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Summary Of Significant Accounting Policies (Narrative) (Details)
ft² in Millions
12 Months Ended
Jan. 01, 2012
plans
Dec. 31, 2016
ft²
segment
foreign
Dec. 31, 2011
Significant Accounting Policies [Line Items]      
Square footage of operating properties (in square feet) | ft²   44.7  
Real estate asset, estimated useful life   40 years  
Single purpose entity, ownership percentage   100.00%  
Vesting period (years) for share options and awards   3 years  
Number of foreign operations | foreign   0  
Number of reportable segments | segment   1  
Supplemental Retirement Plan, Defined Contribution Plan [Member]      
Significant Accounting Policies [Line Items]      
Number of retirement plans | plans 2    
Supplemental Retirement Plan, Defined Contribution Plan [Member] | Minimum [Member]      
Significant Accounting Policies [Line Items]      
Defined contribution plan, vesting period 5 years    
Supplemental Retirement Plan, Defined Contribution Plan [Member] | Maximum [Member]      
Significant Accounting Policies [Line Items]      
Defined contribution plan, vesting period 10 years    
Supplemental Retirement Plan, Defined Contribution Plan, New Balance Annual Additions [Member]      
Significant Accounting Policies [Line Items]      
Defined contribution plan, interest credit percentage 4.50%    
Supplemental Retirement Plan, Defined Contribution Plan, New Balance Annual Additions [Member] | Minimum [Member]      
Significant Accounting Policies [Line Items]      
Defined contribution plan, service credit percentage 3.00%    
Supplemental Retirement Plan, Defined Contribution Plan, New Balance Annual Additions [Member] | Maximum [Member]      
Significant Accounting Policies [Line Items]      
Defined contribution plan, service credit percentage 5.00%    
Supplemental Retirement Plan, Defined Contribution Plan, Old Balance Annual Addtions [Member]      
Significant Accounting Policies [Line Items]      
Defined contribution plan, interest credit percentage 7.50%    
Savings and Investment Plan, Defined Contribution Plan [Member]      
Significant Accounting Policies [Line Items]      
Defined contribution plan, vesting period   5 years  
Defined contribution plan, minimum annual contribution per employee, percent   1.00%  
Defined contribution plan, employer matched rate of employee contributions, percentage   50.00%  
Defined contribution plan, employer matching contribution, percent   6.00%  
Retirement Plan [Member]      
Significant Accounting Policies [Line Items]      
Defined benefit plan, interest credit rate   4.50%  
Defined benefit plan, vesting period (years)   3 years  
Retirement Plan [Member] | Minimum [Member]      
Significant Accounting Policies [Line Items]      
Defined benefit plan, service credit percentage   3.00%  
Retirement Plan [Member] | Maximum [Member]      
Significant Accounting Policies [Line Items]      
Defined benefit plan, service credit percentage   5.00%  
Service Based Awards [Member]      
Significant Accounting Policies [Line Items]      
Vesting period (years) for share options and awards   3 years  
Share Awards [Member] | Officer [Member]      
Significant Accounting Policies [Line Items]      
Vesting period (years) for share options and awards     5 years
Market Based Awards [Member]      
Significant Accounting Policies [Line Items]      
Vesting period (years) for share options and awards   3 years  
Market-Based Awards Relative To FTSE NAREIT U.S. Shopping Center Index [Member]      
Significant Accounting Policies [Line Items]      
Vesting period (years) for share options and awards   3 years  
Percentage allocation of market based awards   50.00%  
Market-Based Awards Relative To Three-Year Absolute TSR [Member]      
Significant Accounting Policies [Line Items]      
Vesting period (years) for share options and awards   3 years  
Percentage allocation of market based awards   50.00%  
Market based awards, hurdle comparison   8.00%  
Share Options [Member]      
Significant Accounting Policies [Line Items]      
Maximum term of option award (years)   10 years  
Building [Member] | Minimum [Member]      
Significant Accounting Policies [Line Items]      
Real estate asset, estimated useful life   18 years  
Building [Member] | Maximum [Member]      
Significant Accounting Policies [Line Items]      
Real estate asset, estimated useful life   40 years  
Parking Lot Surfacing And Equipment [Member] | Minimum [Member]      
Significant Accounting Policies [Line Items]      
Real estate asset, estimated useful life   10 years  
Parking Lot Surfacing And Equipment [Member] | Maximum [Member]      
Significant Accounting Policies [Line Items]      
Real estate asset, estimated useful life   20 years  
90-Day London Interbank Offered Rate (LIBOR) [Member] | Supplemental Retirement Plan, Defined Contribution Plan, Old Balance Annual Addtions [Member]      
Significant Accounting Policies [Line Items]      
Defined contribution plan, basis spread on variable rate   0.005  
Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]      
Significant Accounting Policies [Line Items]      
Concentrations of risk   3.10%  
Houston Texas Geographic Concentration [Member] | Sales Revenue, Services, Net [Member]      
Significant Accounting Policies [Line Items]      
Concentrations of risk   20.50%  
Other Parts of Texas Geographic Concentration [Member] | Sales Revenue, Services, Net [Member]      
Significant Accounting Policies [Line Items]      
Concentrations of risk   9.50%