Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 275		$ 302		$ 306
Charged to Costs and Expenses	73		1		(4)
Deductions	(133)	[1]	(28)	[1]	0	[1]
Balance at End of Period	215		275		302
Allowance for Ship and Debit Credits [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	24,481		16,967		9,467
Charged to Costs and Expenses	142,742		130,993		70,484
Deductions	(147,759)	[2]	(123,479)	[2]	(62,984)	[2]
Balance at End of Period	$ 19,464		$ 24,481		$ 16,967

[1] Deductions relate to amounts written off against the allowances for doubtful accounts.

[2] Deductions relate to ship and debit credits issued which adjust the sell-in price from the standard distribution price to the pre-approved lower price. Refer to Note 2, Summary of Significant Accounting Policies, for the Company's revenue recognition policy, including the Company's accounting for ship and debit claims.