Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Changes in Level 3 Fair Values (Details)

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Fair Value Measurements - Changes in Level 3 Fair Values (Details) - Level 3 - Contingent Consideration - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 414 $ 541
Initial contingent consideration 0 812
Settlements through cash payments (247) 0
Net (gain) loss on change in fair value (115) 41
Balance at end of period $ 52 $ 1,394