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Construction Joint Ventures - Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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 $ 966 $ 901 2,158 1,272
Distributions to noncontrolling interest owners     0 0
Balance, end of period $ 7,014 $ 1,928 $ 7,014 $ 1,928