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Contingencies (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Contingencies [Abstract]      
Rent expense $ 26,800,000 $ 29,700,000 $ 29,100,000
Total future minimum property lease commitments 78,000,000    
Future minimum lease payments due 2013 23,400,000    
Future minimum lease payments due 2014 17,400,000    
Future minimum lease payments due in 2015 14,300,000    
Future minimum lease payments due in 2016 12,500,000    
Future minimum lease payments due in 2017 7,400,000    
Future minimum lease payments due thereafter 3,000,000    
Product Warranty Disclosure [Abstract]      
Balance at beginning of year 8,147,000 7,038,000 7,341,000
Additions charged to costs and expenses 11,845,000 8,846,000 5,671,000
Deductions 10,287,000 7,716,000 5,895,000
Other 50,000 (21,000) (79,000)
Balance at end of year 9,755,000 8,147,000 7,038,000
Outstanding surety bonds $ 402,000,000