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Construction Joint Ventures - Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended
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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

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