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Fair Value Measurements Reconciliation of Fair Value Measurements of Liability for Future Consideration Payments (Details) - Acquisition-related Future Consideration Liabilities [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance $ 1,909 $ 6,489 $ 11,759
New acquisition adjustment [1] 2,090 0 330
Changes in fair value [2] 415 (1,589) (941)
Contingent consideration payments (2,253) (2,991) (4,659)
Ending balance $ 2,161 $ 1,909 $ 6,489
[1] Amounts include the preliminary fair value estimate of the contingent payment liability recorded in connection with new acquisitions or the revision thereof upon finalization of the valuation process related to initial purchase accounting.
[2] Amounts were included as Operating Expenses – Other on the Consolidated Statements of Income.