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Fair Value Measurements - Contingent consideration Rollforward (Details) - Acquisition related contingent consideration - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Change in fair value using significant unobservable inputs (Level 3):    
Balance at beginning of period $ 5,241 $ 8,378
Fair value of cash consideration paid (1,895) (877)
Fair value of equity consideration paid   (201)
Adjustments to fair value measurement (338) (2,059)
Balance at end of period $ 3,008 $ 5,241