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Redeemable Noncontrolling Interest - Schedule of Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]    
Beginning balance January 1, 2019 $ 542,020  
Net income attributable to noncontrolling interest, including the contractual accretion of the put options 7,125 $ 0
Other 500  
Ending balance March 31, 2019 $ 549,645