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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance at beginning of year $ 1,078 $ 785 $ 591
Additions 7,272 7,386 3,385
Amounts utilized (7,421) (7,093) (3,191)
Balance at end of year $ 929 $ 1,078 $ 785