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Long Term Debt (Details Textual) (USD $) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011 | Jun. 23, 2011
Long Term Debt (Textual) [Abstract] |  |  |
Total long-term debt | $ 116,951,000 | $ 118,481,000 |
5.68% note, due June 30, 2026 [Member] |  |  |
Long Term Debt (Textual) [Abstract] |  |  |
Total long-term debt | 29,000,000 | 29,000,000 | 29,000,000
Principal payments | 2,900,000 |  |
Rate of unsecured senior loans |  |  | 5.68%
Debt Instrument, Maturity Date | Jun. 30, 2026 |  |
9.57% bond, due May 1, 2018 [Member] |  |  |
Long Term Debt (Textual) [Abstract] |  |  |
Total long-term debt | 5,442,000 | 6,348,000 |
Rate of unsecured senior loans | 9.57% |  |
Debt Instrument, Maturity Date | May 01, 2018 |  |
10.03% bond, due May 1, 2018 [Member] |  |  |
Long Term Debt (Textual) [Abstract] |  |  |
Total long-term debt | 2,993,000 | 3,492,000 |
Rate of unsecured senior loans | 10.03% |  |
Debt Instrument, Maturity Date | May 01, 2018 |  |
9.08% bond, due June 1, 2022 [Member] |  |  |
Long Term Debt (Textual) [Abstract] |  |  |
Total long-term debt | 7,960,000 | 7,958,000 |
Rate of unsecured senior loans | 9.08% |  |
Debt Instrument, Maturity Date | Jun. 01, 2022 |  |
7.83% note, due January 1, 2015 [Member] |  |  |
Long Term Debt (Textual) [Abstract] |  |  |
Total long-term debt | 6,000,000 | 6,000,000 |
Rate of unsecured senior loans | 7.83% |  |
Debt Instrument, Maturity Date | Jan. 01, 2015 |  |
6.64% note, due October 31, 2017 [Member] |  |  |
Long Term Debt (Textual) [Abstract] |  |  |
Total long-term debt | 16,363,000 | 16,363,000 |
Rate of unsecured senior loans | 6.64% |  |
Debt Instrument, Maturity Date | Oct. 31, 2017 |  |
5.50% note, due October 12, 2020 [Member] |  |  |
Long Term Debt (Textual) [Abstract] |  |  |
Total long-term debt | 18,000,000 | 18,000,000 |
Rate of unsecured senior loans | 5.50% |  |
Debt Instrument, Maturity Date | Oct. 12, 2020 |  |
5.93% note, due October 31, 2023 [Member] |  |  |
Long Term Debt (Textual) [Abstract] |  |  |
Total long-term debt | 30,000,000 | 30,000,000 |
Rate of unsecured senior loans | 5.93% |  |
Debt Instrument, Maturity Date | Oct. 31, 2023 |  |
8.25% due March 1, 2014 [Member] |  |  |
Long Term Debt (Textual) [Abstract] |  |  |
Total long-term debt | 1,038,000 | 1,134,000 |
Rate of unsecured senior loans | 8.25% |  |
Debt Instrument, Maturity Date | Mar. 01, 2014 |  |
Unsecured Senior Notes [Member] |  |  |
Long Term Debt (Textual) [Abstract] |  |  |
Unsecured senior notes issue | $ 7,000,000 |  |
Unsecured Senior Notes [Member] | Maximum [Member] |  |  |
Long Term Debt (Textual) [Abstract] |  |  |
Rate of unsecured senior loans | 6.43% |  |
Unsecured Senior Notes [Member] | Minimum [Member] |  |  |
Long Term Debt (Textual) [Abstract] |  |  |
Rate of unsecured senior loans | 5.28% |  |
First Mortgage Bond One [Member] |  |  |
Long Term Debt (Textual) [Abstract] |  |  |
Rate of unsecured senior loans |  |  | 6.85%
First Mortgage Bond Two [Member] |  |  |
Long Term Debt (Textual) [Abstract] |  |  |
Rate of unsecured senior loans |  |  | 4.90%

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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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