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Fair Value Measurements - Liabilities (Details) - Recurring - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair Value Measurements    
Acquisition-related contingent consideration - short-term $ 1,547 $ 1,493
Acquisition-related contingent consideration - long-term   1,515
Liabilities 1,547 3,008
Level 3    
Fair Value Measurements    
Acquisition-related contingent consideration - short-term 1,547 1,493
Acquisition-related contingent consideration - long-term   1,515
Liabilities $ 1,547 $ 3,008