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Overview and Basis of Presentation - Revenue in Condensed Consolidated Statement of Operations in Connection with Adoption of Topic 606 (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue:        
Total revenue $ 363,677 $ 364,774 $ 641,105 $ 690,581
Services        
Revenue:        
Total revenue 314,723 319,179 560,271 609,822
Products        
Revenue:        
Total revenue $ 48,954 $ 45,595 $ 80,834 $ 80,759