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Basis of Presentation - Reclassifications to Previously Reported Amounts (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
General and administrative expenses $ 26,921 $ 29,916 $ 96,358 $ 94,799
As previously reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
General and administrative expenses   37,526   116,608
Reclassifications        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
General and administrative expenses   (7,610)   (21,809)
Services        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of revenue, exclusive of depreciation and amortization 86,745 74,769 255,769 219,819
Services | As previously reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of revenue, exclusive of depreciation and amortization   65,726   193,951
Services | Reclassifications        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of revenue, exclusive of depreciation and amortization   9,043   25,868
Products        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of revenue, exclusive of depreciation and amortization $ 14,247 17,988 $ 57,850 54,415
Products | As previously reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of revenue, exclusive of depreciation and amortization   19,421   58,474
Products | Reclassifications        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of revenue, exclusive of depreciation and amortization   $ (1,433)   $ (4,059)