v2.4.0.6

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 2) (USD $) | 12 Months Ended |  | 0 Months Ended |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2012 | Dec. 31, 2012 9.0 percent notes | Feb. 02, 2013 9.0 percent notes | Jan. 17, 2013 9.0 percent notes | Oct. 12, 2012 9.0 percent notes | Dec. 31, 2012 9.0 percent notes | Dec. 31, 2011 9.0 percent notes | Dec. 31, 2012 Carrying Amount Level 1 9.0 percent notes | Dec. 31, 2011 Carrying Amount Level 1 9.0 percent notes | Dec. 31, 2012 Carrying Amount Level 2 | Dec. 31, 2011 Carrying Amount Level 2 | Dec. 31, 2012 Fair Value Level 1 9.0 percent notes | Dec. 31, 2011 Fair Value Level 1 9.0 percent notes | Dec. 31, 2012 Fair Value Level 2 | Dec. 31, 2011 Fair Value Level 2
Carrying amount and estimated fair values of fixed-rate long-term debt and natural gas forward purchase contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 9.00% |  |  |  | 9.00% |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 450,000,000 | $ 50,000,000 |  |  |  |  |  |  |  |  |  |
Make whole payment included in redemption price |  |  |  | 55,400,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of the aggregate principal amount of notes redeemed |  |  |  | 99.30% |  |  |  |  |  |  |  |  |  |  |
Redemption price |  |  |  | 502,300,000 | 51,500,000 |  |  |  |  |  |  |  |  |  |
Percentage of the remaining principal amount of notes redeemable |  |  | 0.70% |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  | 448,091,000 | 497,463,000 |  |  | 501,750,000 | 525,315,000 |  |
Long-term debt |  |  |  |  |  | 448,100,000 | 497,500,000 |  |  |  |  |  |  |  |
Natural gas forward purchase contracts liability |  |  |  |  |  |  |  |  |  | $ (6,000) | $ 721,000 |  |  | $ (6,000) | $ 721,000
Redeemable percentage of investment in the fund | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation of the investment in the fund as a percentage of investment balance at the end of the year | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Holding period of investment | 100 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly liquidation restriction as a percentage of investment balance at the end of the year | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the amount of make-whole payment that is included in the redemption price of debt instruments. + References No definition available. + Details
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- Definition Represents the percentage of the aggregate principal amount of debt instruments that redeemed. + References No definition available. + Details
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- Definition Represents the percentage of remaining principal amount of debt instruments that may be redeemed. + References No definition available. + Details
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- Definition Represents the holding period of investments in the pooled equity fund. + References No definition available. + Details
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- Definition Represents the liquidation of the investments in the pooled equity fund as a percentage of the investment balance at period end. + References No definition available. + Details
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- Definition Represents the quarterly liquidation restriction of the investments in the pooled equity fund as a percentage of investment balance at period end. + References No definition available. + Details
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- Definition Represents the redeemable percentage of investments in pooled equity fund. + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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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 Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of price risk derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 17 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
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