SCHEDULE II - CONSOLIDATED VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Activity in valuation and qualifying accounts
Balance at Beginning of Year	$ 29,385	$ 3,722	$ 3,491
Charged (Credited) to Costs and Expenses	3,406	25,684	360
Deductions		(21)	(129)
Balance at End of Year	32,791	29,385	3,722
Allowance for doubtful accounts
Activity in valuation and qualifying accounts
Balance at Beginning of Year	557	402	290
Charged (Credited) to Costs and Expenses	82	155	112
Balance at End of Year	639	557	402
Allowance for sales returns and adjustments
Activity in valuation and qualifying accounts
Balance at Beginning of Year	337	75	15
Charged (Credited) to Costs and Expenses	(258)	262	60
Balance at End of Year	79	337	75
Income tax valuation allowance
Activity in valuation and qualifying accounts
Balance at Beginning of Year	28,491	3,245	3,186
Charged (Credited) to Costs and Expenses	3,582	25,267	188
Deductions		(21)	(129)
Balance at End of Year	$ 32,073	$ 28,491	$ 3,245