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Schedule II-Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for doubtful accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 185 $ 277 $ 209
Accrued Legal Expense (Income) 115   68
Deductions   92 [1]  
Balance at End of Period 300 185 277
Allowance for discounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 807 627 492
Accrued Legal Expense (Income) 10,679 6,148 5,520
Deductions 10,661 [2] 5,968 [2] 5,385 [2]
Balance at End of Period 825 807 627
Excess and obsolete inventory reserve [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 1,311 1,545 2,727
Accrued Legal Expense (Income) 761 (234) (1,057)
Deductions 343 [3] 0 [3] 125 [3]
Balance at End of Period $ 1,729 $ 1,311 $ 1,545
[1] Accounts written off
[2] Discounts taken
[3] Inventory written off