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- Consolidated Indebtedness by Type of Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Jun. 29, 2015
Jun. 28, 2015
Participating Mortgage Loans [Line Items]        
Long-term debt $ 1,734,059,000 $ 1,554,263,000    
Revolving Credit Facility        
Participating Mortgage Loans [Line Items]        
Remaining borrowing capacity $ 339,500,000      
Maximum borrowing capacity   $ 500,000,000    
Basis spread on variable rate 1.40% 1.40%    
Interest rate, effective percentage 1.83% 1.57%    
Long-term debt $ 20,000,000 $ 160,000,000    
Senior Unsecured Notes        
Participating Mortgage Loans [Line Items]        
Long-term debt $ 250,000,000      
Senior Unsecured Notes | Fixed Rate Debt | Minimum        
Participating Mortgage Loans [Line Items]        
Interest rate during period 4.23%      
Senior Unsecured Notes | Fixed Rate Debt | Maximum        
Participating Mortgage Loans [Line Items]        
Interest rate during period 4.57%      
Unsecured Debt        
Participating Mortgage Loans [Line Items]        
Long-term debt $ 500,000,000 $ 230,000,000 $ 400,000,000 $ 230,000,000
Unsecured Debt | Unsecured Term Loans, Maturing July 2019        
Participating Mortgage Loans [Line Items]        
Basis spread on variable rate 1.35% 1.35%    
Interest rate, effective percentage 1.78% 1.52%    
Face amount $ 400,000,000 $ 400,000,000    
Unsecured Debt | Unsecured Term Loans, Maturing October 2022        
Participating Mortgage Loans [Line Items]        
Basis spread on variable rate 1.60%      
Interest rate, effective percentage 2.03%      
Face amount $ 100,000,000 100,000,000    
Construction Loans | Variable Rate Debt        
Participating Mortgage Loans [Line Items]        
Long-term debt $ 132,776,000 $ 119,347,000    
Construction Loans | Variable Rate Debt | Minimum        
Participating Mortgage Loans [Line Items]        
Basis spread on variable rate 1.75% 1.75%    
Interest rate, effective percentage 2.18% 1.92%    
Construction Loans | Variable Rate Debt | Maximum        
Participating Mortgage Loans [Line Items]        
Basis spread on variable rate 2.10% 2.10%    
Interest rate, effective percentage 2.53% 2.27%    
Mortgages | Variable Rate Debt        
Participating Mortgage Loans [Line Items]        
Long-term debt $ 58,268,000 $ 205,798,000    
Mortgages | Variable Rate Debt | Minimum        
Participating Mortgage Loans [Line Items]        
Interest rate during period 2.13% 1.92%    
Basis spread on variable rate 1.70% 1.75%    
Mortgages | Variable Rate Debt | Maximum        
Participating Mortgage Loans [Line Items]        
Interest rate during period 2.68% 2.92%    
Basis spread on variable rate 2.25% 2.75%    
Mortgages | Fixed Rate Debt        
Participating Mortgage Loans [Line Items]        
Long-term debt $ 756,494,000 $ 810,959,000    
Mortgages | Fixed Rate Debt | Minimum        
Participating Mortgage Loans [Line Items]        
Interest rate during period 3.78% 3.81%    
Mortgages | Fixed Rate Debt | Maximum        
Participating Mortgage Loans [Line Items]        
Interest rate during period 6.78% 6.78%    
Net Premiums On Acquired Debt        
Participating Mortgage Loans [Line Items]        
Long-term debt $ 16,521,000 $ 28,159,000