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Organization and Summary of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) segment | Dec. 31, 2014 USD ($) segment
Debt Instrument [Line Items] |  |  |
Number of segments | segment | 1 | 1 | 1
Interest costs capitalized | $ 1,738,000 | $ 2,383,000 | $ 1,629,000
Restricted cash and cash held in escrow | 0 | 601,000 |
Revolving credit facility borrowing capacity | 650,000,000 |  |
Accumulated amortization | 11,268,000 | 9,877,000 |
Additional tax expense |  | 9,607,000 |
Mortgages |  |  |
Debt Instrument [Line Items] |  |  |
Deferred costs | 147,000 | 226,000 |
Accumulated amortization | $ 38,000 | 93,000 |
Loans Payable |  |  |
Debt Instrument [Line Items] |  |  |
Deferred costs |  | 21,157,000 | 17,782,000
Accumulated amortization |  | $ 6,376,000 | $ 4,704,000

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