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Schedule II Valuation and Qualifying Accounts (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Valuation and Qualifying Accounts [Roll Forward]      
Balance at beginning of year $ 6,124,000 $ 6,709,000 $ 6,779,000
Charged to costs and expenses 15,443,000 13,295,000 12,912,000
Other 0 453,000 526,000
Deductions 14,598,000 14,333,000 13,508,000
Balance at end of year 6,969,000 6,124,000 6,709,000
Allowances acquired through acquisition 362,000    
Transfer from noncurrent for receivables with extended terms 164,000    
Allowance for Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts [Roll Forward]      
Balance at beginning of year 4,944,000 5,386,000 5,422,000
Charged to costs and expenses 641,000 (728,000) (484,000)
Other 0 [1] 414,000 [2] 526,000
Deductions 57,000 128,000 78,000
Balance at end of year 5,528,000 4,944,000 5,386,000
Allowance for Discounts [Member]
      
Valuation and Qualifying Accounts [Roll Forward]      
Balance at beginning of year 1,180,000 1,323,000 1,357,000
Charged to costs and expenses 14,802,000 14,023,000 13,396,000
Other 0 [1] 39,000 0
Deductions 14,541,000 14,205,000 13,430,000
Balance at end of year 1,441,000 1,180,000 1,323,000
Allowance for Sales Returns [Member]
      
Valuation and Qualifying Accounts [Roll Forward]      
Balance at beginning of year 29,033,000 25,074,000 23,207,000
Charged to costs and expenses 114,958,000 112,519,000 99,994,000
Other 0 [1] 4,128,000 [1] 172,000
Deductions 112,527,000 112,688,000 98,299,000
Balance at end of year $ 31,464,000 $ 29,033,000 $ 25,074,000
[1] Allowances acquired through acquisition.
[2] Allowances acquired through acquisition: $ 362,000 Transfer from noncurrent for receivables with extended terms: 164,000 Total: $ 526,000