Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property and equipment [Abstract]
Property and equipment, gross	$ 176,936	$ 172,655
Accumulated depreciation and amortization	(117,933)	(112,072)
Total	59,003	60,583
Minimum [Member]
Property and equipment [Abstract]
Useful life	3 years
Maximum [Member]
Property and equipment [Abstract]
Useful life	30 years
Land and improvements [Member]
Property and equipment [Abstract]
Property and equipment, gross	5,853	6,295
Land and improvements [Member] | Minimum [Member]
Property and equipment [Abstract]
Useful life	10 years
Land and improvements [Member] | Maximum [Member]
Property and equipment [Abstract]
Useful life	15 years
Buildings and improvements [Member]
Property and equipment [Abstract]
Property and equipment, gross	18,035	17,917
Buildings and improvements [Member] | Minimum [Member]
Property and equipment [Abstract]
Useful life	15 years
Buildings and improvements [Member] | Maximum [Member]
Property and equipment [Abstract]
Useful life	30 years
Machinery and equipment [Member]
Property and equipment [Abstract]
Property and equipment, gross	76,751	77,808
Machinery and equipment [Member] | Minimum [Member]
Property and equipment [Abstract]
Useful life	3 years
Machinery and equipment [Member] | Maximum [Member]
Property and equipment [Abstract]
Useful life	7 years
Leasehold improvements [Member]
Property and equipment [Abstract]
Useful life of leasehold improvements	Life of lease
Property and equipment, gross	22,174	21,478
Computer software and licenses [Member]
Property and equipment [Abstract]
Property and equipment, gross	54,123	49,157
Interest capitalized	$ 195	$ 846
Computer software and licenses [Member] | Minimum [Member]
Property and equipment [Abstract]
Useful life	3 years
Computer software and licenses [Member] | Maximum [Member]
Property and equipment [Abstract]
Useful life	7 years