Share-Based Compensation and Other Benefit Plans	9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation and Other Benefit Plans	Share-Based Compensation and Other Benefit Plans Share-Based Compensation We recognize share-based compensation expense related to our share-based compensation plans as a component of G&A expenses in our Condensed Consolidated Statements of Operations. We reserved 749,600 shares of common stock for issuance under the Penn Virginia Corporation Management Incentive Plan for future share-based compensation awards. A total of 347,440 RSUs and 98,526 PRSUs have been granted to employees and directors as of September 30, 2018. We recognized $1.0 million and $1.0 million and $3.5 million and $2.7 million of expense attributable to the RSUs and PRSUs for the three and nine months ended September 30, 2018 and 2017, respectively. Approximately $0.6 million of the expense for the nine months ended September 30, 2018 was attributable to the accelerated vesting of certain awards of our former Executive Chairman. In the nine months ended September 30, 2018 and 2017, we granted 42,459 and 190,891 RSUs to certain employees and a new member of the board of directors with an average grant-date fair value of $65.96 and $48.70 per RSU, respectively. The RSUs are being charged to expense on a straight-line basis over a range of four to five years. In the nine months ended September 30, 2018, 53,411 shares vested, net of shares withheld for income taxes. In the nine months ended September 30, 2017, we granted 98,526 PRSUs to members of our management. No PRSUs were granted during the nine months ended September 30, 2018. In the nine months ended September 30, 2018, 1,495 shares vested, net of shares withheld for income taxes. The PRSUs were issued collectively in two to three separate tranches with individual three-year performance periods beginning in January 2017, 2018 and 2019, respectively. Vesting of the PRSUs can range from zero to 200 percent of the original grant based on the performance of our common stock relative to an industry index. Due to their market condition, the PRSUs are being charged to expense using graded vesting over a maximum of five years. The fair value of each PRSU award was estimated on their grant dates using a Monte Carlo simulation with a range of $47.70 to $65.28 per PRSU. Expected volatilities were based on historical volatilities and range from 59.63% to 62.18%. A risk-free rate of interest with a range of 1.44% to 1.51% was utilized, which is equivalent to the yield, as of the measurement date, of the zero-coupon U.S. Treasury bill commensurate with the longest remaining performance measurement period for each tranche. We assumed no payment of dividends during the performance periods. Other Benefit Plans We maintain the Penn Virginia Corporation and Affiliated Companies Employees 401(k) Plan (the “401(k) Plan”), a defined contribution plan, which covers substantially all of our employees. We recognized $0.1 million and $0.4 million of expense attributable to the 401(k) Plan for the three and nine months ended September 30, 2018, respectively, and $0.2 million and $0.3 million for the three and nine months ended September 30, 2017, respectively. The charges for the 401(k) Plan are recorded as a component of “G&A expenses” in our Condensed Consolidated Statements of Operation. We maintain unqualified legacy defined benefit pension and defined benefit postretirement plans that cover a limited number of former employees, all of whom retired prior to 2000. The combined expense recognized with respect to these plans was less than $0.1 million for each of the three and nine months ended September 30, 2018 and 2017. The charges for these plans are recorded as a component of “Other income (expense)” in our Condensed Consolidated Statements of Operation.

Share-Based Compensation and Other Benefit Plans

Share-Based Compensation

We recognize share-based compensation expense related to our share-based compensation plans as a component of G&A expenses in our Condensed Consolidated Statements of Operations.

We reserved 749,600 shares of common stock for issuance under the Penn Virginia Corporation Management Incentive Plan for future share-based compensation awards. A total of 347,440 RSUs and 98,526 PRSUs have been granted to employees and directors as of September 30, 2018.

We recognized $1.0 million and $1.0 million and $3.5 million and $2.7 million of expense attributable to the RSUs and PRSUs for the three and nine months ended September 30, 2018 and 2017, respectively. Approximately $0.6 million of the expense for the nine months ended September 30, 2018 was attributable to the accelerated vesting of certain awards of our former Executive Chairman.

In the nine months ended September 30, 2018 and 2017, we granted 42,459 and 190,891 RSUs to certain employees and a new member of the board of directors with an average grant-date fair value of $65.96 and $48.70 per RSU, respectively. The RSUs are being charged to expense on a straight-line basis over a range of four to five years. In the nine months ended September 30, 2018, 53,411 shares vested, net of shares withheld for income taxes.

In the nine months ended September 30, 2017, we granted 98,526 PRSUs to members of our management. No PRSUs were granted during the nine months ended September 30, 2018. In the nine months ended September 30, 2018, 1,495 shares vested, net of shares withheld for income taxes. The PRSUs were issued collectively in two to three separate tranches with individual three-year performance periods beginning in January 2017, 2018 and 2019, respectively. Vesting of the PRSUs can range from zero to 200 percent of the original grant based on the performance of our common stock relative to an industry index. Due to their market condition, the PRSUs are being charged to expense using graded vesting over a maximum of five years. The fair value of each PRSU award was estimated on their grant dates using a Monte Carlo simulation with a range of $47.70 to $65.28 per PRSU. Expected volatilities were based on historical volatilities and range from 59.63% to 62.18%. A risk-free rate of interest with a range of 1.44% to 1.51% was utilized, which is equivalent to the yield, as of the measurement date, of the zero-coupon U.S. Treasury bill commensurate with the longest remaining performance measurement period for each tranche. We assumed no payment of dividends during the performance periods.

Other Benefit Plans

We maintain the Penn Virginia Corporation and Affiliated Companies Employees 401(k) Plan (the “401(k) Plan”), a defined contribution plan, which covers substantially all of our employees. We recognized $0.1 million and $0.4 million of expense attributable to the 401(k) Plan for the three and nine months ended September 30, 2018, respectively, and $0.2 million and $0.3 million for the three and nine months ended September 30, 2017, respectively. The charges for the 401(k) Plan are recorded as a component of “G&A expenses” in our Condensed Consolidated Statements of Operation.

We maintain unqualified legacy defined benefit pension and defined benefit postretirement plans that cover a limited number of former employees, all of whom retired prior to 2000. The combined expense recognized with respect to these plans was less than $0.1 million for each of the three and nine months ended September 30, 2018 and 2017. The charges for these plans are recorded as a component of “Other income (expense)” in our Condensed Consolidated Statements of Operation.