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Stock-Based Compensation - Narrative (Details) |  |  |  | 1 Months Ended | 12 Months Ended
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Feb. 22, 2016 USD ($) shares | Feb. 19, 2016 performance_criteria | Jan. 05, 2016 USD ($) shares | Jan. 31, 2018 USD ($) | Feb. 28, 2015 | Dec. 31, 2017 USD ($) Award_Type shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 34,000,000 | $ 26,000,000 | $ 13,700,000
Excess tax expense for stock-based compensation |  |  |  |  |  | 3,000,000 |  |
Stock-based compensation tax benefit |  |  |  |  |  |  | 2,126,000 |
Stock-based compensation tax benefit |  |  |  |  |  |  |  | 0
Defined contribution cost recognized |  |  |  |  |  | $ 2,600,000 |  |
Deferred Compensation, Share-based Payments |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common shares held in employee trust earned but not distributed (in shares) | shares |  |  |  |  |  | 495,774 |  |
Shares issued in period (in shares) | shares |  |  |  |  |  | 0 |  |
Restricted Stock Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 500,000 | 400,000 | 400,000
Award vesting period |  |  |  |  |  | 3 years |  |
Compensation cost not yet recognized |  |  |  |  |  | $ 4,000,000 |  |
Fair value of award |  |  |  |  |  | $ 900,000 | 200,000 | 200,000
Period of recognition for unrecognized compensation costs |  |  |  |  |  | 2 years |  |
Aggregate intrinsic value |  |  |  |  |  | $ 4,600,000 |  |
Weighted-average remaining contractual term of non-vested shares |  |  |  |  |  | 1 year 4 months 18 days |  |
Restricted Stock Awards | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expected forfeiture rate |  |  |  |  |  | 5.00% |  |
Restricted Stock Awards | Graduated or graded vesting | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  | 3 years |  |
Restricted Stock Awards | Graduated or graded vesting | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  | 4 years |  |
Restricted Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 1,400,000 | 1,400,000 | 1,400,000
Aggregate intrinsic value |  |  |  |  |  | $ 11,700,000 |  |
Stock Appreciation Rights |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Term of award |  |  |  |  |  | 7 years |  |
Aggregate intrinsic value |  |  |  |  |  | $ 600,000 |  |
Weighted-average remaining contractual term of non-vested shares |  |  |  |  |  | 1 year 1 month |  |
Stock Appreciation Rights | Graduated or graded vesting |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  | 3 years |  |
Award vesting percentage |  |  |  |  |  | 33.33% |  |
Performance Shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 29,100,000 | 21,300,000 | 18,300,000
Award vesting period |  |  |  |  |  | 3 years |  |
Compensation cost not yet recognized |  |  |  |  |  | $ 20,700,000 |  |
Number of performance award types | Award_Type |  |  |  |  |  | 3 |  |
Period of recognition for unrecognized compensation costs |  |  |  |  |  | 11 months 4 days |  |
Aggregate intrinsic value |  |  |  |  |  | $ 79,500,000 |  |
Weighted-average remaining contractual term of non-vested shares |  |  |  |  |  | 1 year 1 month 25 days |  |
Number of performance awards where the performance period has ended | Award_Type |  |  |  |  |  | 2 |  |
Performance Shares | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expected forfeiture rate |  |  |  |  |  | 0.00% |  |
Performance Shares | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expected forfeiture rate |  |  |  |  |  | 5.00% |  |
Internal Metrics Performance Share Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of performance award types | Award_Type |  |  |  |  |  | 2 |  |
Rights to share portion of award, maximum percent |  |  |  |  |  | 100.00% |  |
Market Based Performance Share Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of performance award types | Award_Type |  |  |  |  |  | 1 |  |
Rights to share portion of award, maximum percent |  |  |  |  |  | 100.00% |  |
Rights to cash portion of award, maximum percent |  |  |  |  |  | 100.00% |  |
Employee Performance Share Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years | 3 years |  |
Number of performance criteria | performance_criteria |  | 3 |  |  |  |  |  |
Number of performance awards issued and certified (in shares) | shares | 317,790 |  |  |  |  |  |  |
Grant date fair value of performance shares issued and certified | $ 8,800,000 |  |  |  |  |  |  |
Employee Performance Share Awards | Performance metric: average production |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  | 33.33% |  |
Employee Performance Share Awards | Performance metric: average finding costs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  | 33.33% |  |
Employee Performance Share Awards | Performance metric: average reserve replacement |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  | 33.33% |  |
Hybrid Performance Shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Minimum operating cash flow for performance based award |  |  |  |  |  | $ 100,000,000 |  |
Hybrid Performance Shares | Graduated or graded vesting |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  | 3 years |  |
Hybrid Performance Shares | 25% vesting on first and second anniversary |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  | 25.00% |  |
Hybrid Performance Shares | 50% vesting on third anniversary |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  | 50.00% |  |
TSR Performance Share Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Performance period of peer group |  |  |  |  |  | 3 years |  |
Cash payments for share-based compensation |  |  |  |  |  | $ 0 | 1,800,000 | $ 7,000,000
Number of performance awards issued and certified (in shares) | shares |  |  | 292,421 |  |  |  |  |
Grant date fair value of performance shares issued and certified |  |  | $ 5,600,000 |  |  |  |  |
TSR Performance Share Awards | Liability |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Current portion of share-based liability |  |  |  |  |  | 3,300,000 | 0 |
Noncurrent portion of share-based liability |  |  |  |  |  | 6,600,000 | $ 2,100,000 |
SEIP |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 0 |  |
Percent of aggregate distribution paid immediately |  |  |  |  |  | 25.00% |  |
Percent of aggregate distribution paid subsequently |  |  |  |  |  | 75.00% |  |
Subsequent Event | TSR Performance Share Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Payments for stock-based compensation |  |  |  | $ 3,300,000 |  |  |  |

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- Definition The grant date fair value of the equity award other than option which was achieved based on performance and vested within the period. + References No definition available. + Details
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- Definition The intrinsic value of vested and nonvested awards on equity-based plans excluding option plans (for example, stock appreciation rights plans) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units, as calculated by applying the disclosed pricing methodology. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11374-113907 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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