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Organization and Summary of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) segment | Oct. 31, 2017 USD ($) | Sep. 30, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Amortization of above and below Market Leases | $ 3,355,000 | $ 2,842,000 | $ 3,046,000 |  |
Number of segments | segment | 1 | 1 | 1 |  |
Interest costs capitalized | $ 2,435,000 | $ 1,738,000 | $ 2,383,000 |  |
Revolving credit facility borrowing capacity | 900,000,000 |  |  | $ 900,000,000 | $ 650,000,000
Accumulated amortization | 12,667,000 | 11,268,000 |  |  |
Additional tax expense |  |  | 9,607,000 |  |
In place leases amortized to expense | 18,841,000 | 13,403,000 | $ 14,380,000 |  |
Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Deferred costs | 147,000 | 147,000 |  |  |
Accumulated amortization | 55,000 | 38,000 |  |  |
Loans Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Deferred costs | 22,682,000 | 21,157,000 |  |  |
Accumulated amortization | $ 6,337,000 | $ 6,376,000 |  |  |

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