SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES [Line Items]
Balance at Beginning of Period	$ 112	$ 120	$ 210
Charged (Credited) to Costs and Expenses	171	29	(49)
Deductions	94	37	41
Balance at End of Period	189	112	120
Discount Returns and Allowance [Member]
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES [Line Items]
Balance at Beginning of Period	158		196
Charged (Credited) to Costs and Expenses	28		(38)
Balance at End of Period	186		158
Doubtful Receivables Discounts Returns and Allowances [Member]
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES [Line Items]
Balance at Beginning of Period	270	278	406
Charged (Credited) to Costs and Expenses	199	29	(87)
Deductions	94	37	41
Balance at End of Period	375	270	278
Valuation Allowance of Deferred Tax Assets [Member]
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES [Line Items]
Balance at Beginning of Period	10,727	5,203	15,336
Charged (Credited) to Costs and Expenses	10,997	5,524	(10,133)
Balance at End of Period	$ 21,724	$ 10,727	$ 5,203