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Accrued Expenses And Other Current Liabilities (Schedule Of Accrued Expenses And Other Current Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Payables and Accruals [Abstract]      
Employee compensation and benefits $ 21,473us-gaap_EmployeeRelatedLiabilitiesCurrent $ 18,583us-gaap_EmployeeRelatedLiabilitiesCurrent  
Current portion of accrued warranty 14,516us-gaap_ProductWarrantyAccrualClassifiedCurrent 11,731us-gaap_ProductWarrantyAccrualClassifiedCurrent 9,125us-gaap_ProductWarrantyAccrualClassifiedCurrent
Other 21,662us-gaap_OtherAccruedLiabilitiesCurrent 17,108us-gaap_OtherAccruedLiabilitiesCurrent  
Accrued expenses and other current liabilities $ 57,651us-gaap_AccruedLiabilitiesCurrent $ 47,422us-gaap_AccruedLiabilitiesCurrent