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Significant Accounting Policies (Schedule Of Warranty Liability) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Significant Accounting Policies [Abstract]    
Balance, at January 1 $ 164,778 $ 126,783
Warranties issued during the year 62,771 69,213
Warranties related to acquisitions   19,015
Reduction due to warranties forfeited or paid during the year (63,381) (50,233)
Balance, at December 31 $ 164,168 $ 164,778