Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Intangibles	$ (88,832)	$ (70,588)
Depreciation expense	(14,383)	(14,369)
Allowance for doubtful accounts	3,185	2,607
Employee related accruals	10,156	7,573
Workers’ compensation loss reserves	757	720
Stock-based compensation	9,300	7,354
Other	5,482	5,061
Net operating loss carryforwards	1,262	1,147
Valuation allowance	(1,209)	(1,044)
Total deferred income tax assets (liabilities)	$ (74,282)	$ (61,539)