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Commitments and Contingent Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Future minimum lease payments under operating leases      
2012 $ 16,983    
2013 11,929    
2014 9,803    
2015 7,219    
2016 5,659    
Thereafter 14,351    
Subtotal 65,944    
Sublease income (927)    
Total minimum lease payments 65,017    
Summary of changes in product warranties reserve:      
Warranty reserve, beginning of period 69,787 64,417 68,084
Provision 37,040 44,633 35,688
Payments (42,819) (39,263) (39,355)
Warranty reserve, end of period $ 64,008 $ 69,787 $ 64,417