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Derivative Instruments And Hedging Activities (Tables) | 12 Months Ended
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Dec. 31, 2011
Derivative Instruments And Hedging Activities [Abstract] |
Derivatives Designated As Hedging Instruments |
| As of December 31, 2011 |  | As of December 31, 2010 |
| Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value |
Asset Derivatives: |  |  |  |  |  |  |  |
Natural gas contracts | Other current assets |  | $ | 12,957 |  | Other current assets |  | $ | 5,324 |
Oil contracts | Other current assets |  |  | 8,567 |  | Other current assets |  |  | — |
Natural gas contracts | Other assets |  |  | 857 |  | Other assets |  |  | — |
Interest rate swaps | Other assets |  |  | 327 |  | Other assets |  |  | — |
|  |  | $ | 22,708 |  |  |  | $ | 5,324 |
| As of December 31, 2011 |  | As of December 31, 2010 |
| Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value |
Liability Derivatives: |  |  |  |  |  |  |  |
Oil contracts | Accrued liabilities |  | $ | 886 |  | Accrued liabilities |  | $ | 28,855 |
Interest rate swaps | Accrued liabilities |  |  | 202 |  | Accrued liabilities |  |  | 1,751 |
Gas contracts | Other long-term liabilities |  |  | — |  | Other long-term liabilities |  |  | 913 |
Oil contracts | Other long-term liabilities |  |  | 1,711 |  | Other long-term liabilities |  |  | — |
Interest rate swaps | Other long-term liabilities |  |  | — |  | Other long-term liabilities |  |  | 115 |
|  |  | $ | 2,799 |  |  |  | $ | 31,634 |
Derivatives Not Designated As Hedging Instruments |
| As of December 31, 2011 |  | As of December 31, 2010 |
| Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value |
Asset Derivatives: |  |  |  |  |  |  |  |
Foreign exchange forwards | Other current assets |  | $ | 55 |  | Other current assets |  | $ | 148 |
Foreign exchange forwards | Other assets |  |  | — |  | Other assets |  |  | 42 |
|  |  | $ | 55 |  |  |  | $ | 190 |
| As of December 31, 2011 |  | As of December 31, 2010 |
| Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value |
Liability Derivatives: |  |  |  |  |  |  |  |
Foreign exchange forwards | Accrued liabilities |  | $ | 159 |  | Accrued liabilities |  | $ | — |
|  |  | $ | 159 |  |  |  | $ | — |
Impact Of Derivative Instruments On Accumulated Comprehensive Income (Loss) |
|  | Gain (Loss) Recognized in OCI on Derivatives |
|  |  | 2011(1) |  |  |  | 2010 |  |  |  | 2009 |
Oil and natural gas commodity contracts |  | $ | 28,749 |  |  | $ | (6,486 | ) |  | $ | (19,092 | )
Foreign exchange forwards |  |  | — |  |  |  | — |  |  |  | (538 | )
Interest rate swaps |  |  | 1,294 |  |  |  | (1,213 | ) |  |  | 712 |
|  | $ | 30,043 |  |  | $ | (7,699 | ) |  | $ | (18,918 | )
(1) | All unrealized gains (losses) related to our derivatives are expected to be reclassified into earnings by no later than December 31, 2014. The last of our interest rate swaps will be settled in January 2014. The last of our oil and natural gas commodity contracts will settle in December 2013. Most of our unrealized gain (losses) in OCI at December 31, 2011 is expected to be reclassified to earnings in 2012, including $13.4 million for our oil and natural gas contracts and $(0.1) million related to our interest swap contracts.
Gain (Loss) Reclassified From Accumulated OCI Into Income |
| Location of Gain (Loss) Reclassified from Accumulated OCI into Income |  |  | Gain (Loss) Reclassified from Accumulated OCI into Income |
|  |  | Years Ended December 31, |
|  |  | 2011 |  |  |  | 2010 |  |  |  | 2009 |
Oil and natural gas commodity contracts | Oil and Gas Revenues |  | $ | (21,659 | ) |  | $ | 25,575 |  |  | $ | 16,972 |
Interest rate swaps | Net interest expense |  |  | (2,010 | ) |  |  | (1,849 | ) |  |  | (1,096 | )
|  |  | $ | (23,669 | ) |  | $ | 23,726 |  |  | $ | 15,876 |
Impact Of Non-Designated Derivative Instruments On Income Statement |
| Location of Gain (Loss) Recognized in Income on Derivatives |  |  | Gain (Loss) Recognized in Income on Derivatives |
|  |  | Years Ended December 31, |
|  |  | 2011 |  |  |  | 2010 |  |  |  | 2009 |
Natural gas contracts | Gain on oil and gas derivative contracts |  | $ | — |  |  | $ | 1,088 |  |  | $ | 89,485 |
Foreign exchange forwards | Other income (expense) |  |  | 249 |  |  |  | (2,560 | ) |  |  | 3,279 |
Interest rate swaps | Other income (expense) |  |  | — |  |  |  | — |  |  |  | (468 | )
|  |  | $ | 249 |  |  | $ | (1,472 | ) |  | $ | 92,296 |

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- Definition Tabular disclosure of the effective portion of gains and losses on derivative instruments (and nonderivative instruments) designated and qualifying in cash flow hedges recorded in accumulated other comprehensive income (loss) during the term of the hedging relationship and reclassified into earnings during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 815 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c) -Name Accounting Standards Codification -Paragraph 4C -Section 50 -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure for cash flow hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 815 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (b) -Name Accounting Standards Codification -Paragraph 4C -Section 50 -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the effective portion of the gains and losses on derivative instruments designated (and non-derivative instruments) designated and qualifying in cash flow hedges and net investment hedges that was recognized in other comprehensive income (loss) during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 815 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (b) -Name Accounting Standards Codification -Paragraph 4C -Section 50 -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 + Details
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