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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of other assets $ 57 $ 18  
Other Payments | Contingent Consideration      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Remaining contingent receivable asset 553   $ 760
Contingent Receivable | Contingent Consideration      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Gain (loss) on contingent receivable (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 10,700   10,700
Accrued expenses      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent consideration liability, current 254   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 259   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 $ 294   $ 441