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Construction Joint Ventures - Change in Non-controlling Interest (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]      
Balance, beginning of period $ 4,856 $ 656 $ 91
Net income attributable to noncontrolling interest included in equity 4,353 4,200 1,826
Distributions to noncontrolling interest owners (1,350) 0 (1,079)
Balance, end of period $ 7,859 $ 4,856 $ 656