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Investments in Real Estate Partnerships - Schedule of Acquisitions by Real Estate Partnerships (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) property | Dec. 31, 2015 USD ($) property | Dec. 31, 2014 USD ($) property
Business Acquisition [Line Items] |  |  |
Proceeds from sale of real estate investments | $ 137,479,000 | $ 108,822,000 | $ 118,787,000
Gain on sale of real estate | 70,907,000 | 2,766,000 | 28,856,000
Equity in income of investments in real estate partnerships (note 4) | 56,518,000 | 22,508,000 | 31,270,000
Payments to Acquire Businesses, Gross | 387,528,000 | 86,657,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 0 | 42,799,000 |
Investments in real estate partnerships (note 4) | 296,699,000 | 306,206,000 |
Columbia Regency Partners II, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Equity in income of investments in real estate partnerships (note 4) | $ 3,240,000 | $ 755,000 |
Equity Method Investment, Ownership Percentage | 0.00% | 0.00% |
Investments in real estate partnerships (note 4) | $ 14,750,000 | $ 8,496,000 |
GRI - Regency, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Equity in income of investments in real estate partnerships (note 4) | $ 29,791,000 | $ 18,148,000 |
Equity Method Investment, Ownership Percentage | 0.00% | 0.00% |
Investments in real estate partnerships (note 4) | $ 201,240,000 | $ 220,099,000 |
Other Investments in Real Estate Partnerships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Equity in income of investments in real estate partnerships (note 4) | $ 16,352,000 | $ 1,857,000 |
Equity Method Investment, Ownership Percentage | 0.00% | 0.00% |
Investments in real estate partnerships (note 4) | $ 24,453,000 | $ 32,371,000 |
RegCal, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Equity in income of investments in real estate partnerships (note 4) | $ 1,080,000 | $ 576,000 |
Equity Method Investment, Ownership Percentage | 0.00% | 0.00% |
Investments in real estate partnerships (note 4) | $ 21,516,000 | $ 17,967,000 |
Unconsolidated Properties [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Payments to Acquire Businesses, Gross | 92,550,000 | 0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 35,076,000 |  |
Unconsolidated Properties [Member] | Applewood Village [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Effective Date of Acquisition | Mar. 24, 2016 |  |
Business Acquisition, Name of Acquired Entity | Applewood Village Shops |  |
Business Acquisition Location, City and State | Denver, CO |  |
Business Acquisition, Description of Acquired Entity | Operating (1) |  |
Business Acquisition, Co-investment Partner | GRIR |  |
Equity Method Investment, Ownership Percentage | 40.00% |  |
Payments to Acquire Businesses, Gross | $ 200,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 0 |  |
Unconsolidated Properties [Member] | Garden City [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Effective Date of Acquisition | Dec. 20, 2016 |  |
Business Acquisition, Name of Acquired Entity | Plaza Venezia |  |
Business Acquisition Location, City and State | Orlando, FL |  |
Business Acquisition, Description of Acquired Entity | Operating |  |
Business Acquisition, Co-investment Partner | Columbia II |  |
Equity Method Investment, Ownership Percentage | 20.00% |  |
Payments to Acquire Businesses, Gross | $ 92,350,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 35,076,000 |  |
Partnership Interest [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Proceeds from sale of real estate investments | 135,269,000 | 108,822,000 | 118,787,000
Equity in income of investments in real estate partnerships (note 4) | 56,518,000 | 22,508,000 | 31,270,000
Mortgage loans assumed for the acquisition of real estate | 0 | 42,799,000 | $ 103,187,000
Investments in real estate partnerships (note 4) | $ 296,699,000 | $ 306,206,000 |
Operating Segments [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of Real Estate Properties Sold | property | 11 | 5 | 11
Operating Segments [Member] | Unconsolidated Properties [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of Real Estate Properties Sold | property | 10 | 2 | 6
Land [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of Real Estate Properties Sold | property | 16 | 2 | 6
Land [Member] | Unconsolidated Properties [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of Real Estate Properties Sold | property | 1 | 0 | 2
Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 27,863,000 | $ 64,482,000 |
Off-Market Favorable Lease [Member] | Unconsolidated Properties [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 6,899,000 |  |
Off-Market Favorable Lease [Member] | Unconsolidated Properties [Member] | Applewood Village [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |  |
Off-Market Favorable Lease [Member] | Unconsolidated Properties [Member] | Garden City [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 6,899,000 |  |
Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 19,141,000 | $ 14,039,000 |
Off-Market Lease, Unfavorable [Member] | Unconsolidated Properties [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 11,548,000 |  |
Off-Market Lease, Unfavorable [Member] | Unconsolidated Properties [Member] | Applewood Village [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |  |
Off-Market Lease, Unfavorable [Member] | Unconsolidated Properties [Member] | Garden City [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 11,548,000 |  |

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- Definition With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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