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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Unbilled receivables, net | $ 41,255 | $ 42,577 |  | $ 45,961
Contract with customer, liability | 5,000 |  |  | $ 9,800
Contract with customer, liability, revenue recognized | $ 7,900 |  |  |
Concentration risk, percentage | 100.00% | 100.00% | 100.00% |
Revenue, remaining performance obligation | $ 290,000 |  |  |
Sales Revenue, Net | Product Concentration Risk | Transferred over Time |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Concentration risk, percentage | 57.00% |  |  |
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% |  |  |

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