SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	$ 10,232	$ 9,283	$ 8,488
Additions Charged to Costs and Expenses	1,450	949	941
Deductions	232		(146)
Balance at End of Year	11,914	10,232	9,283
Inventory Valuation and Obsolescence
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	10,138	9,189	8,248
Additions Charged to Costs and Expenses	1,450	949	941
Balance at End of Year	11,588	10,138	9,189
Allowance for Doubtful Accounts
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	94		240
Deductions	232		(146)
Balance at End of Year	$ 326		$ 94