Property and Equipment, Net - Property and Equipment Table (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 344,310	$ 337,950
Less: Accumulated depreciation	167,340	160,480
Property and equipment, net	176,970	177,470
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	14,440	14,710
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	63,850	60,570
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 266,020	$ 262,670