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Real Estate Investments (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |
Document Fiscal Year Focus | 2016 |  |
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 |
Northgate Ph II [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Effective Date of Acquisition |  | Dec. 29, 2015 |
Business Acquisition, Name of Acquired Entity |  | Northgate Ph II |
Business Acquisition Location, City and State |  | Medford, OR |
Business Acquisition, Property type |  | Development |
Payments to Acquire Businesses, Gross |  | $ 4,000,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | $ 0 |
University Commons [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Effective Date of Acquisition |  | Sep. 01, 2015 |
Business Acquisition, Name of Acquired Entity |  | University Commons |
Business Acquisition Location, City and State |  | Boca Raton, FL |
Business Acquisition, Property type |  | Operating |
Payments to Acquire Businesses, Gross |  | $ 80,500,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | $ 42,799,000 |
Garden City [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Effective Date of Acquisition | Feb. 22, 2016 |  |
Business Acquisition, Name of Acquired Entity | Garden City Park |  |
Business Acquisition Location, City and State | Garden City Park, NY |  |
Business Acquisition, Property type | Operating |  |
Payments to Acquire Businesses, Gross | $ 17,300,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 0 |  |
The Market at Springwoods Village [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 53.00% |  |
Business Acquisition, Effective Date of Acquisition | Mar. 04, 2016 |  |
Business Acquisition, Name of Acquired Entity | The Market at Springwoods Village (1) |  |
Business Acquisition Location, City and State | Houston, TX |  |
Business Acquisition, Property type | Development |  |
Payments to Acquire Businesses, Gross | $ 17,994,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 0 |  |
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value | $ 8,400,000 |  |
Market Common Clarendon [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Effective Date of Acquisition | May 16, 2016 |  |
Business Acquisition, Name of Acquired Entity | Market Common Clarendon |  |
Business Acquisition Location, City and State | Arlington, VA |  |
Business Acquisition, Property type | Operating |  |
Payments to Acquire Businesses, Gross | $ 280,500,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 0 |  |
Klahanie Shopping Center [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Effective Date of Acquisition | Jul. 15, 2016 |  |
Business Acquisition, Name of Acquired Entity | Klahanie Shopping Center |  |
Business Acquisition Location, City and State | Sammamish, WA |  |
Business Acquisition, Property type | Operating |  |
Payments to Acquire Businesses, Gross | $ 35,988,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 0 |  |
The Village at Tustin Legacy [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Effective Date of Acquisition | Aug. 04, 2016 |  |
Business Acquisition, Name of Acquired Entity | The Village at Tustin Legacy |  |
Business Acquisition Location, City and State | Tustin, CA |  |
Business Acquisition, Property type | Development |  |
Payments to Acquire Businesses, Gross | $ 18,800,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 0 |  |
Nocatee Phase III [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Effective Date of Acquisition | Oct. 26, 2016 |  |
Business Acquisition, Name of Acquired Entity | Nocatee Phase III |  |
Business Acquisition Location, City and State | Jacksonville, FL |  |
Business Acquisition, Property type | Development |  |
Payments to Acquire Businesses, Gross | $ 240,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 0 |  |
Brooklyn Station Phase II [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Effective Date of Acquisition | Oct. 30, 2016 |  |
Business Acquisition, Name of Acquired Entity | Brooklyn Station Phase II |  |
Business Acquisition Location, City and State | Jacksonville, FL |  |
Business Acquisition, Property type | Development |  |
Payments to Acquire Businesses, Gross | $ 50,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 0 |  |
The Village at Riverstone [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Effective Date of Acquisition | Dec. 06, 2016 |  |
Business Acquisition, Name of Acquired Entity | The Village at Riverstone |  |
Business Acquisition Location, City and State | Houston, TX |  |
Business Acquisition, Property type | Development |  |
Payments to Acquire Businesses, Gross | $ 16,656,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 0 |  |
CityLine Market Ph II [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Effective Date of Acquisition |  | Oct. 09, 2015 |
Business Acquisition, Name of Acquired Entity |  | CityLine Market Ph II |
Business Acquisition Location, City and State |  | Dallas, TX |
Business Acquisition, Property type |  | Development |
Payments to Acquire Businesses, Gross |  | $ 2,157,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 0 |
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 |  |
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] | Northgate Ph II [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 0 |
Off-Market Favorable Lease [Member] | University Commons [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 64,482,000 |
Off-Market Favorable Lease [Member] | Garden City [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 10,171,000 |  |
Off-Market Favorable Lease [Member] | The Market at Springwoods Village [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |  |
Off-Market Favorable Lease [Member] | Market Common Clarendon [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 15,428,000 |  |
Off-Market Favorable Lease [Member] | Klahanie Shopping Center [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 2,264,000 |  |
Off-Market Favorable Lease [Member] | The Village at Tustin Legacy [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |  |
Off-Market Favorable Lease [Member] | Nocatee Phase III [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |  |
Off-Market Favorable Lease [Member] | Brooklyn Station Phase II [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |  |
Off-Market Favorable Lease [Member] | The Village at Riverstone [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |  |
Off-Market Favorable Lease [Member] | CityLine Market Ph II [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] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 6,899,000 |  |
Parent Company [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain | 0 | 0 | $ 18,271,000
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value | 0 | 0 | 15,385,000
Mortgage loans assumed for the acquisition of real estate | $ 0 | 42,799,000 | $ 103,187,000
Parent Company [Member] | Leases, Acquired-in-Place [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 years 4 months 24 days |  |
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] | Northgate Ph II [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 0 |
Off-Market Lease, Unfavorable [Member] | University Commons [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 14,039,000 |
Off-Market Lease, Unfavorable [Member] | Garden City [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 2,940,000 |  |
Off-Market Lease, Unfavorable [Member] | The Market at Springwoods Village [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |  |
Off-Market Lease, Unfavorable [Member] | Market Common Clarendon [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 15,662,000 |  |
Off-Market Lease, Unfavorable [Member] | Klahanie Shopping Center [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 539,000 |  |
Off-Market Lease, Unfavorable [Member] | The Village at Tustin Legacy [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |  |
Off-Market Lease, Unfavorable [Member] | Nocatee Phase III [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |  |
Off-Market Lease, Unfavorable [Member] | Brooklyn Station Phase II [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |  |
Off-Market Lease, Unfavorable [Member] | The Village at Riverstone [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |  |
Off-Market Lease, Unfavorable [Member] | CityLine Market Ph II [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] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 11,548,000 |  |

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