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Organization and Basis of Presentation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Service Expense and General and Administrative Expense [Line Items]    
Service expense $ 340,498 $ 303,115
General and administrative expense $ 19,401 17,898
As Previously Reported    
Service Expense and General and Administrative Expense [Line Items]    
Service expense   310,701
General and administrative expense   10,312
Reclassifications    
Service Expense and General and Administrative Expense [Line Items]    
Service expense   (7,586)
General and administrative expense   $ 7,586