditures	7,918	(2,483)	(531)
Transfer from investment in unconsolidated joint ventures to projects under development	5,880	0	0
Transfer from projects under development to operating properties	0	121,709	0
Transfer from operating properties and related assets to real estate assets and other assets held for sale	0	7,246	0
Transfer from operating properties and related liabilities to liabilities of real estate assets held for sale	$ 0	$ 1,347	$ 0