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Fair Value Measurements - Liability Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - Contingent Consideration - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 1,949 $ 2,507 $ 1,886 $ 2,526
Contingent consideration liability recorded as the result of acquisitions (see Note 5) 270 0 270 0
Fair value adjustments recorded to income during the period (58) (773) 185 (754)
Contingent payments made (14) (17) (194) (55)
Ending balance $ 2,147 $ 1,717 $ 2,147 $ 1,717