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Commitments And Contingencies (Reconciliation Of Contingent Consideration Liability) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Business Combination, Contingent Consideration, Reconciliation of Change in Liability [Roll Forward]    
Balance at beginning of period $ 10,840 $ 8,129
Acquisitions 1,322 4,767
Payments (2,719) (3,963)
Accretion [1] 976 868
Fair value adjustments [1] 1,046 562
Balance at end of the period [2] 11,465 10,363
Less current portion in accrued expenses and other current liabilities (4,984) (2,681)
Total long-term portion in other long-term liabilities 6,481 $ 7,682
Contingent consideration, total remaining estimated payments $ 14,000  
[1] Recorded in selling, general and administrative expense in the Condensed Consolidated Statements of Income
[2] Amounts represent the fair value of estimated remaining payments. The total estimated remaining payments as of September 30, 2016 are $14.0 million. The liability for contingent consideration expires at various dates through September 2029. Certain of the contingent consideration arrangements are subject to a maximum payment amount, while the remaining arrangements have no maximum contingent consideration.