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Corporate Indebtedness (Senior Unsecured Notes)(Details)
6 Months Ended
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Oct. 06, 2010
USD ($)
$ / shares
Mar. 20, 2007
$ / shares
Debt disclosures by scheduled maturity date        
Accreted Balance $ 2,060,690,000 $ 2,308,478,000    
Deferred financing costs, net (101,500,000) (130,300,000)    
Senior unsecured notes        
Debt disclosures by scheduled maturity date        
Unpaid Principal Balance 1,155,008,000      
Accreted Balance 1,137,342,000 1,386,244,000    
Deferred financing costs, net (6,652,000) (7,280,000)    
Accreted Balance, Net of Deferred Financing Costs 1,130,690,000 1,378,964,000    
Senior unsecured notes | 3.00% Senior unsecured notes maturing on October 15, 2017        
Debt disclosures by scheduled maturity date        
Unpaid Principal Balance 345,000,000      
Accreted Balance $ 327,489,000 321,130,000    
Coupon Rate (as a percent) 3.00%      
Effective rate (as a percent) 3.00%      
Term (in Years) 7 years      
Premium on sale price to calculate exchange price of notes (as a percent)     30.00%  
Exchange price (in dollars per share) | $ / shares     $ 85.81  
Adjusted exchange rate for the debentures (in shares) 12.4998      
Principal amount of debentures, basis for conversion $ 1,000      
Amount of convertible debt recorded in equity     $ 78,300,000  
Debt Instrument, Unamortized Discount 17,500,000      
Senior unsecured notes | 5.00% Senior unsecured notes maturing on August 15, 2018        
Debt disclosures by scheduled maturity date        
Unpaid Principal Balance 250,000,000      
Accreted Balance $ 249,845,000 249,810,000    
Coupon Rate (as a percent) 5.00%      
Effective rate (as a percent) 5.00%      
Term (in Years) 7 years      
Senior unsecured notes | 7.75% Senior unsecured notes maturing on March 15, 2020        
Debt disclosures by scheduled maturity date        
Unpaid Principal Balance $ 250,000,000      
Accreted Balance $ 250,000,000 250,000,000    
Coupon Rate (as a percent) 7.75%      
Effective rate (as a percent) 7.75%      
Term (in Years) 10 years      
Senior unsecured notes | 4.50% Senior unsecured notes maturing on December 1, 2022        
Debt disclosures by scheduled maturity date        
Unpaid Principal Balance $ 200,000,000      
Accreted Balance $ 200,000,000 200,000,000    
Coupon Rate (as a percent) 4.50%      
Effective rate (as a percent) 4.50%      
Term (in Years) 10 years      
Senior unsecured notes | 4.27% Senior unsecured notes maturing on December 17, 2025        
Debt disclosures by scheduled maturity date        
Unpaid Principal Balance $ 100,000,000      
Accreted Balance $ 100,000,000 100,000,000    
Coupon Rate (as a percent) 4.27%      
Effective rate (as a percent) 4.27%      
Term (in Years) 10 years      
Senior unsecured notes | 3.00% Senior unsecured notes maturing on March 30, 2027        
Debt disclosures by scheduled maturity date        
Unpaid Principal Balance $ 10,008,000      
Accreted Balance $ 10,008,000 10,008,000    
Coupon Rate (as a percent) 3.00%      
Effective rate (as a percent) 3.00%      
Term (in Years) 20 years      
Premium on sale price to calculate exchange price of notes (as a percent)       25.00%
Exchange price (in dollars per share) | $ / shares       $ 173.30
Adjusted exchange rate for the debentures (in shares) 5.7985      
Principal amount of debentures, basis for conversion $ 1,000      
Senior unsecured notes | Senior Unsecured Notes repaid in March 2016        
Debt disclosures by scheduled maturity date        
Unpaid Principal Balance 0      
Accreted Balance $ 0 $ 255,296,000