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Fair value measurements (Tables) | 6 Months Ended
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Jun. 30, 2012
Fair Value Disclosures [Abstract] |
Available-for-sale securities | Details of available-for-sale securities were as follows:
June 30, 2012 | Cost | Gross Unrealized Gains | Gross Unrealized Losses | Fair Value
| (In thousands)
Insurance investment contract | $ | 37,250 |  | $ | 8,709 |  | $ | — |  | $ | 45,959 |
Mortgage-backed securities | 8,130 |  | 128 |  | (5 | ) | 8,253 |
U.S. Treasury securities | 1,958 |  | 37 |  | (1 | ) | 1,994 |
Total | $ | 47,338 |  | $ | 8,874 |  | $ | (6 | ) | $ | 56,206 |
December 31, 2011 | Cost | Gross Unrealized Gains | Gross Unrealized Losses | Fair Value
| (In thousands)
Insurance investment contract | $ | 31,884 |  | $ | 6,468 |  | $ | — |  | $ | 38,352 |
Auction rate securities | 11,400 |  | — |  | — |  | 11,400 |
Mortgage-backed securities | 8,206 |  | 95 |  | (5 | ) | 8,296 |
U.S. Treasury securities | 1,619 |  | 37 |  | — |  | 1,656 |
Total | $ | 53,109 |  | $ | 6,600 |  | $ | (5 | ) | $ | 59,704 |
Assets and liabilities measured at fair value on a recurring basis | The Company's assets and liabilities measured at fair value on a recurring basis are as follows:
| Fair Value Measurements at June 30, 2012, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Balance at June 30, 2012
| (In thousands)
Assets: |  |  |  |
Money market funds | $ | — |  | $ | 21,054 |  | $ | — |  | $ | 21,054 |
Available-for-sale securities: |  |  |  |
Insurance investment contract* | — |  | 45,959 |  | — |  | 45,959 |
Mortgage-backed securities | — |  | 8,253 |  | — |  | 8,253 |
U.S. Treasury securities | — |  | 1,994 |  | — |  | 1,994 |
Commodity derivative instruments | — |  | 48,657 |  | — |  | 48,657 |
Total assets measured at fair value | $ | — |  | $ | 125,917 |  | $ | — |  | $ | 125,917 |
Liabilities: |  |  |  |
Commodity derivative instruments | $ | — |  | $ | 1,037 |  | $ | — |  | $ | 1,037 |
Interest rate derivative instruments | — |  | 6,963 |  | — |  | 6,963 |
Total liabilities measured at fair value | $ | — |  | $ | 8,000 |  | $ | — |  | $ | 8,000 |
* The insurance investment contract invests approximately 28 percent in common stock of mid-cap companies, 28 percent in common stock of small-cap companies, 29 percent in common stock of large-cap companies and 15 percent in fixed-income and other investments.
| Fair Value Measurements at June 30, 2011, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Balance at June 30, 2011
| (In thousands)
Assets: |  |  |  |
Money market funds | $ | — |  | $ | 8,297 |  | $ | — |  | $ | 8,297 |
Available-for-sale securities: |  |  |  |
Insurance investment contract* | — |  | 40,328 |  | — |  | 40,328 |
Auction rate securities | — |  | 11,400 |  | — |  | 11,400 |
Mortgage-backed securities | — |  | 8,162 |  | — |  | 8,162 |
U.S. Treasury securities | — |  | 1,969 |  | — |  | 1,969 |
Commodity derivative instruments | — |  | 20,499 |  | — |  | 20,499 |
Total assets measured at fair value | $ | — |  | $ | 90,655 |  | $ | — |  | $ | 90,655 |
Liabilities: |  |  |  |
Commodity derivative instruments | $ | — |  | $ | 25,421 |  | $ | — |  | $ | 25,421 |
Total liabilities measured at fair value | $ | — |  | $ | 25,421 |  | $ | — |  | $ | 25,421 |
* The insurance investment contract invests approximately 34 percent in common stock of mid-cap companies, 33 percent in common stock of small-cap companies, 32 percent in common stock of large-cap companies and 1 percent in cash and cash equivalents.
| Fair Value Measurements at December 31, 2011, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Balance at December 31, 2011
| (In thousands)
Assets: |  |  |  |
Money market funds | $ | — |  | $ | 97,500 |  | $ | — |  | $ | 97,500 |
Available-for-sale securities: |  |  |  |
Insurance investment contract* | — |  | 38,352 |  | — |  | 38,352 |
Auction rate securities | — |  | 11,400 |  | — |  | 11,400 |
Mortgage-backed securities | — |  | 8,296 |  | — |  | 8,296 |
U.S. Treasury securities | — |  | 1,656 |  | — |  | 1,656 |
Commodity derivative instruments | — |  | 30,455 |  | — |  | 30,455 |
Total assets measured at fair value | $ | — |  | $ | 187,659 |  | $ | — |  | $ | 187,659 |
Liabilities: |  |  |  |
Commodity derivative instruments | $ | — |  | $ | 14,101 |  | $ | — |  | $ | 14,101 |
Interest rate derivative instruments | — |  | 4,762 |  | — |  | 4,762 |
Total liabilities measured at fair value | $ | — |  | $ | 18,863 |  | $ | — |  | $ | 18,863 |
* The insurance investment contract invests approximately 33 percent in common stock of mid-cap companies, 34 percent in common stock of small-cap companies, 32 percent in common stock of large-cap companies and 1 percent in cash and cash equivalents.
Fair value of long term debt outstanding | The estimated fair value of the Company's Level 2 long-term debt was as follows:
| Carrying Amount | Fair Value
| (In thousands)
Long-term debt at June 30, 2012 | $ | 1,665,631 |  | $ | 1,839,430 |
Long-term debt at June 30, 2011 | $ | 1,432,105 |  | $ | 1,550,592 |
Long-term debt at December 31, 2011 | $ | 1,424,678 |  | $ | 1,592,807 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, 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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, 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. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 14 -Subparagraph a -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 Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph c(2), d, e, f -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 3: 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=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15 -Subparagraph b-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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 19 -Subparagraph a, b, c(1), d(1) -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a, c(1), c(2), c(3), 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. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -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 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 + Details
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