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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of other assets | $ 211 | $ 57 |
Contingent Receivable | Contingent Consideration |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gain (loss) on contingent receivable | 20 | (53) |
Payment received on contingent receivable |  | $ 153 |
Other long-term obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration liability, noncurrent | 59,200 |  | $ 58,500
Accrued expenses |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration liability, current | $ 23,300 |  | $ 23,800

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