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Debt (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Oct. 13, 2017
Debt Instrument [Line Items]      
Other notes payable $ 18,618,000 $ 20,024,000  
Debt instrument term 3 years    
Letters of credit outstanding $ 219,600,000 235,500,000  
Line of credit facility, remaining borrowing capacity 780,400,000 764,500,000  
Joint venture debt total 49,500,000    
Joint venture debt company proportionate share total 49,400,000    
Long-term line of credit $ 250,733,000 437,804,000  
Maximum      
Debt Instrument [Line Items]      
Stated interest rate 8.01%    
Unconsolidated Joint Ventures      
Debt Instrument [Line Items]      
Equity method investment, ownership percentage 50.00%    
Revolving Credit Facility Accordion Feature      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 1,500,000,000   $ 1,000,000,000.0
Revolving Credit Facility      
Debt Instrument [Line Items]      
Maximum additional issuance 500,000,000.0    
Line of credit, current 0 0  
Line of Credit | Financial Services      
Debt Instrument [Line Items]      
Long-term line of credit 250,700,000 $ 437,800,000  
Amendment Effective September 24, 2018 through and including December 25, 2018 | Line of Credit | Financial Services      
Debt Instrument [Line Items]      
Maximum borrowing capacity 400,000,000.0    
Amendment Effective December 26, 2018 through and including January 14, 2019 | Line of Credit | Financial Services      
Debt Instrument [Line Items]      
Maximum borrowing capacity 520,000,000.0    
Amendment Effective January 15, 2019 through and including March 24, 2019 | Line of Credit | Financial Services      
Debt Instrument [Line Items]      
Maximum borrowing capacity 240,000,000.0    
Amendment Effective March 25, 2019 through August 2, 2019 | Line of Credit | Financial Services      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 400,000,000.0