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Construction Joint Ventures - Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance, beginning of period     $ 4,856 $ 656
Net income attributable to noncontrolling interest included in equity $ 1,251 $ 1,694 3,409 2,966
Distributions to noncontrolling interest owners     (1,350) 0
Balance, end of period $ 6,915 $ 3,622 $ 6,915 $ 3,622