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Corporate Indebtedness (Senior Unsecured Notes)(Details)
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Oct. 06, 2010
USD ($)
$ / shares
Debt disclosures by scheduled maturity date      
Deferred financing costs, net $ (82,300,000) $ (130,300,000)  
Senior unsecured notes      
Debt disclosures by scheduled maturity date      
Unpaid Principal Balance 1,145,000,000    
Accreted Balance 1,133,957,000 1,386,244,000  
Deferred financing costs, net (5,642,000) (7,280,000)  
Senior Notes, Net of Deferred Finance Costs 1,128,315,000 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 $ 334,077,000 321,130,000  
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) 12.6478    
Principal amount of debentures, basis for conversion $ 1,000    
Amount of convertible debt recorded in equity     $ 78,300,000
Debt Instrument, Unamortized Discount 10,900,000    
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 $ 249,880,000 249,810,000  
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 $ 0    
Accreted Balance 0 10,008,000  
Senior unsecured notes | 6.00% Senior unsecured notes maturing on March 31, 2016      
Debt disclosures by scheduled maturity date      
Unpaid Principal Balance 0    
Accreted Balance $ 0 $ 255,296,000