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Summary of Significant Accounting Policies - Organization and Principles of Consolidation (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
property
retail_shopping_center
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Concentration Risk, Percentage 18.00%    
Operations Commenced Date Dec. 31, 1993    
Document Fiscal Year Focus 2018    
Parent Company, Ownership Percentage of Outstanding Common Partnership Units of Operating Partnership 99.80% 99.80%  
General Partners' Capital Account, Units Outstanding | shares 167,904,593 171,365,000  
Partners' Capital Account, Units | shares 168,254,495 171,715,000  
Maximum Period Of TIme In Which Company Capitalizes Interest Costs 12 months    
Tax Basis of Investments, Unrealized Appreciation (Depreciation), Net   $ 2,800,000  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount $ 0 9,737 $ 0
Provision for Doubtful Accounts (10,100) (8,040)  
Straight Line Rent 105,677 93,284  
Accrued CAM, Insurance and Tax Reimbursements 25,305 14,825  
Parent Company [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Restricted Cash and Cash Equivalents $ 2,658 4,011  
Conversion of Stock, Conversion Ratio 0.45    
Stock Issued During Period, Shares, Acquisitions | shares 65,500,000    
Accounts and Notes Receivable, Net $ 172,359 170,985  
Partnership Interest [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
General Partners' Capital Account, Units Outstanding | shares 167,904,000    
Restricted Cash and Cash Equivalents $ 2,658 4,011  
Accounts and Notes Receivable, Net $ 172,359 170,985  
Wholly Owned Properties [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of Real Estate Properties | property 305    
Unconsolidated Properties [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of Real Estate Properties | property 120    
Partially Owned Properties [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of Real Estate Properties | retail_shopping_center 133    
Consolidated Properties [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of Real Estate Properties | retail_shopping_center 13    
Minimum [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Equity Method Investment, Accretion Period 10 years    
Maximum [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Concentration Risk, Percentage 5.00%    
Equity Method Investment, Accretion Period 40 years    
Building and Improvements [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Property, Plant and Equipment, Useful Life 40 years    
Tenant Improvements [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Property, Plant and Equipment, Useful Life 10 years    
Furniture and Fixtures [Member] | Minimum [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Furniture and Fixtures [Member] | Maximum [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Property, Plant and Equipment, Useful Life 7 years    
Billed Tenant Receivables [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Accounts and Notes Receivable, Net $ 25,590 25,329  
Other Receivable [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Accounts and Notes Receivable, Net 30,953 34,472  
Notes Receivable [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Accounts and Notes Receivable, Net 0 15,803  
straight line rent [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Provision for Doubtful Accounts $ (5,066) $ (4,688)