Stock Compensation	9 Months Ended
Stock Compensation	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Compensation	STOCK COMPENSATION Stock Incentive Plan Stock Options: The Stock Incentive Plan provides for the grant of incentive stock options and non-qualified stock options to officers and key employees. Options granted under the Stock Incentive Plan provide for the purchase of Energen common stock at not less than the fair market value on the date the option was granted. The sale or transfer of the shares is limited during certain periods. All outstanding options vest within three years from date of grant and expire 10 years from the grant date. Restricted Stock: Additionally, the Stock Incentive Plan provides for the grant of restricted stock and restricted stock units. In March 2016, Energen awarded 154,633 restricted stock units with a grant-date fair value of $26.77. In May 2016, Energen awarded 39,971 and 2,869 restricted stock units with a grant-date fair value of $40.73 and $47.04, respectively. These awards have a three year vesting period and were valued based on the quoted market price of Energen’s common stock at the date of grant. Performance Share Awards: The Stock Incentive Plan also provides for the grant of performance share awards to eligible employees based on predetermined Company performance criteria at the end of an award period. The Stock Incentive Plan provides that payment of earned performance share awards be made in the form of Energen common stock. Performance share awards are valued using the Monte Carlo model which uses historical volatility and other variables to estimate the probability of satisfying the market condition of the award. Energen granted 136,191 performance share awards during the first quarter of 2016 with a three year vesting period and a grant-date fair value of $22.74. Energen granted 30,825 performance share awards during the second quarter of 2016 with a three year vesting period and a grant-date fair value of $36.83. Stock Repurchase Program During the three months and nine months ended September 30, 2016, Energen had non-cash purchases of approximately $0.1 million and $2.6 million, respectively, of Energen common stock in conjunction with tax withholdings on our non-qualified deferred compensation plan and other stock compensation. Energen had non-cash purchases of Energen common stock of $23,000 and $4.4 million during the three months and nine months September 30, 2015. Energen utilized internally generated cash flows in payment of the related tax withholdings.

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.