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Schedule II Valuation and Qualifying Accounts (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Valuation and Qualifying Accounts [Roll Forward]      
Balance at beginning of year $ 6,709,000 $ 6,779,000 $ 6,962,000
Charged to costs and expenses 13,295,000 12,912,000 13,161,000
Other 453,000 526,000 0
Deductions 14,333,000 13,508,000 13,344,000
Balance at end of year 6,124,000 6,709,000 6,779,000
Allowances acquired through acquisition 362,000,000    
Transfer from noncurrent for receivables with extended terms 164,000,000    
Allowance for Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts [Roll Forward]      
Balance at beginning of year 5,386,000 5,422,000 5,363,000
Charged to costs and expenses (728,000) (484,000) 502,000
Other 414,000 [1] 526,000 [2] 0
Deductions 128,000 78,000 443,000
Balance at end of year 4,944,000 5,386,000 5,422,000
Allowance for Discounts [Member]
      
Valuation and Qualifying Accounts [Roll Forward]      
Balance at beginning of year 1,323,000 1,357,000 1,599,000
Charged to costs and expenses 14,023,000 13,396,000 12,659,000
Other 39,000 [1] 0 0
Deductions 14,205,000 13,430,000 12,901,000
Balance at end of year 1,180,000 1,323,000 1,357,000
Allowance for Sales Returns [Member]
      
Valuation and Qualifying Accounts [Roll Forward]      
Balance at beginning of year 25,074,000 23,207,000 20,442,000
Charged to costs and expenses 112,519,000 99,994,000 89,211,000
Other 4,128,000 [1] 172,000 [1] 0
Deductions 112,688,000 98,299,000 86,446,000
Balance at end of year 29,033,000 25,074,000 23,207,000
Allowance for Inventory Valuation [Member]
      
Valuation and Qualifying Accounts [Roll Forward]      
Balance at beginning of year 39,524,000 38,577,000 36,313,000
Charged to costs and expenses 4,921,000 4,504,000 7,403,000
Other 2,434,000 [1] 1,394,000 [1] 0
Deductions 4,981,000 4,951,000 5,139,000
Balance at end of year $ 41,898,000 $ 39,524,000 $ 38,577,000
[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