Recent Transactions (Unconsolidated Joint Venture Activity) (Narrative) (Details)
$ in Thousands |
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12 Months Ended |
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Jan. 31, 2019
USD ($)
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Dec. 11, 2018
USD ($)
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Aug. 02, 2018
USD ($)
item
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Sep. 29, 2017
USD ($)
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Sep. 21, 2017
USD ($)
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Feb. 15, 2017
USD ($)
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Jan. 31, 2017
USD ($)
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Dec. 31, 2018
USD ($)
ft²
item
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Dec. 31, 2017
USD ($)
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Dec. 31, 2016
USD ($)
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Aug. 01, 2018
USD ($)
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| Real Estate Properties [Line Items] |
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| Gain (loss) on sale of investment in unconsolidated joint venture |
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$ 23,131
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$ 5,670
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| Proceeds from the sale of investments in unconsolidated joint ventures |
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98,599
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6,420
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| Investment in unconsolidated joint ventures |
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$ 11,789
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36,060
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35,930
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| Debt |
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$ 2,792,651
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| Number of units | item |
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1,317
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| Purchase price of property |
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$ 168,398
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90,068
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121,582
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| Mortgage loan |
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$ 45,242
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$ 45,734
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| Unconsolidated Joint Venture Multi-Family Properties [Member] |
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| Real Estate Properties [Line Items] |
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| Number of units | item |
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2,922
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| Multi-Family Properties [Member] |
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| Real Estate Properties [Line Items] |
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| Number of units | item |
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6,910
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| KP-MCG Curtis JV, LLC [Member] |
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| Real Estate Properties [Line Items] |
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| Gain (loss) on sale of investment in unconsolidated joint venture |
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$ 12,000
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| Proceeds from the sale of investments in unconsolidated joint ventures |
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102,500
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| Net sales proceeds held by qualified intermediary |
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$ 5,600
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| Debt |
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$ 75,000
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| KPG-P 100 IMW JV, LLC, Keystone-Penn And Keystone-Tristate [Member] |
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| Real Estate Properties [Line Items] |
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| Gain (loss) on sale of investment in unconsolidated joint venture |
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$ 7,400
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| Proceeds from the sale of investments in unconsolidated joint ventures |
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$ 9,700
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| Elmajo Urban Renewal Associates, LLC And Estuary Urban Renewal Associates, LLC [Member] | Unconsolidated Joint Venture Multi-Family Properties [Member] |
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| Real Estate Properties [Line Items] |
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| Gain (loss) on sale of investment in unconsolidated joint venture |
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$ 5,100
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| Proceeds from the sale of investments in unconsolidated joint ventures |
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$ 5,100
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| Percentage of interest in venture |
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7.50%
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| RoseGarden Monaco, L.L.C. [Member] |
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| Real Estate Properties [Line Items] |
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| Gain (loss) on sale of investment in unconsolidated joint venture |
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$ (1,400)
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| Metropolitan At 40 Park [Member] |
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| Real Estate Properties [Line Items] |
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| Purchase price of property |
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$ 1,300
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| Metropolitan At 40 Park [Member] | The Shops At 40 Park Property [Member] |
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| Real Estate Properties [Line Items] |
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| Area of property (in square feet) | ft² |
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50,973
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| Residual ownership interest |
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25.00%
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12.50%
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| Mortgage loan |
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$ 6,100
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| Metropolitan At 40 Park [Member] | Lofts At 40 Park Property [Member] |
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| Real Estate Properties [Line Items] |
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| Number of stories | item |
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5
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| Number of units | item |
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59
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| Indirect ownership interest |
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50.00%
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25.00%
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| Metropolitan At 40 Park [Member] | Unconsolidated Joint Venture Multi-Family Properties [Member] |
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| Real Estate Properties [Line Items] |
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| Percentage of interest in venture |
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25.00%
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| Number of units | item |
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130
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| Mortgage loan |
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$ 55,227
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| Marbella II [Member] | Unconsolidated Joint Venture Multi-Family Properties [Member] |
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| Real Estate Properties [Line Items] |
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| Percentage of interest in venture |
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24.27%
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| Number of units | item |
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311
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| Mortgage loan |
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$ 74,690
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| Marbella Tower Urban Renewal Associates LLC [Member] |
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| Real Estate Properties [Line Items] |
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| Percentage of interest in venture |
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24.27%
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| Percentage of additional interest acquired |
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50.00%
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| Number of units | item |
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412
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| Purchase price of property |
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$ 65,600
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| Repayment of mortgage loans |
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95,000
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| Mortgage loan |
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$ 131,000
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$ 95,000
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| Subsequent Event [Member] | Marbella II [Member] | Unconsolidated Joint Venture Multi-Family Properties [Member] |
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| Real Estate Properties [Line Items] |
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| Mortgage loan |
$ 117,000
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| Subsequent Event [Member] | Marbella Tower Urban Renewal Associates LLC [Member] | Unconsolidated Joint Venture Multi-Family Properties [Member] |
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| Real Estate Properties [Line Items] |
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| Percentage of interest in venture |
50.00%
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| Purchase price of property |
$ 77,500
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| Repayment of mortgage loans |
74,700
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| Mortgage loan |
$ 117,000
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