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Organization and Summary of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) segment | Dec. 31, 2014 USD ($) segment | Dec. 31, 2013 USD ($) segment
Debt Instrument [Line Items] |  |  |
Number of segments | segment | 1 | 1 | 1
Interest costs capitalized | $ 2,383,000 | $ 1,629,000 | $ 1,369,000
Revolving credit facility borrowing capacity | 650,000,000 |  |
Accumulated amortization | 9,877,000 | 8,514,000 |
Additional tax expense | 9,607,000 |  |
Mortgages |  |  |
Debt Instrument [Line Items] |  |  |
Deferred costs | 226,000 | 226,000 |
Accumulated amortization | 93,000 | 69,000 |
Loans Payable |  |  |
Debt Instrument [Line Items] |  |  |
Deferred costs | 17,782,000 | 16,775,000 |
Accumulated amortization | $ 4,704,000 | $ 5,769,000 |

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