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Schedule II-Valuation and Qualifying Accounts and Reserves Schedule II-Valuation and Qualifying Accounts and Reserves (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Allowance for Doubtful Accounts
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| Valuation and Qualifying Accounts Disclosure [Line Items] | |||
| Balance at Beginning of Period | $ 8,347 | $ 6,895 | $ 6,507 |
| Additions Charged to Costs and Expenses | 5,928 | 5,084 | 4,326 |
| Acquisitions and Other | 308 | 2,199 | 1,125 |
| Deductions | (5,113) | (5,831) | (5,063) |
| Balance at End of Period | 9,470 | 8,347 | 6,895 |
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Allowance for Estimated Returns, Discounts & Allowances
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| Valuation and Qualifying Accounts Disclosure [Line Items] | |||
| Balance at Beginning of Period | 22,804 | 18,185 | 15,802 |
| Additions Charged to Costs and Expenses | 714,880 | 668,936 | 541,314 |
| Acquisitions and Other | 1,151 | 2,754 | 1,061 |
| Deductions | (714,143) | (667,071) | (539,992) |
| Balance at End of Period | $ 24,692 | $ 22,804 | $ 18,185 |