SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	$ 9,283	$ 8,488	$ 7,588
Additions Charged to Costs and Expenses	949	941	900
Deductions		(146)
Balance at End of Year	10,232	9,283	8,488
Allowance for inventory obsolescence
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	9,189	8,248	7,541
Additions Charged to Costs and Expenses	949	941	707
Balance at End of Year	10,138	9,189	8,248
Allowance for doubtful accounts receivable
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year		240	47
Additions Charged to Costs and Expenses			193
Deductions		(146)
Balance at End of Year	$ 94	$ 94	$ 240