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Revenue Recognition (Analysis of Product Return Liability) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Aggregate product return rate	1.70%	1.30%
Return accrual included in accounts payable and accrued liabilities	$ 14,823		$ 10,190
Return accrual included in other long-term liabilities	4,900		$ 4,000
Product returns
Beginning balance	14,204	$ 10,339
Provision for product returns	11,714	9,084
Credits issued to third parties	(6,183)	(6,731)
Ending balance	$ 19,735	$ 12,692

X

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date for estimated refunds due to goods returned by customers (other than under warranty provisions). For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Represents the aggregate product return rate percentage of qualified sales.

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- Definition

Amount of valuation and qualifying accounts and reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of decrease in valuation and qualifying accounts and reserves.

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