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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of other assets | $ 814 | $ 988 | $ 101
Other Payments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Remaining contingent receivable asset | 607 |  |
Other Payments | Contingent Consideration |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Remaining contingent receivable asset |  | 760 |
Contingent Receivable | Contingent Consideration |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Payments collected | 153 |  |
Gain (loss) on contingent receivable |  | (232) |
Other Long-term Obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration liability, noncurrent | 58,500 | 10,700 |
Accrued expenses |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration liability, current | 23,800 | 289 |
Other assets (long-term) | Contingent Receivable | Contingent Consideration |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Remaining contingent receivable asset |  | 319 |
Other Current Assets | Contingent Receivable | Contingent Consideration |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Remaining contingent receivable asset | $ 607 | $ 441 |

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