Property And Equipment, Net (Schedule Of Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Gross amount	$ 603,935	$ 550,015
Less accumulated depreciation and amortization	300,348	268,801
Total property and equipment, net	303,587	281,214
Land And Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross amount	7,417	7,471
Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross amount	159,298	158,382
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross amount	45,655	39,266
Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross amount	183,575	162,144
Office Furniture And Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross amount	35,696	35,271
Computer Hardware And Software [Member]
Property, Plant and Equipment [Line Items]
Gross amount	151,404	136,008
Construction In Progress [Member]
Property, Plant and Equipment [Line Items]
Gross amount	$ 20,890	$ 11,473