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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for Doubtful Accounts [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 525,000 $ 700,000 $ 1,000,000
Additions to charged to costs and expenses 165,000 167,000 380,000
Deductions Describe 295,000 [1],[2] 342,000 [1],[2] 680,000 [1],[2]
Balance at end of period 395,000 525,000 700,000
Reserve for Cancelled Sales and Allowances [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 1,100,000 1,210,000 1,220,000
Additions to charged to costs and expenses 9,027,000 8,193,000 8,234,000
Deductions Describe 8,975 [1],[2] 8,303,000 [1],[2] 8,244,000 [1],[2]
Balance at end of period $ 1,152,000 $ 1,100,000 $ 1,210,000
[1] Allowance for doubtful accounts: uncollectible accounts written off, net of recoveries.
[2] Reserve for cancelled sales and allowances: impact of sales cancelled after delivery plus amount of allowance given to customers.