Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property, plant and equipment - gross	$ 123,569	$ 124,296
Less accumulated depreciation and amortization, including accumulated amortization of capitalized leases	81,236	78,459
Total property, plant and equipment, net	42,333	45,837
Depreciation and amortization	9,979	9,182	8,441
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment - gross	4,764	4,760
Improvements To Land And LeaseHolds [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment - gross	23,187	22,570
Building [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment - gross	13,715	10,748
Machinery And Equipment, Including Equipment Under Capitalized Leases [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment - gross	80,120	81,933
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment - gross	$ 1,783	$ 4,285