Property and Equipment, Net (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Gross amount	$ 906,003		$ 811,636
Less accumulated depreciation and amortization	468,733		432,540
Total property and equipment, net	437,270	$ 379,096	379,096
Land and improvements
Property, Plant and Equipment [Line Items]
Gross amount	8,701		7,323
Buildings and improvements
Property, Plant and Equipment [Line Items]
Gross amount	190,809		180,185
Leasehold improvements
Property, Plant and Equipment [Line Items]
Gross amount	66,917		52,227
Machinery and equipment
Property, Plant and Equipment [Line Items]
Gross amount	299,204		284,375
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Gross amount	51,661		47,476
Computer hardware and software
Property, Plant and Equipment [Line Items]
Gross amount	218,150		206,580
Construction in progress
Property, Plant and Equipment [Line Items]
Gross amount	$ 70,561		$ 33,470