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Corporate Indebtedness - Senior Unsecured Notes (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2017
Dec. 31, 2020
Apr. 30, 2020
Dec. 31, 2019
Debt disclosures by scheduled maturity date        
Accreted Balance   $ 1,248,219,000   $ 1,496,847,000
Deferred financing costs, net   (21,388,000)   (28,630,000)
Senior unsecured notes maturing August 2021 | Interest Rate Swap [Member]        
Debt disclosures by scheduled maturity date        
Notional amount     $ 350,000,000.0  
Derivative, fixed interest rate     0.54375%  
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   1,250,000,000    
Accreted Balance   1,251,889,000   1,502,837,000
Deferred financing costs, net   (3,670,000)   (5,990,000)
Senior notes, net of deferred finance costs   1,248,219,000   1,496,847,000
Senior unsecured notes | 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)   1.52%    
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   $ 499,803,000   499,695,000
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   $ 302,086,000   303,142,000
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    
Senior unsecured notes | Senior Unsecured Note Due March 16, 2020        
Debt disclosures by scheduled maturity date        
Unpaid Principal Balance   $ 0    
Accreted Balance   $ 0   $ 250,000,000