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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 395 $ 525 $ 700
Additions to charged to costs and expenses 120 165 167
Deductions Describe 165 [1],[2] 295 [1],[2] 342 [1],[2]
Balance at end of period 350 395 525
Reserve for Cancelled Sales and Allowances [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 1,152 1,100 1,210
Additions to charged to costs and expenses 10,402 9,027 8,193
Deductions Describe 10,277 [1],[2] 8,975 [1],[2] 8,303 [1],[2]
Balance at end of period $ 1,277 $ 1,152 $ 1,100
[1] Reserve for cancelled sales and allowances: impact of sales cancelled after delivery plus amount of allowance given to customers.
[2] Allowance for doubtful accounts: uncollectible accounts written off, net of recoveries.