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Summary of Significant Accounting Policies - Organization and Principles of Consolidation (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) joint_venture property retail_shopping_center shares | Dec. 31, 2015 USD ($) shares
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Prior Period Reclassification Adjustment | $ 47,300 |
Receivable with Imputed Interest, Effective Yield (Interest Rate) | 7.00% |
Operations Commenced Date | Dec. 31, 1993 |
Current Fiscal Year End Date | --12-31 |
General Partners' Capital Account, Units Outstanding | shares | 104,497,286 | 97,213,000
Partners' Capital Account, Units | shares | 104,651,456 | 97,367,000
Number Of Joint Ventures That Grant Each Partner A Right To Dissolve The Real Estate Partnership | joint_venture | 5 |
Maximum Period Of TIme In Which Company Capitalizes Interest Costs | 12 months |
Tax Basis of Investments, Unrealized Appreciation (Depreciation), Net | $ 190,300 | $ 183,900
Parent Company [Member] |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Parent Company, Ownership Percentage of Outstanding Common Partnership Units of Operating Partnership | 99.90% | 99.80%
Restricted Cash and Cash Equivalents | $ 4,623 | $ 3,767
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 | 198 |
Unconsolidated Properties [Member] |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Number of Real Estate Properties | property | 109 |
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 | 120 |
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 | 11 |
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] |  |
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 |

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