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Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Intangibles	$ (73,921)	$ (88,832)
Depreciation expense	(9,851)	(14,383)
Allowance for doubtful accounts	2,615	3,185
Employee related accruals	2,616	10,156
Stock-based compensation	4,766	9,300
Other	4,339	6,239
Net operating loss carryforwards	1,255	1,262
Valuation allowance	(1,255)	(1,209)
Total deferred income tax assets (liabilities)	$ (69,436)	$ (74,282)

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