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Commitments and Contingencies (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
claim
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
claim
Sep. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Loss Contingencies [Line Items]                
Letters of credit outstanding $ 282,300   $ 282,300     $ 249,700    
Surety bonds outstanding 1,800,000   $ 1,800,000     1,500,000    
Maximum product warranty in years     10 years          
Self-insurance liabilities $ 624,662 $ 652,546 $ 624,662 $ 652,546 $ 620,617 $ 641,779 $ 640,014 $ 709,798
Incurred but not reported percentage of liability reserves 70.00%   70.00%     68.00%    
Adjustments to previously recorded reserves $ (1,349) 0 $ (56,567) (59,362)        
ROU assets 78,000   78,000     $ 71,300    
Operating lease liabilities 96,932   96,932     91,400    
Additional ROU assets under operating leases 2,100   15,200 13,000        
Payments on lease liabilities 5,100 4,800 15,600 14,800        
Total lease expense 10,600 9,600 31,200 28,200        
Variable lease costs 1,600 1,500 5,600 4,900        
Short-term lease costs $ 3,700 $ 2,600 $ 9,700 $ 6,600        
Number of individual claims managed | claim 1,000   1,000          
Other Assets                
Loss Contingencies [Line Items]                
Recorded insurance receivables $ 67,800   $ 67,800     $ 69,500