Annual report pursuant to Section 13 and 15(d)

Debt, Net (Details 4)

v3.8.0.1
Debt, Net (Details 4)
 12 Months Ended
May 01, 2017
USD ($)
Dec. 28, 2016
USD ($)
Dec. 17, 2015
USD ($)
Aug. 28, 2015
USD ($)
Jun. 29, 2015
USD ($)
May 06, 2015
USD ($)
Feb. 14, 2012
USD ($)
Dec. 31, 2017
USD ($)
extension
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]                    
(Loss) gain on early extinguishment of debt               $ 513,000 $ 1,110,000 $ (85,275,000)
Term Credit Facility Effective February 2012 [Member]                    
Debt Instrument [Line Items]                    
Initial amount borrowed             $ 250,000,000      
Term Loan Facilities Maturing 2020 [Member]                    
Debt Instrument [Line Items]                    
Repayments of term loan $ 200,000,000                  
Term Credit Facility Effective August 2012 [Member]                    
Debt Instrument [Line Items]                    
Repayments of debt                 120,000,000  
Term Credit Facility Effective September 2011 [Member]                    
Debt Instrument [Line Items]                    
Repayments of debt                   $ 150,000,000
Fixed rate mortgage loans [Member]                    
Debt Instrument [Line Items]                    
Debt settled through the surrender of real estate assets       $ 150,000,000            
Minimum [Member] | Term Credit Facility Effective February 2012 [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Variable rate, spread (as a percent)           0.90%        
Maximum [Member] | Term Credit Facility Effective February 2012 [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Variable rate, spread (as a percent)           1.85%        
Revolving Credit Facility [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum availability               800,000,000    
Expansion right, maximum borrowing capacity               $ 1,300,000,000    
Line of credit facility, extension fee percentage               0.075%    
Remaining borrowing capacity               $ 674,000,000    
Weighted average borrowings               $ 97,800,000 $ 90,300,000  
Weighted average interest rate (as a percent)               2.44% 1.64%  
Line of Credit [Member] | Term Credit Facility Effective February 2012 [Member]                    
Debt Instrument [Line Items]                    
Maximum availability           $ 300,000,000        
Increase to maximum borrowing capacity           $ 200,000,000        
Line of Credit [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Number of extensions | extension               2    
Extension option period (in years)               6 months    
Line of Credit [Member] | Revolving Credit Facility [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Commitment fee percentage           0.125%        
Line of Credit [Member] | Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Variable rate, spread (as a percent)           0.875%        
Line of Credit [Member] | Revolving Credit Facility [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Commitment fee percentage           0.30%        
Line of Credit [Member] | Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Variable rate, spread (as a percent)           1.60%        
Unsecured Debt [Member] | Term Credit Facility Effective December 2015 [Member]                    
Debt Instrument [Line Items]                    
Maximum availability     $ 250,000,000              
Remaining borrowing capacity               $ 150,000,000    
Initial amount borrowed     $ 100,000,000              
Unsecured Debt [Member] | Term Credit Facility Effective December 2016 [Member]                    
Debt Instrument [Line Items]                    
Initial amount borrowed   $ 150,000,000                
Unsecured Debt [Member] | Minimum [Member] | Term Credit Facility Effective December 2015 [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Variable rate, spread (as a percent)     0.90%              
Unsecured Debt [Member] | Maximum [Member] | Term Credit Facility Effective December 2015 [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Variable rate, spread (as a percent)     1.75%              
Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Redemption price (percent)               100.00%    
Senior Notes [Member] | 5.0% Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Loan amount         $ 300,000,000          
Stated interest rate (as a percent)         5.00%     5.00%    
Debt issuance as a percentage of principal amount         99.51%          
Unamortized discount included in carrying value               $ 2,700,000 $ 3,000,000  
Interest rate on debt (as a percent)               5.15%    
Proceeds from debt, net         $ 296,600,000          
Senior Notes [Member] | 5.0% Senior Notes [Member] | Adjusted Treasury [Member]                    
Debt Instrument [Line Items]                    
Basis points used in determining redemption price prior to maturity               0.45%    
Senior Notes [Member] | 3.70% Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent)               3.70%    
Unamortized discount included in carrying value               $ 1,300,000 1,700,000  
Interest rate on debt (as a percent)               3.85%    
Senior Notes [Member] | 3.70% Senior Notes [Member] | Adjusted Treasury [Member]                    
Debt Instrument [Line Items]                    
Basis points used in determining redemption price prior to maturity               0.25%    
Senior Notes [Member] | 3.60% Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent)               3.60%    
Unamortized discount included in carrying value               $ 1,700,000 2,000,000  
Interest rate on debt (as a percent)               3.70%    
Senior Notes [Member] | 3.60% Senior Notes [Member] | Adjusted Treasury [Member]                    
Debt Instrument [Line Items]                    
Basis points used in determining redemption price prior to maturity               0.30%    
Senior Notes [Member] | 5.250% Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent)               5.25%    
Unamortized discount included in carrying value               $ 3,000,000 $ 3,400,000  
Interest rate on debt (as a percent)               5.49%    
Senior Notes [Member] | 5.250% Senior Notes [Member] | Adjusted Treasury [Member]                    
Debt Instrument [Line Items]                    
Basis points used in determining redemption price prior to maturity               0.40%    
Operating properties, net [Member] | 15000 and 15010 Conference Center Drive [Member]                    
Debt Instrument [Line Items]                    
(Loss) gain on early extinguishment of debt       (84,800,000)            
Debt settled through the surrender of real estate assets       $ 150,000,000