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Commitments and Contingencies (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
claim
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
claim
Sep. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]                
Cost of Property Repairs and Maintenance   $ 9,000   $ 14,800        
Loss contingency accrual $ 11,900   $ 11,900     $ 25,200    
Letters of credit outstanding 250,700   250,700     262,800    
Surety bonds outstanding $ 1,500,000   $ 1,500,000     1,400,000    
Comprehensive Limited Warranty     1 year          
Maximum product warranty in years     10 years          
Number of individual claims managed | claim 1,000   1,000          
Self-insurance liabilities $ 652,546 725,318 $ 652,546 725,318 $ 640,014 $ 709,798 $ 716,218 $ 737,013
Incurred but not reported percentage of liability reserves 68.00%   68.00%     68.00%    
Adjustments to previously recorded reserves $ 0 (1,700) $ (59,362) (18,338)        
Write-off of insurance receivables       24,000        
ROU assets 73,500   73,500     $ 70,000    
Operating lease liabilities 94,308   94,308     91,400    
Additional ROU assets under operating leases   4,000 13,000 12,800        
Payments on lease liabilities 4,800 5,900 14,800 17,400        
Total lease expense 9,600 9,100 28,200 27,000        
Variable lease costs 1,500 1,700 4,900 4,900        
Short-term lease costs 2,600 $ 2,400 6,600 $ 7,300        
Other Assets                
Loss Contingencies [Line Items]                
Recorded insurance receivables $ 82,000   $ 82,000     $ 118,400