SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for doubtful accounts
Valuation and qualifying accounts
Balance at beginning of Year	$ 991	$ 1,344	$ 4,667
Charged to Costs and Expenses	355	67	(81)
Deductions	59	420	3,242
Balance at End of Year	1,288	991	1,344
Allowance for sales discounts
Valuation and qualifying accounts
Balance at beginning of Year	1,231	1,181	1,908
Charged to Costs and Expenses	401	50	794
Deductions			1,521
Balance at End of Year	1,632	1,231	1,181
Allowance for deferred tax assets
Valuation and qualifying accounts
Balance at beginning of Year	6,279	7,167	4,888
Charged to Costs and Expenses	3,600	1,081	3,344
Deductions	159	1,970	1,065
Balance at End of Year	$ 9,720	$ 6,279	$ 7,167