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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2015
Fair Value Disclosures [Abstract] |
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value | We use a market approach for our recurring fair value measurements and endeavor to use the best information available. Accordingly, valuation techniques that maximize the use of observable impacts are favored. The following tables present the fair value hierarchy table for assets and liabilities measured at fair value, on a recurring basis (in thousands):
| Fair Value Measurements at December 31, 2015 Using: |
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total Carrying Value as of December 31, 2015 |
Trading securities held in the deferred compensation plans | $ | 62,376 |  |  | $ | ¾ |  |  | $ | ¾ |  |  | $ | 62,376 |
Derivatives | –swaps |  | ¾ |  |  |  | 283,276 |  |  |  | ¾ |  |  |  | 283,276 |
| –basis swaps |  | ¾ |  |  |  | 4,329 |  |  |  | ¾ |  |  |  | 4,329 |
| Fair Value Measurements at December 31, 2014 Using: |
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total Carrying Value as of December 31, 2014 |
Trading securities held in the deferred compensation plans | $ | 68,454 |  |  | $ | — |  |  | $ | — |  |  | $ | 68,454 |
Derivatives | –swaps |  | — |  |  |  | 344,216 |  |  |  | — |  |  |  | 344,216 |
| –collars |  | — |  |  |  | 57,460 |  |  |  | — |  |  |  | 57,460 |
| –basis swaps |  | — |  |  |  | 1,687 |  |  |  | — |  |  |  | 1,687 |
Value of Assets Measured at Fair Value on Non Recurring Basis | The following table presents the value of these assets measured at fair value on a nonrecurring basis at the time impairment was recorded (in thousands):
| Year Ended December 31, |
| 2015 |  |  | 2014 |  |  | 2013 |
| Fair Value |  | Impairment |  | Fair Value |  |  | Impairment |  |  | Fair Value |  |  | Impairment |
Natural gas and oil properties | $ | 152,230 |  |  | $ | 590,174 |  |  | $ | 15,605 |  |  | $ | 28,024 |  |  | $ | 500 |  |  | $ | 7,012 |
Surface property |  | ¾ |  |  |  | ¾ |  |  |  | ¾ |  |  |  | ¾ |  |  |  | 5,550 |  |  |  | 741 |
Carrying Amounts and Fair Values of Financial Instruments | The following table presents the carrying amounts and the fair values of our financial instruments as of December 31, 2015 and 2014 (in thousands):
| December 31, 2015 |  |  | December 31, 2014 |
| Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity swaps, collars and basis swaps | $ | 288,762 |  |  | $ | 288,762 |  |  | $ | 403,363 |  |  | $ | 403,363 |
Marketable securities(a) |  | 62,376 |  |  |  | 62,376 |  |  |  | 68,454 |  |  |  | 68,454 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity swaps, collars and basis swaps |  | (1,157 | ) |  |  | (1,157 | ) |  |  | ¾ |  |  |  | ¾ |
Bank credit facility(b) |  | (95,000 | ) |  |  | (95,000 | ) |  |  | (723,000 | ) |  |  | (723,000 | )
Deferred compensation plan(c) |  | (122,918 | ) |  |  | (122,918 | ) |  |  | (203,433 | ) |  |  | (203,433 | )
4.875% senior notes due 2025(b) |  | (750,000 | ) |  |  | (572,813 | ) |  |  | ¾ |  |  |  | ¾ |
6.75% senior subordinated notes due 2020(b) |  | ¾ |  |  |  | ¾ |  |  |  | (500,000 | ) |  |  | (523,125 | )
5.75% senior subordinated notes due 2021(b) |  | (500,000 | ) |  |  | (396,250 | ) |  |  | (500,000 | ) |  |  | (520,000 | )
5.00% senior subordinated notes due 2022(b) |  | (600,000 | ) |  |  | (447,000 | ) |  |  | (600,000 | ) |  |  | (601,500 | )
5.00% senior subordinated notes due 2023(b) |  | (750,000 | ) |  |  | (551,250 | ) |  |  | (750,000 | ) |  |  | (754,688 | )
(a) | Marketable securities are held in our deferred compensation plans that are actively traded on major exchanges.
(b) | The book value of our bank debt approximates fair value because of its floating rate structure. The fair value of our senior notes and our senior subordinated notes is based on end of period market quotes, which are Level 2 inputs.
(c) | The fair value of our deferred compensation plan is updated based on closing prices on the balance sheet date.

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19296-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: 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=49121117&loc=d3e13476-108611 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=36462937&loc=d3e19207-110258 Reference 3: 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=49121117&loc=d3e13467-108611 Reference 4: 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 5: 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 6: 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=49121117&loc=d3e13433-108611 + 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=36462937&loc=d3e19190-110258 + Details
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