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Revenue Recognition Revenue Recognition (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Revenue Recognition [Line Items]      
Revenue $ 2,720,764 $ 2,342,843  
Deferred Service-Type Warranty Revenue 22   $ 19
Deferred Revenue, Additions 10    
Deferred Revenue, Revenue Recognized (8)    
Reserve for Returns, net     (38,000)
Reserve for Variable Consideration 44,000   $ 78,000
Customer Refund Liability, Current      
Revenue Recognition [Line Items]      
Reserve for Returns, net 99,000    
Customer Returns Asset      
Revenue Recognition [Line Items]      
Reserve for Returns, net $ 53,000    
Maximum      
Revenue Recognition [Line Items]      
Service-Type Product Warranty Time Period 36    
Minimum      
Revenue Recognition [Line Items]      
Service-Type Product Warranty Time Period 6    
North America      
Revenue Recognition [Line Items]      
Revenue $ 1,329,843 1,208,240  
Europe      
Revenue Recognition [Line Items]      
Revenue 1,040,430 820,897  
Specialty      
Revenue Recognition [Line Items]      
Revenue 351,792 314,934  
Parts and Services      
Revenue Recognition [Line Items]      
Revenue 2,560,305 2,212,941  
Parts and Services | North America      
Revenue Recognition [Line Items]      
Revenue 1,172,585 1,079,875  
Parts and Services | Europe      
Revenue Recognition [Line Items]      
Revenue 1,037,046 819,167  
Parts and Services | Specialty      
Revenue Recognition [Line Items]      
Revenue 350,674 313,899  
Other Revenue      
Revenue Recognition [Line Items]      
Revenue $ 160,459 $ 129,902