CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Balance Sheet Parentheticals [Line Items]
Preferred stock par value	$ 0.01	$ 0.01
Preferred stock shares authorized	5,000,000	5,000,000
Preferred stock shares issued	0	0
Common stock in treasury, shares	17,745,039	12,897,610
Provision For Sales Discounts And Chargebacks	$ 6,187	$ 3,981
Class A [Member]
Balance Sheet Parentheticals [Line Items]
Common Stock Shares Issued and Outstanding	74,740,324	71,863,191
Common Stock Par Value	$ 0.014	$ 0.014
Common Stock Shares Authorized	150,000,000	150,000,000
Class B [Member]
Balance Sheet Parentheticals [Line Items]
Common Stock Shares Issued and Outstanding	0	0
Common Stock Par Value	$ 0.014	$ 0.014
Common Stock Shares Authorized	1,000,000	1,000,000