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Contingencies (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Contingencies [Abstract]      
Rent expense $ 39,800,000 $ 26,800,000 $ 29,700,000
Total future minimum property lease commitments 112,700,000    
Future minimum lease payments due 2014 33,600,000    
Future minimum lease payments due 2015 28,500,000    
Future minimum lease payments due 2016 23,000,000    
Future minimum lease payments due 2017 15,800,000    
Future minimum lease payments due 2018 7,300,000    
Future minimum lease payments due thereafter 4,800,000    
Product Warranty Disclosure [Abstract]      
Balance at beginning of year 9,755,000 8,147,000 7,038,000
Additions charged to costs and expenses 20,387,000 11,845,000 8,846,000
Deductions 15,697,000 10,287,000 7,716,000
Other (109,000) 50,000 (21,000)
Balance at end of year 14,336,000 9,755,000 8,147,000
Outstanding surety bonds $ 410,000,000