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Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Inventories [Abstract] |  |  |
Reserves for obsolete inventory | $ 5,500,000 | $ 7,100,000 |
Raw materials | 32,332,000 | 24,668,000 |
Finished goods | 103,542,000 | 87,443,000 |
Inventories | 135,874,000 | 112,111,000 |
Revenue recognition [Abstract] |  |  |
Accrued reserve for product returns | 6,200,000 | 5,200,000 |
Sales returns | 56,100,000 | 56,500,000 | 55,400,000
Fair value of financial instruments [Abstract] |  |  |
Long-term debt, fair value | 199,500,000 | 145,000,000 |
Advertising expense [Abstract] |  |  |
Advertising expense incurred | 5,100,000 | 2,300,000 | 2,100,000
Selling expenses [Abstract] |  |  |
Number of levels of executive distributors | 6 |  |
Research and development [Abstract] |  |  |
Research and development expense | 14,900,000 | 13,600,000 | 12,400,000
Deferred tax assets and liabilities [Abstract] |  |  |
Net deferred tax assets | 35,635,000 | 51,449,000 |
Reconciliation of Unrecognized Tax Benefits [Abstract] |  |  |
Gross Balance, Beginning | 7,387,000 | 14,821,000 | 28,275,000
Increases related to prior year tax positions | 0 | (7,138,000) | (1,206,000)
Increases related to current year tax positions | 2,430,000 | 1,415,000 | 2,236,000
Settlements | 0 | (499,000) | 0
Decreases due to lapse of statutes of limitations | (854,000) | (1,255,000) | (15,395,000)
Currency adjustments | 82,000 | 43,000 | 911,000
Gross Balance, Ending | 9,045,000 | 7,387,000 | 14,821,000
Unrecognized tax benefits that would impact effective tax rate | 3,800,000 | 3,100,000 |
Estimate of change in gross unrecognized tax benefits, net of foreign adjustments, minimum | 2,000,000 |  |
Estimate of change in gross unrecognized tax benefits, net of foreign currency adjustments, maximum | 4,000,000 |  |
Interest and penalties expenses/(benefits) | 300,000 | 800,000 | (1,700,000)
Accrued interest and penalties related to uncertain tax positions | $ 1,100,000 | $ 800,000 | $ 1,600,000
Leasehold Improvements [Member] |  |  |
Property and equipment [Abstract] |  |  |
Estimated useful life description | Shorter of estimated useful life or lease term |  |

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