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Revenue from Contracts with Customers Revenue from Contracts with Customers - By Geographic Location (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue from external customers by geographic areas [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 255,993 $ 272,796 $ 519,845 $ 546,297
Domestic        
Revenue from external customers by geographic areas [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 248,872   504,964  
Foreign [Member]        
Revenue from external customers by geographic areas [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 7,121   $ 14,881  
[1] This represents revenue earned by non-U.S. domiciled subsidiaries.