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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summarizes Information Related to Restricted Stock | 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, 2013 | 990,472 |  |  | $ | 28.20 |
Granted | 985,685 |  |  | 42.55 |
Vested | (408,541 | ) |  | 33.70 |
Forfeited | (197,198 | ) |  | 38.89 |
Non-vested shares outstanding December 31, 2014 | 1,370,418 |  |  | $ | 40.03 |
Summarizes Information Related to Performance Share Units | 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, 2013 | 269,300 |  |  | $ | 33.64 |
Granted | 158,970 |  |  | 41.71 |
Vested | — |  |  | — |
Forfeited | (26,130 | ) |  | 35.86 |
Non-vested PSUs at December 31, 2014 | 402,140 |  |  | $ | 36.68 |
Summary of Assumptions | 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 during the periods presented:
| 2014 PSUs |  | 2013 PSUs |  | 2012 PSUs
Forecast period (years) | 4.00 |  |  | 4.00 |  |  | 4.01 |
Risk-free interest rate | 1.12 | % |  | 0.65 | % |  | 0.46 | %
Oasis stock price volatility | 44.49 | % |  | 47.48 | % |  | 51.00 | %

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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