Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 570,162	$ 546,848
Less accumulated depreciation	(306,166)	(275,063)
Property and equipment, net	263,996	271,785
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	22,765	22,326
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 167,645	162,701
Building | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful life	30 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 275,688	258,023
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful life	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful life	7 years
Office equipment and other
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 104,064	$ 103,798
Office equipment and other | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful life	3 years
Office equipment and other | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful life	10 years