Property And Equipment, Net (Schedule Of Property And Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Gross amount	$ 678,624	$ 603,935
Less accumulated depreciation and amortization	345,598	300,348
Total property and equipment, net	333,026	303,587
Land And Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross amount	7,357	7,417
Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross amount	162,146	159,298
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross amount	40,526	45,655
Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross amount	224,100	183,575
Office Furniture And Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross amount	39,334	35,696
Computer Hardware And Software [Member]
Property, Plant and Equipment [Line Items]
Gross amount	169,615	151,404
Construction In Progress [Member]
Property, Plant and Equipment [Line Items]
Gross amount	$ 35,546	$ 20,890