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Summary of Significant Accounting Policies (Details 2) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Changes to the Company's accrual for product warranties    
Warranty Accrual, Balance at beginning of period $ 16,991 $ 16,295
Accruals for warranties 14,737 14,246
Foreign currency translation (409) 20
Payments / utilizations (15,278) (14,354)
Warranty Accrual, Balance at end of period $ 16,041 $ 16,207