Quarterly report pursuant to Section 13 or 15(d)

Debt, Net (Details)

v3.7.0.1
Debt, Net (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Debt      
Carrying Value $ 1,903,657,000   $ 1,904,001,000
Deferred financing costs, net 2,444,000   3,128,000
Interest costs capitalized 1,500,000 $ 1,800,000  
Secured Debt      
Debt      
Carrying Value 166,659,000   167,591,000
Loans payable      
Debt      
Deferred financing costs, net 5,700,000   6,100,000
Fixed rate debt | Secured Debt      
Debt      
Carrying Value 153,294,000   154,143,000
Unamortized premium included in carrying value $ 403,000   422,000
Weighted average interest rate (as a percent) 4.19%    
Fixed rate debt | Secured Debt | Minimum      
Debt      
Stated interest rate (as a percent) 3.82%    
Fixed rate debt | Secured Debt | Maximum      
Debt      
Stated interest rate (as a percent) 7.87%    
Variable-rate debt      
Debt      
Description of variable rate basis LIBOR    
Variable-rate debt | Secured Debt      
Debt      
Carrying Value $ 13,365,000   13,448,000
Stated interest rate (as a percent) 2.63%    
Variable-rate debt | Secured Debt | London Interbank Offered Rate (LIBOR)      
Debt      
Variable rate, spread (as a percent) 1.85%    
Revolving Credit Facility      
Debt      
Carrying Value $ 0   0
Description of variable rate basis LIBOR    
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)      
Debt      
Variable rate, spread (as a percent) 0.875%    
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)      
Debt      
Variable rate, spread (as a percent) 1.60%    
Term Loan Facilities      
Debt      
Carrying Value $ 547,682,000   547,494,000
Description of variable rate basis LIBOR    
Weighted average interest rate (as a percent) 2.37%    
Aggregate additional borrowing capacity available $ 350,000,000    
Term Loan Facilities | Minimum | London Interbank Offered Rate (LIBOR)      
Debt      
Variable rate, spread (as a percent) 0.90%    
Term Loan Facilities | Maximum | London Interbank Offered Rate (LIBOR)      
Debt      
Variable rate, spread (as a percent) 2.40%    
3.60% Senior Notes | Unsecured senior notes      
Debt      
Carrying Value $ 347,233,000   347,128,000
Debt instrument, face amount $ 350,000,000    
Stated interest rate (as a percent) 3.60%    
Unamortized discount included in carrying value $ 1,900,000   2,000,000
Interest rate on debt (as a percent) 3.70%    
5.250% Senior Notes | Unsecured senior notes      
Debt      
Carrying Value $ 246,291,000   246,176,000
Debt instrument, face amount $ 250,000,000    
Stated interest rate (as a percent) 5.25%    
Unamortized discount included in carrying value $ 3,300,000   3,400,000
Interest rate on debt (as a percent) 5.49%    
3.70% Senior Notes | Unsecured senior notes      
Debt      
Carrying Value $ 297,961,000   297,843,000
Debt instrument, face amount $ 300,000,000    
Stated interest rate (as a percent) 3.70%    
Unamortized discount included in carrying value $ 1,600,000   1,700,000
Interest rate on debt (as a percent) 3.85%    
5.000% Senior Notes | Unsecured senior notes      
Debt      
Carrying Value $ 296,457,000   296,368,000
Debt instrument, face amount $ 300,000,000    
Stated interest rate (as a percent) 5.00%    
Unamortized discount included in carrying value $ 2,900,000   3,000,000
Interest rate on debt (as a percent) 5.15%    
Unsecured notes payable      
Debt      
Carrying Value $ 1,374,000   1,401,000
Stated interest rate (as a percent) 0.00%    
Unamortized discount included in carrying value $ 438,000   $ 460,000