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Schedule II Valuation and Qualifying Accounts (Details) (USD $) | 12 Months Ended
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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

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- Definition Allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to acquisition. + References No definition available. + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to noncurrent for receivables with extended terms. + References No definition available. + Details
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