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Construction Joint Ventures - Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period $ 4,856 $ 656
Net income attributable to noncontrolling interest included in equity 1,191 371
Distributions to noncontrolling interest owners 0 0
Balance, end of period $ 6,047 $ 1,027