Quarterly report pursuant to Section 13 or 15(d)

Debt, Net (Details)

v3.3.0.814
Debt, Net (Details)
3 Months Ended 9 Months Ended
Jun. 29, 2015
USD ($)
May. 06, 2015
USD ($)
extensions
Apr. 20, 2015
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Aug. 28, 2015
USD ($)
May. 05, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt                    
Carrying Value       $ 2,121,240,000   $ 2,121,240,000       $ 1,920,057,000
Interest costs capitalized       1,500,000 $ 1,300,000 5,600,000 $ 4,300,000      
Line of Credit | Revolving Credit Facility                    
Debt                    
Number of extensions | extensions   2                
Term of extension option   6 months                
Line of Credit | Revolving Credit Facility | Minimum                    
Debt                    
Commitment fee (as a percent)   0.125%                
Line of Credit | Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)                    
Debt                    
Variable rate, spread (as a percent)   0.875%                
Line of Credit | Revolving Credit Facility | Maximum                    
Debt                    
Commitment fee (as a percent)   0.30%                
Line of Credit | Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)                    
Debt                    
Variable rate, spread (as a percent)   1.60%                
Line of Credit | Term Loan Facilities                    
Debt                    
Maximum availability   $ 300,000,000             $ 250,000,000  
Increase to maximum borrowing capacity   200,000,000                
Aggregate maximum borrowing capacity   500,000,000                
Proceeds from issuance of debt   $ 50,000,000                
Line of Credit | Term Loan Facilities | Minimum | London Interbank Offered Rate (LIBOR)                    
Debt                    
Variable rate, spread (as a percent)   0.90%                
Line of Credit | Term Loan Facilities | Maximum | London Interbank Offered Rate (LIBOR)                    
Debt                    
Variable rate, spread (as a percent)   1.85%                
Mortgage and Other Secured Loans:                    
Debt                    
Carrying Value       324,466,000   324,466,000       424,016,000
Fixed rate mortgage loans                    
Debt                    
Carrying Value       288,217,000   $ 288,217,000       387,139,000
Stated interest rates, low end of range (as a percent)           3.96%        
Stated interest rates, high end of range (as a percent)           7.87%        
Unamortized premium included in carrying value       $ 24,000   $ 24,000       42,000
Debt settled through the surrender of real estate assets               $ 150,000,000    
Weighted-average interest rate excluding incremental rate on default rate       6.07%   6.07%        
Variable rate secured loans                    
Debt                    
Carrying Value       $ 36,249,000   $ 36,249,000       36,877,000
Description of variable rate basis           LIBOR        
Stated interest rate (as a percent)       2.45%   2.45%        
Variable rate secured loans | London Interbank Offered Rate (LIBOR)                    
Debt                    
Variable rate, spread (as a percent)           2.25%        
Variable rate secured loans | Revolving Credit Facility                    
Debt                    
Weighted average interest rate (as a percent)       1.48%   1.48%        
Revolving Credit Facility                    
Debt                    
Carrying Value       $ 87,000,000   $ 87,000,000       83,000,000
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%        
Revolving Credit Facility | Revolving Credit Facility                    
Debt                    
Maximum availability       800,000,000   $ 800,000,000        
Term Loan Facilities                    
Debt                    
Carrying Value       $ 520,000,000   $ 520,000,000       520,000,000
Description of variable rate basis           LIBOR        
Weighted average interest rate (as a percent)       1.78%   1.78%        
Additional borrowing capacity available provided there is no default under the agreement       $ 380,000,000   $ 380,000,000        
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)           2.60%        
3.60% Senior Notes | Unsecured senior notes                    
Debt                    
Carrying Value       $ 347,691,000   $ 347,691,000       347,496,000
Stated interest rate (as a percent)       3.60%   3.60%        
Debt instrument, face amount       $ 350,000,000   $ 350,000,000        
Unamortized discount included in carrying value       $ 2,300,000   $ 2,300,000       2,500,000
Interest rate on debt (as a percent)       3.70%   3.70%        
5.250% Senior Notes | Unsecured senior notes                    
Debt                    
Carrying Value       $ 246,074,000   $ 246,074,000       245,797,000
Stated interest rate (as a percent)       5.25%   5.25%        
Debt instrument, face amount       $ 250,000,000   $ 250,000,000        
Unamortized discount included in carrying value       $ 3,900,000   $ 3,900,000       4,200,000
Interest rate on debt (as a percent)       5.49%   5.49%        
3.70% Senior Notes | Unsecured senior notes                    
Debt                    
Carrying Value       $ 297,830,000   $ 297,830,000       297,569,000
Stated interest rate (as a percent)       3.70%   3.70%        
Debt instrument, face amount       $ 300,000,000   $ 300,000,000        
Unamortized discount included in carrying value       $ 2,200,000   $ 2,200,000       2,400,000
Interest rate on debt (as a percent)       3.85%   3.85%        
5.000% Senior Notes | Unsecured senior notes                    
Debt                    
Carrying Value       $ 296,646,000   $ 296,646,000       0
Stated interest rate (as a percent) 5.00%     5.00%   5.00%        
Debt instrument, face amount $ 300,000,000                  
Unamortized discount included in carrying value       $ 3,400,000   $ 3,400,000        
Interest rate on debt (as a percent)       5.15%   5.15%        
Debt issuance as a percentage of principal amount 99.51%                  
Proceeds from debt, net $ 296,600,000                  
Redemption price ( as a percent) 100.00%                  
5.000% Senior Notes | Unsecured senior notes | Adjusted Treasury                    
Debt                    
Basis points used in determining redemption price prior to maturity 0.45%                  
Unsecured notes payable                    
Debt                    
Carrying Value       $ 1,533,000   $ 1,533,000       1,607,000
Stated interest rate (as a percent)       0.00%   0.00%        
Unamortized discount included in carrying value       $ 578,000   $ 578,000       654,000
4.25% Exchangeable Senior Notes                    
Debt                    
Carrying Value       $ 0   $ 0       $ 572,000
Percentage of principal amount redeemed     100.00%