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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company provides general contracting and real estate services to certain related party entities that are not included in these consolidated financial statements. Revenue from construction contracts with related party entities of the Company was $7.6 million, $26.7 million and $9.6 million for the years ended December 31, 2017, 2016, and 2015, respectively. Gross profits from such contracts were $0.4 million, $1.0 million and $0.3 million for the years ended December 31, 2017, 2016, and 2015, respectively. Amounts from related parties of the Company included in construction receivables as of December 31, 2017 and 2016 were $0.2 million and $3.4 million, respectively. Real estate services fees from affiliated entities of the Company were not material for any of the years ended December 31, 2017, 2016, and 2015. In addition, affiliated entities also reimburse the Company for monthly maintenance and facilities management services provided to the properties. Cost reimbursements earned by the Company from affiliated entities were not material for any of the years ended December 31, 2017, 2016, and 2015. In connection with the formation transactions for the Company's IPO, the Operating Partnership entered into tax protection agreements that indemnify certain directors and executive officers of the Company from their tax liabilities resulting from the potential future sale of certain of the Company’s properties within seven (or, in a limited number of cases, ten) years of the completion of the formation transactions on May 13, 2013. Upon completing the sale of the Virginia Natural Gas office property on November 20, 2014, the Operating Partnership paid $1.3 million under such tax protection agreements.