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Equity - Non-Controlling Interest (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance at December 31, 2017 $ 484,550  
Net loss attributable to non-controlling interest (648) $ 0
Balance at March 31, 2018 478,099  
Non-Controlling Interest    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance at December 31, 2017 48,931  
Net loss attributable to non-controlling interest (648)  
Other comprehensive income 24  
Balance at March 31, 2018 $ 48,307