Annual report pursuant to Section 13 and 15(d)

Debt, Net (Details)

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Debt, Net (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt    
Carrying Value $ 1,831,139,000 $ 1,823,909,000
Revolving Credit Facility    
Debt    
Carrying Value $ 177,000,000 213,000,000
Weighted average interest rate 2.70%  
Aggregate additional borrowing capacity $ 500,000,000.0  
Term Loan Facilities    
Debt    
Carrying Value 248,706,000 248,273,000
Aggregate additional borrowing capacity $ 150,000,000.0  
Interest rate 2.94%  
Unsecured note payable    
Debt    
Carrying Value $ 1,038,000 1,167,000
Interest rate 0.00%  
Unamortized discount included in carrying value $ 223,000 294,000
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Minimum    
Debt    
Variable rate, spread 0.775%  
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Maximum    
Debt    
Variable rate, spread 1.45%  
London Interbank Offered Rate (LIBOR) | Term Loan Facilities | Minimum    
Debt    
Variable rate, spread 0.85%  
London Interbank Offered Rate (LIBOR) | Term Loan Facilities | Maximum    
Debt    
Variable rate, spread 1.65%  
Mortgage and other secured debt    
Debt    
Carrying Value $ 211,485,000 170,423,000
Mortgage and other secured debt | Fixed rate mortgage debt    
Debt    
Carrying Value 143,430,000 147,141,000
Unamortized premium included in carrying value $ 217,000 281,000
Weighted average interest rate 4.16%  
Mortgage and other secured debt | Fixed rate mortgage debt | Minimum    
Debt    
Interest rate 3.82%  
Mortgage and other secured debt | Fixed rate mortgage debt | Maximum    
Debt    
Interest rate 4.62%  
Mortgage and other secured debt | Variable rate secured loans    
Debt    
Carrying Value $ 68,055,000 23,282,000
Weighted average interest rate 3.85%  
Mortgage and other secured debt | London Interbank Offered Rate (LIBOR) | Variable rate secured loans | Minimum    
Debt    
Variable rate, spread 1.45%  
Mortgage and other secured debt | London Interbank Offered Rate (LIBOR) | Variable rate secured loans | Maximum    
Debt    
Variable rate, spread 2.35%  
Mortgage and other secured debt | London Interbank Offered Rate (LIBOR) | Construction Loan Payable    
Debt    
Remaining borrowing capacity $ 64,900,000  
Senior Notes | 3.60%, $350,000 aggregate principal    
Debt    
Carrying Value 348,431,000 347,986,000
Debt instrument, face amount $ 350,000,000  
Interest rate 3.60%  
Unamortized discount included in carrying value $ 1,100,000 1,400,000
Effective interest rate on debt (as a percent) 3.70%  
Senior Notes | 5.25%, $250,000 aggregate principal    
Debt    
Carrying Value $ 247,652,000 247,136,000
Debt instrument, face amount $ 250,000,000  
Interest rate 5.25%  
Unamortized discount included in carrying value $ 2,100,000 2,600,000
Effective interest rate on debt (as a percent) 5.49%  
Senior Notes | 3.70%, $300,000 aggregate principal    
Debt    
Carrying Value $ 299,324,000 298,815,000
Debt instrument, face amount $ 300,000,000  
Interest rate 3.70%  
Unamortized discount included in carrying value $ 534,000 943,000
Effective interest rate on debt (as a percent) 3.85%  
Senior Notes | 5.00%, $300,000 aggregate principal    
Debt    
Carrying Value $ 297,503,000 297,109,000
Debt instrument, face amount $ 300,000,000  
Interest rate 5.00%  
Unamortized discount included in carrying value $ 2,100,000 2,400,000
Effective interest rate on debt (as a percent) 5.15%  
Loans Payable    
Debt    
Deferred financing costs, net $ 5,800,000 $ 7,200,000