Property and Equipment, Net - Property and Equipment Table (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 427,770	$ 419,440
Less: Accumulated depreciation	219,410	213,290
Property and equipment, net	208,360	206,150
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,530	5,520
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	62,520	61,960
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 359,720	$ 351,960