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Debt - (Details) - USD ($)
12 Months Ended
Aug. 07, 2018
Dec. 01, 2017
Mar. 07, 2017
Dec. 31, 2018
Dec. 31, 2017
Aug. 11, 2016
Jul. 07, 2016
Jan. 07, 2016
Debt                
Debt, gross       $ 1,548,662,000 $ 1,491,680,000      
Unsecured Term Loan Due June 2022                
Debt                
Current borrowing capacity $ 1,100,000,000              
Maximum borrowing capacity as a percentage of maximum principal amount 10.00%              
Increase in maximum borrowing capacity $ 500,000,000              
Maximum borrowing capacity 1,600,000,000              
Unused fee (as a percent)       0.25%        
Series A                
Debt                
Effective fixed interest rate           4.09%   4.03%
Series B                
Debt                
Effective fixed interest rate           4.18%   4.43%
Series C                
Debt                
Effective fixed interest rate               4.57%
Series D                
Debt                
Effective fixed interest rate               4.74%
LIBOR | Unsecured Term Loan Due June 2022                
Debt                
Reference rate (as a percent)       1.10%        
Unsecured Debt | LIBOR | Unsecured Term Loan Due June 2022                
Debt                
Reference rate (as a percent)       1.25% 1.80%      
Senior Notes                
Debt                
Fixed interest rate   3.95% 4.30%          
Total mortgage debt   $ 350,000,000.0 $ 400,000,000.0     $ 75,000,000.0   $ 150,000,000.0
Proceeds from issuance of debt   $ 347,000,000.0 $ 396,100,000          
Debt instrument, redemption price, percentage   99.78% 99.68%          
Senior Notes | Series A                
Debt                
Total mortgage debt           25,000,000.0   15,000,000.0
Senior Notes | Series B                
Debt                
Total mortgage debt           25,000,000.0   45,000,000.0
Senior Notes | Series C                
Debt                
Total mortgage debt           $ 25,000,000.0   45,000,000.0
Effective fixed interest rate           4.24%    
Senior Notes | Series D                
Debt                
Total mortgage debt               $ 45,000,000.0
Term Loan                
Debt                
Amount outstanding       $ 250,000,000.0     $ 250,000,000.0  
Term Loan | Unsecured Term Loan Due June 2022                
Debt                
Current borrowing capacity $ 250,000,000              
Debt instrument, term 7 years              
Letter of Credit                
Debt                
Amount outstanding       17,000,000.0        
Credit Agreement                
Debt                
Current borrowing capacity       618,000,000.0        
Term of extension option 1 year              
Amount outstanding       $ 215,000,000.0        
Maximum | Credit Agreement | Unsecured Term Loan Due June 2022                
Debt                
Current borrowing capacity $ 850,000,000              
Operating Partnership | Credit Agreement                
Debt                
Debt instrument, interest rate, effective percentage       3.81% 3.93%      
Operating Partnership | Credit Agreement | LIBOR                
Debt                
Reference rate (as a percent)       2.46% 1.49%