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Organization and Summary of Significant Accounting Policies (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 segment | Dec. 31, 2013 segment | Dec. 31, 2012 segment
Accounting Policies [Abstract] |  |  |
Number of segments | 1 us-gaap_NumberOfReportableSegments | 1 us-gaap_NumberOfReportableSegments | 1 us-gaap_NumberOfReportableSegments
Interest costs capitalized | $ 1,629,000 us-gaap_InterestCostsCapitalized | $ 1,369,000 us-gaap_InterestCostsCapitalized | $ 1,540,000 us-gaap_InterestCostsCapitalized
Revolving credit facility borrowing capacity | $ 650,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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