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Revenue - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Unbilled receivables, net | $ 45,961 |  | $ 45,961 |  | $ 41,255
Contract with customer, liability | 4,900 |  | 4,900 |  | $ 5,000
Contract with customer, liability, revenue recognized |  |  | 2,000 | $ 7,700 |
Revenue, remaining performance obligation | $ 269,000 |  | $ 269,000 |  |
Sales Revenue, Net | Product Concentration Risk | Transferred over Time |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Concentration risk, percentage | 57.00% | 57.00% | 57.00% | 57.00% |
Sales Revenue, Net | Product Concentration Risk | Transferred at Point in Time |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Concentration risk, percentage | 43.00% | 43.00% | 43.00% | 43.00% |

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