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Allowance for Doubtful Accounts, Sales Returns and Discounts (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Balance at beginning of year $ 785 $ 591 $ 970
Additions 7,386 3,385 4,551
Amounts utilized (7,093) (3,191) (4,930)
Balance at end of year $ 1,078 $ 785 $ 591