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Significant Accounting Policies (Schedule Of Warranty Liability) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Significant Accounting Policies [Abstract]    
Balance, at January 1 $ 176,831 $ 164,778
Warranties issued during the year 81,952 75,434
Reduction due to warranties forfeited or claimed during the year (69,070) (63,381)
Balance, at December 31 $ 189,713 $ 176,831