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Construction Joint Ventures - Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period $ 7,859 $ 4,856
Net income attributable to noncontrolling interest included in equity 46 1,191
Distributions to noncontrolling interest owners (5,100) 0
Balance, end of period $ 2,805 $ 6,047