Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Changes to the Company's accrual for product warranties
Warranty Accrual, Balance at beginning of period	$ 15,680	$ 15,856
Accruals for warranties	12,164	11,712
Foreign currency translation	291	(196)
Payments / utilizations	(11,399)	(11,984)
Warranty Accrual, Balance at end of period	$ 16,736	$ 15,388

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

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Increase or Decrease in standard product warranty liability due to currency translation. Does not include any Increase or Decrease in an extended product warranty liability due to currency translation.

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Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties.

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Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to extended product warranties.

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