Schedule II - Valuation and Qualifying Accounts (Details) (Inventory Valuation Reserve [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Inventory Valuation Reserve [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 1,659	$ 1,681
Additions Charged to Expenses	607	1,887
(Deductions)	(1,069)	(1,909)
Balance at End of Year	$ 1,197	$ 1,659