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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2012
Summarizes Information Related to Restricted Stock | The following table summarizes information related to restricted stock held by the Company’s employees and directors at December 31, 2012:
|  | Shares |  |  | Weighted Average Grant Date Fair Value per Share |
Non-vested shares outstanding at December 31, 2010 |  |  | 240,345 |  |  | $ | 16.16 |
Granted |  |  | 248,228 |  |  |  | 30.99 |
Vested |  |  | (92,115 | ) |  |  | 16.24 |
Forfeited |  |  | (5,180 | ) |  |  | 27.40 |
Non-vested shares outstanding at 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 at December 31, 2012 |  |  | 700,424 |  |  | $ | 29.22 |
Summarizes Information Related to Performance Share Units | The following table summarizes information related to PSUs held by the Company’s officers at December 31, 2012:
|  | 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 |
Summary of Assumptions | The following assumptions were used for the Monte Carlo model to value the stock-based compensation expense of the PSUs granted during 2012:
|  | 2012 PSUs |
Forecast period (years) |  |  | 4.01 |
Risk-free rate |  |  | 0.46 | %
Oasis volatility |  |  | 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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