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Organization and Summary of Significant Accounting Policies (Narrative) (Details) (USD $) | 12 Months Ended |
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Dec. 31, 2012 segments | Dec. 31, 2011 | Dec. 31, 2010 | Oct. 31, 2012
Accounting Policies [Abstract] |  |  |  |
Number of Business Segments, Prior | 2 |  |  |
Number of segments | 1 |  |  |
Interest costs capitalized | $ 1,540,000 | $ 1,213,000 | $ 617,000 |
Equity Method Investment Ownership Percentage Acquired |  |  | 21.10% |
Business Acquisition, Cost of Acquired Entity, Purchase Price |  |  | 1,603,000 |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 500,000,000

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- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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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 -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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