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Basis of Presentation, Consolidation, Investments in Joint Ventures, and Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]          
Beginning Balance   $ 698 $ 698 $ 698 $ 698
Net income allocable to noncontrolling interests, excluding redeemable noncontrolling interests $ (382) $ 379   (10) 604
Ending Balance $ 698   $ 698 698  
Excluding Redeemable Non-Controlling Interests          
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]          
Net income allocable to noncontrolling interests, excluding redeemable noncontrolling interests       $ 0 $ 0