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Fair value measurements (Tables) | 9 Months Ended
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Sep. 30, 2011
Fair value measurements [Abstract] |
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 September 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 September 30, 2011 |
|  | (In thousands) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | - |  |  | $ | 56,194 |  |  | $ | - |  |  | $ | 56,194 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance investment contract* |  |  | - |  |  |  | 33,591 |  |  |  | - |  |  |  | 33,591 |
Auction rate securities |  |  | - |  |  |  | 11,400 |  |  |  | - |  |  |  | 11,400 |
Mortgage-backed securities |  |  | - |  |  |  | 8,570 |  |  |  | - |  |  |  | 8,570 |
U.S. Treasury securities |  |  | - |  |  |  | 1,444 |  |  |  | - |  |  |  | 1,444 |
Commodity derivative instruments - current |  |  | - |  |  |  | 38,794 |  |  |  | - |  |  |  | 38,794 |
Commodity derivative instruments - noncurrent |  |  | - |  |  |  | 15,575 |  |  |  | - |  |  |  | 15,575 |
Total assets measured at fair value |  | $ | - |  |  | $ | 165,568 |  |  | $ | - |  |  | $ | 165,568 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative instruments - current |  | $ | - |  |  | $ | 3,028 |  |  | $ | - |  |  | $ | 3,028 |
Commodity derivative instruments - noncurrent |  |  | - |  |  |  | 157 |  |  |  | - |  |  |  | 157 |
Interest rate derivative instruments - noncurrent |  |  | - |  |  |  | 3,491 |  |  |  | - |  |  |  | 3,491 |
Total liabilities measured at fair value |  | $ | - |  |  | $ | 6,676 |  |  | $ | - |  |  | $ | 6,676 |
* 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 September 30, 2010, Using |  |  |  |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Balance at September 30, 2010 |
|  | (In thousands) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 2,835 |  |  | $ | - |  |  | $ | - |  |  | $ | 2,835 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-income securities |  |  | - |  |  |  | 11,400 |  |  |  | - |  |  |  | 11,400 |
Insurance contract* |  |  | - |  |  |  | 35,902 |  |  |  | - |  |  |  | 35,902 |
Commodity derivative instruments - current |  |  | - |  |  |  | 26,803 |  |  |  | - |  |  |  | 26,803 |
Commodity derivative instruments - noncurrent |  |  | - |  |  |  | 8,423 |  |  |  | - |  |  |  | 8,423 |
Total assets measured at fair value |  | $ | 2,835 |  |  | $ | 82,528 |  |  | $ | - |  |  | $ | 85,363 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative instruments - current |  | $ | - |  |  | $ | 25,803 |  |  | $ | - |  |  | $ | 25,803 |
Commodity derivative instruments - noncurrent |  |  | - |  |  |  | 2,263 |  |  |  | - |  |  |  | 2,263 |
Total liabilities measured at fair value |  | $ | - |  |  | $ | 28,066 |  |  | $ | - |  |  | $ | 28,066 |
* Invested in mutual funds. |
|  | Fair Value Measurements at December 31, 2010, 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, 2010 |
|  | (In thousands) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | - |  |  | $ | 166,620 |  |  | $ | - |  |  | $ | 166,620 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-income securities |  |  | - |  |  |  | 11,400 |  |  |  | - |  |  |  | 11,400 |
Insurance investment contract* |  |  | - |  |  |  | 39,541 |  |  |  | - |  |  |  | 39,541 |
Commodity derivative instruments - current |  |  | - |  |  |  | 15,123 |  |  |  | - |  |  |  | 15,123 |
Commodity derivative instruments - noncurrent |  |  | - |  |  |  | 4,104 |  |  |  | - |  |  |  | 4,104 |
Total assets measured at fair value |  | $ | - |  |  | $ | 236,788 |  |  | $ | - |  |  | $ | 236,788 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative instruments - current |  | $ | - |  |  | $ | 24,428 |  |  | $ | - |  |  | $ | 24,428 |
Commodity derivative instruments - noncurrent |  |  | - |  |  |  | 6,483 |  |  |  | - |  |  |  | 6,483 |
Total liabilities measured at fair value |  | $ | - |  |  | $ | 30,911 |  |  | $ | - |  |  | $ | 30,911 |
* The insurance investment contract invests approximately 35 percent in common stock of mid-cap companies, 33 percent in common stock of small-cap companies, 31 percent in common stock of large-cap companies and 1 percent in cash and cash equivalents. |
Estimated fair value of long-term debt |
The estimated fair value of the Company's long-term debt was as follows:
|  | Carrying Amount |  |  | Fair Value |
|  | (In thousands) |
Long-term debt at September 30, 2011 |  | $ | 1,423,614 |  |  | $ | 1,568,942 |
Long-term debt at September 30, 2010 |  | $ | 1,510,588 |  |  | $ | 1,679,979 |
Long-term debt at December 31, 2010 |  | $ | 1,506,752 |  |  | $ | 1,621,184 |

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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 Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611 Reference 2: 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=6925170&loc=d3e19207-110258 Reference 3: 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 4: 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 Reference 5: 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 6: 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=6947722&loc=d3e13476-108611 Reference 7: 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 8: 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=6947722&loc=d3e13467-108611 Reference 9: 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 10: 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 11: 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 12: 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. + 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 -Topic 820 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258 + Details
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