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Stock-Based Compensation | 12 Months Ended
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Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | Stock-Based Compensation Restricted stock awards. The Company has granted restricted stock awards to employees and directors under its 2010 Long-Term Incentive Plan, the majority of which vest over a three-year period. The maximum number of shares available for grant under the 2010 Long-Term Incentive Plan is 7,200,000. The fair value of restricted stock grants is based on the value of the Company’s common stock on the date of grant. Compensation expense is recognized ratably over the requisite service period. Beginning January 1, 2013, the Company assumed annual forfeiture rates by employee group ranging from 0% to 11% based on the Company’s forfeiture history for this type of award as adjusted for management’s expectations of forfeitures. The following table summarizes information related to restricted stock held by the Company’s employees and directors for the periods presented:
| Shares |  | Weighted Average Grant Date Fair Value per Share
Non-vested shares outstanding December 31, 2011 | 391,278 |  |  | $ | 25.40 |
Granted | 753,285 |  |  | 29.66 |
Vested | (396,073 | ) |  | 26.04 |
Forfeited | (48,066 | ) |  | 31.15 |
Non-vested shares outstanding December 31, 2012 | 700,424 |  |  | 29.22 |
Granted | 594,895 |  |  | 38.64 |
Vested | (160,219 | ) |  | 27.66 |
Forfeited | (144,628 | ) |  | 28.99 |
Non-vested shares outstanding December 31, 2013 | 990,472 |  |  | $ | 28.20 |
Stock-based compensation expense recorded for restricted stock awards was approximately $10.2 million for each of the years ended December 31, 2013 and 2012 and $3.7 million for the year ended December 31, 2011, and is included in general and administrative expenses on the Company’s Consolidated Statement of Operations. Unrecognized expense as of December 31, 2013 for all outstanding restricted stock awards was $24.8 million and will be recognized over a weighted average period of 2.0 years. The fair value of awards vested for the year ended December 31, 2013 was $6.5 million. Performance share units. The Company has granted performance share units (“PSUs”) to officers of the Company under its 2010 Long-Term Incentive Plan. The PSUs are awards of restricted stock units, and each PSU that is earned represents the right to receive one share of the Company’s common stock. Each grant of PSUs is subject to a designated three-year initial performance period. The number of PSUs to be earned is subject to a market condition, which is based on a comparison of the total shareholder return (“TSR”) achieved with respect to shares of the Company’s common stock against the TSR achieved by a defined peer group at the end of the performance period. Depending on the Company’s performance relative to the defined peer group, an award recipient will earn between 0% and 200% of the initial PSUs granted. If less than 200% of the initial PSUs granted are earned at the end of the initial performance period, then the performance period will be extended an additional year to give the recipient the opportunity to earn up to an aggregate of 200% of the initial PSUs granted. The following table summarizes information related to PSUs held by the Company’s officers for the periods presented:
| Initial Unit Awards |  | Weighted Average Grant Date Fair Value per Unit
Non-vested PSUs at December 31, 2011 | — |  |  | $ | — |
Granted | 155,220 |  |  | 26.22 |
Vested | — |  |  | — |
Forfeited | — |  |  | — |
Non-vested PSUs at December 31, 2012 | 155,220 |  |  | 26.22 |
Granted | 135,620 |  |  | 42.01 |
Vested | — |  |  | — |
Forfeited | (21,540 | ) |  | 32.89 |
Non-vested PSUs at December 31, 2013 | 269,300 |  |  | $ | 33.64 |
The Company accounted for these PSUs as equity awards pursuant to the FASB’s authoritative guidance for share-based payments. The aggregate grant date fair value of the market-based awards was determined using a Monte Carlo simulation model, which results in an expected percentage of PSUs to be earned during the performance period. The fair value of these PSUs is recognized on a straight-line basis over the performance period. As it is probable that a portion of the awards will be earned during the extended performance period, the grant date fair value will be amortized over four years. However, if 200% of the initial PSUs granted are earned at the end of the initial three-year performance period, then the remaining compensation expense will be accelerated in order to be fully recognized over three years. All compensation expense related to the PSUs will be recognized if the requisite performance period is fulfilled, even if the market condition is not achieved. The Monte Carlo simulation model uses assumptions regarding random projections and must be repeated numerous times to achieve a probabilistic assessment. The key valuation assumptions for the Monte Carlo model are the forecast period, initial value, risk-free rate, volatility and correlation coefficients. The risk-free rate is the U.S. Treasury rate on the date of grant. The initial value is the average of the volume weighted average prices for the 30 trading days prior to the start of the performance cycle for the Company and each of its peers. Volatility is the standard deviation of the average percentage in stock price over a historical two-year period for the Company and each of its peers. The correlation coefficients are measures of the strength of the linear relationship between and amongst the Company and its peers estimated based on historical stock price data. Beginning January 1, 2013, the Company assumed an annual forfeiture rate of 2.7% based on management’s expectations of forfeitures for all PSUs granted. The following assumptions were used for the Monte Carlo model to determine the grant date fair value and associated stock-based compensation expense of the PSUs granted:
| 2013 PSUs |  | 2012 PSUs
Forecast period (years) | 4.00 |  |  | 4.01 |
Risk-free rate | 0.65 | % |  | 0.46 | %
Oasis volatility | 47.48 | % |  | 51.00 | %
Based on these assumptions, the Monte Carlo simulation model resulted in an expected percentage of PSUs earned of 112% and 98% for the 2013 and 2012 grants, respectively. Stock-based compensation expense recorded for these PSUs for the years ended December 31, 2013 and 2012 was $1.8 million and $0.4 million, respectively, and is included in general and administrative expenses on the Consolidated Statement of Operations. No stock-based compensation expense was recorded for the year ended December 31, 2011 related to the PSUs as the Company had not issued PSUs prior to July 2012. Unrecognized expense as of December 31, 2013 for all outstanding PSUs was $6.8 million and will be recognized over a remaining period of 2.9 years. For the years ended December 31, 2013, 2012 and 2011, the Company had an associated tax benefit of $4.5 million, $4.0 million and $1.4 million, respectively, related to all stock-based compensation.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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