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Organization and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |
Interest costs capitalized | $ 581,000 | $ 416,000 | $ 1,694,000 | $ 1,243,000 |
Revolving credit facility borrowing capacity | 650,000,000 |  | 650,000,000 |  |
Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt costs | 147,000 |  | 147,000 |  | $ 147,000
Debt costs accumulated amortization | 51,000 |  | 51,000 |  | 38,000
Notes Payable to Banks |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt costs | 24,807,000 |  | 24,807,000 |  | 21,157,000
Debt costs accumulated amortization | $ 7,928,000 |  | $ 7,928,000 |  | $ 6,376,000

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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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