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Subsidiaries and Joint Ventures With Noncontrolling Owners' Interests - Changes In Noncontrolling Owners' Interests (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Balance, beginning of period     $ 656 $ (91)
Net income attributable to noncontrolling interest included in equity $ 1,694 $ 740 2,966 1,252
Distributions to noncontrolling interest owners     0 0
Balance, end of period $ 3,622 $ 1,161 $ 3,622 $ 1,161