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Corporate Indebtedness - Senior Unsecured Notes (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Debt disclosures by scheduled maturity date      
Unpaid Principal Balance   $ 5,551,883,000  
Accreted Balance   1,496,847,000 $ 1,495,214,000
Deferred financing costs, net   (28,630,000) (26,919,000)
Senior Unsecured Bonds | 4.50% Senior Unsecured Bonds Due December 2022      
Debt disclosures by scheduled maturity date      
Coupon Rate (as a percent) 4.50%    
Face amount of loan $ 100,000,000.0    
Redemption price, percentage 105.334%    
Senior unsecured notes      
Debt disclosures by scheduled maturity date      
Unpaid Principal Balance   1,500,000,000  
Accreted Balance   1,502,837,000 1,503,759,000
Deferred financing costs, net   (5,990,000) (8,545,000)
Senior notes, net of deferred finance costs   1,496,847,000 1,495,214,000
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%  
Initial Term (in Years)   10 years  
Senior unsecured notes | 0.98% Senior unsecured notes maturing August 2021      
Debt disclosures by scheduled maturity date      
Unpaid Principal Balance   $ 350,000,000  
Accreted Balance   $ 350,000,000 350,000,000
Coupon Rate (as a percent)   0.98%  
Initial Term (in Years)   3 years  
Redemption price, percentage   100.00%  
Senior unsecured notes | 3.25% Senior unsecured notes maturing October 2022      
Debt disclosures by scheduled maturity date      
Unpaid Principal Balance   $ 500,000,000  
Accreted Balance   $ 499,695,000 499,591,000
Coupon Rate (as a percent)   3.25%  
Initial Term (in Years)   5 years  
Senior unsecured notes | 4.50% Senior unsecured notes maturing on December 1, 2022      
Debt disclosures by scheduled maturity date      
Unpaid Principal Balance   $ 300,000,000  
Accreted Balance   $ 303,142,000 304,168,000
Coupon Rate (as a percent)   4.50%  
Initial 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%  
Initial Term (in Years)   10 years