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Commitments and Contingencies (Narrative) (Details)
$ in Thousands
 3 Months Ended
Dec. 17, 2018
USD ($)
party
Mar. 31, 2020
USD ($)
claim
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]          
Loss contingency accrual   $ 25,200   $ 25,200  
Letters of credit outstanding   256,100   262,800  
Surety bonds outstanding   $ 1,400,000   1,400,000  
Maximum product warranty in years   10 years      
Number of individual claims managed | claim   1,000      
Self-insurance liabilities   $ 719,172 $ 729,170 $ 709,798 $ 737,013
Incurred but not reported percentage of liability reserves   67.00%   68.00%  
Adjustments to previously recorded reserves   $ 1,300 (3,875)    
Write-off of insurance receivables     11,600    
ROU assets   76,200   $ 70,000  
Operating lease liabilities   96,776   91,400  
Additional ROU assets under operating leases   9,600 7,800    
Payments on lease liabilities   5,900 5,800    
Total lease expense   9,900 8,800    
Variable lease costs   1,900 1,700    
Short-term lease costs   2,200 $ 2,200    
Other Assets          
Loss Contingencies [Line Items]          
Recorded insurance receivables   $ 112,500   $ 118,400  
Lehman Complaint | CTX Mortgage Company LLC          
Loss Contingencies [Line Items]          
Number of mortgage originators involved in bankruptcy claim | party 100        
Damages sought, value $ 261,000