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Fair Value Measurements (Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Contingent consideration for acquisitions        
Balance at beginning of period $ (17,326) $ (3,000) $ (3,000) $ (3,667)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 0 0 13,814 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Payments 0 0 0 (691)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 896 0 1,408 0
Foreign currency translation adjustment 0 0 0 (24)
Balance at end of period $ (18,222) $ (3,000) $ (18,222) $ (3,000)