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Debt (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jul. 15, 2019
Dec. 31, 2018
Debt Instrument [Line Items]            
Other notes payable $ 32,658,000   $ 32,658,000     $ 41,313,000
Debt instrument term     3 years      
Line of Credit Facility, Current Borrowing Capacity 1,000,000,000.0   $ 1,000,000,000.0      
Repurchased face amount   $ 274,000,000.0   $ 274,000,000.0    
Gain (loss) on repurchase of debt     (4,800,000)      
Loss on debt retirement (see Note 4) 0 $ 0 (4,843,000) $ (76,000)    
Maximum borrowing capacity 1,500,000,000   1,500,000,000      
Letters of credit outstanding 267,300,000   267,300,000     239,400,000
Line of credit facility, remaining borrowing capacity 732,700,000   732,700,000     760,600,000
Joint venture debt total 18,200,000   18,200,000      
Joint venture debt company proportionate share total 17,500,000   17,500,000      
Long-term line of credit $ 249,360,000   $ 249,360,000     348,412,000
Unconsolidated Joint Ventures            
Debt Instrument [Line Items]            
Equity method investment, ownership percentage 50.00%   50.00%      
Revolving Credit Facility Accordion Feature            
Debt Instrument [Line Items]            
Maximum additional issuance     $ 500,000,000.0      
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 249,400,000   249,400,000     $ 348,400,000
Line of Credit | Amendment Effective September 24, 2018 through and including December 25, 2018 | Financial Services            
Debt Instrument [Line Items]            
Maximum borrowing capacity 260,000,000.0   260,000,000.0   $ 375,000,000.0  
Minimum | Line of Credit | Financial Services            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 220,000,000.0   $ 220,000,000.0      
Maximum            
Debt Instrument [Line Items]            
Stated interest rate 8.00%   8.00%      
Maximum | Line of Credit | Financial Services            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 270,000,000.0   $ 270,000,000.0