Commitments And Contingencies (Reconciliation Of Contingent Consideration Liability) (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Dec. 31, 2015	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Business Combination, Contingent Consideration, Reconciliation of Change in Liability
Balance at beginning of period			$ 8,129	[1]	$ 7,414	[1]	$ 11,519
Acquisitions			4,766		3,370		0
Payments			(3,974)		(3,739)		(5,456)
Accretion	[2]		1,196		1,075		1,308
Fair value adjustments	[2]	$ 723	723		9		43
Balance at end of the period	[1]	10,840	10,840		8,129		7,414
Less current portion in accrued expenses and other current liabilities		(3,877)	(3,877)		(3,622)		(3,462)
Total long-term portion in other long-term liabilities		6,963	$ 6,963		$ 4,507		$ 3,952
Contingent consideration, total remaining estimated payments		$ 14,400

[1] Amounts represent the fair value of estimated remaining payments. The total estimated remaining undiscounted payments as of December 31, 2015 are $14.4 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.

[2] Recorded in selling, general and administrative expense in the Consolidated Statements of Income