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Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Debt Instrument [Line Items]        
Other notes payable $ 44,136,000 $ 44,136,000   $ 53,381,000
Debt instrument term   3 years    
Line of Credit Facility, Current Borrowing Capacity 1,000,000,000.0 $ 1,000,000,000.0    
Maximum borrowing capacity 1,500,000,000 1,500,000,000    
Borrowings under revolving credit facility   700,000,000 $ 0  
Letters of credit outstanding 256,100,000 256,100,000   262,800,000
Line of credit facility, remaining borrowing capacity 43,900,000 43,900,000   737,200,000
Long-term line of credit 270,000,000 270,000,000   326,573,000
Revolving Credit Facility Accordion Feature        
Debt Instrument [Line Items]        
Maximum additional issuance   500,000,000.0    
Revolving Credit Facility        
Debt Instrument [Line Items]        
Borrowings under revolving credit facility 700,000,000.0      
Line of credit, current 700,000,000.0 700,000,000.0   0
Line of Credit | Financial Services        
Debt Instrument [Line Items]        
Long-term line of credit 270,000,000.0 270,000,000.0   $ 326,600,000
Line of Credit | Amendment Effective September 24, 2018 through and including December 25, 2018 | Financial Services        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 270,000,000.0 $ 270,000,000.0    
Maximum        
Debt Instrument [Line Items]        
Stated interest rate 8.00% 8.00%