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Debt (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Oct. 13, 2017
Debt Instrument [Line Items]      
Other notes payable $ 37,708,000 $ 41,313,000  
Debt instrument term 3 years    
Letters of credit outstanding $ 232,900,000 239,400,000  
Line of credit facility, remaining borrowing capacity 767,100,000 760,600,000  
Joint venture debt total 35,200,000    
Joint venture debt company proportionate share total 34,400,000    
Long-term line of credit $ 222,139,000 348,412,000  
Maximum      
Debt Instrument [Line Items]      
Stated interest rate 5.17%    
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 222,100,000 $ 348,400,000  
Amendment Effective September 24, 2018 through and including December 25, 2018 | Line of Credit | Financial Services      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 350,000,000.0