Property and Equipment, Net - Property and Equipment Table (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 419,440	$ 398,060
Less: Accumulated depreciation	213,290	213,030
Property and equipment, net	206,150	185,030
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,520	6,410
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	61,960	59,610
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 351,960	$ 332,040