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Basis of Presentation - Reclassifications to Previously Reported Amounts (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
General and administrative expenses | $ 35,411 | $ 32,096
As previously reported |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
General and administrative expenses |  | 38,730
Reclassifications |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
General and administrative expenses |  | (6,634)
Services |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Cost of revenues | 83,239 | 70,962
Services | As previously reported |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Cost of revenues |  | 63,210
Services | Reclassifications |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Cost of revenues |  | 7,752
Products |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Cost of revenues | $ 20,128 | 17,629
Products | As previously reported |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Cost of revenues |  | 18,747
Products | Reclassifications |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Cost of revenues |  | $ (1,118)

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