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Debt (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Apr. 18, 2018
Dec. 31, 2017
Oct. 13, 2017
Debt Instrument [Line Items]        
Notes payable $ 2,986,895,000   $ 2,986,943,000  
Limitedrecoursenote 81,200,000      
Letters of credit outstanding 226,300,000   235,500,000  
Other Notes Payable 100,823,000   20,024,000  
Line of credit facility, remaining borrowing capacity 773,700,000   764,500,000  
Notes Payable $ 3,087,718,000   3,006,967,000  
Debt instrument term 3 years      
Joint venture debt total $ 57,800,000      
Joint venture debt company proportionate share total 57,000,000      
Long-term line of credit $ 246,952,000   437,804,000  
Maximum        
Debt Instrument [Line Items]        
Stated interest rate 7.53%      
Unconsolidated Joint Ventures        
Debt Instrument [Line Items]        
Equity method investment, ownership percentage 50.00%      
Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum additional issuance $ 375,000,000      
Line of credit, current 0   0  
Revolving Credit Facility Accordion Feature        
Debt Instrument [Line Items]        
Maximum borrowing capacity 1,250,000,000.00     $ 1,000,000,000.0
Line of Credit | Financial Services        
Debt Instrument [Line Items]        
Maximum borrowing capacity 250,000,000      
Long-term line of credit 247,000,000   437,800,000  
Line of Credit | Maximum | Financial Services        
Debt Instrument [Line Items]        
Maximum borrowing capacity 400,000,000      
Senior Notes | 4.250% unsecured senior notes due March 2021        
Debt Instrument [Line Items]        
Face amount $ 700,000,000   $ 700,000,000  
Stated interest rate 4.25%   4.25%  
Senior Notes | 5.500% unsecured senior notes due March 2026        
Debt Instrument [Line Items]        
Face amount $ 700,000,000   $ 700,000,000  
Stated interest rate 5.50%   5.50%  
Senior Notes | 5.000% unsecured senior notes due January 2027        
Debt Instrument [Line Items]        
Face amount $ 600,000,000   $ 600,000,000  
Stated interest rate 5.00%   5.00%  
Subsequent Event | Line of Credit | Financial Services        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 350,000,000.0