Property And Equipment, Net (Schedule Of Property And Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Gross amount	$ 742,592	$ 678,624
Less accumulated depreciation and amortization	385,170	345,598
Total property and equipment, net	357,422	333,026
Land And Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross amount	7,255	7,357
Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross amount	171,455	162,146
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross amount	44,568	40,526
Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross amount	262,718	224,100
Office Furniture And Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross amount	42,124	39,334
Computer Hardware And Software [Member]
Property, Plant and Equipment [Line Items]
Gross amount	189,327	169,615
Construction In Progress [Member]
Property, Plant and Equipment [Line Items]
Gross amount	$ 25,145	$ 35,546