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Debt (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Debt Instrument [Line Items]          
Repayments of notes payable     $ 4,152,000 $ 797,395,000  
Loss on debt retirement $ 0 $ 0 0 61,469,000  
Other notes payable 40,533,000   40,533,000   $ 40,185,000
Current borrowing capacity 1,300,000,000   1,300,000,000    
Maximum borrowing capacity 1,800,000,000   1,800,000,000    
Letters of credit outstanding 347,000,000   347,000,000   298,800,000
Line of credit facility, remaining borrowing capacity 903,000,000   903,000,000   701,200,000
Long-term line of credit 442,816,000   442,816,000   626,123,000
Joint Venture Debt | Joint Venture          
Debt Instrument [Line Items]          
Joint venture debt outstanding $ 70,700,000   $ 70,700,000    
Joint Venture Debt | Joint Venture | Joint Venture with 50% Interest          
Debt Instrument [Line Items]          
Ownership interest 50.00%   50.00%    
Joint Venture Debt | Joint Venture | Joint Venture with 50% Interest          
Debt Instrument [Line Items]          
Joint venture debt outstanding $ 42,400,000   $ 42,400,000    
Notes Payables          
Debt Instrument [Line Items]          
Other notes payable 40,500,000   $ 40,500,000   40,200,000
Debt instrument term     3 years    
Notes payable issued to acquire land inventory     $ 4,500,000 29,400,000  
Notes Payables | Notes Payable Maturing in 2021          
Debt Instrument [Line Items]          
Repayments of notes payable       426,000,000  
Notes Payables | Notes Payable Maturing in 2026          
Debt Instrument [Line Items]          
Repayments of notes payable       200,000,000  
Notes Payables | Notes Payable Maturing in 2027          
Debt Instrument [Line Items]          
Repayments of notes payable       $ 100,000,000  
Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit, current 0   0   0
Line of Credit | Financial Services          
Debt Instrument [Line Items]          
Long-term line of credit 442,800,000   442,800,000   $ 626,100,000
Line of Credit | Amendment Effective September 24, 2018 through and including December 25, 2018 | Financial Services          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 550,000,000   $ 550,000,000    
Maximum | Notes Payables          
Debt Instrument [Line Items]          
Stated interest rate 6.00%   6.00%