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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Performance Share Units | The following table summarizes PSUs held by the Company’s officers at March 31, 2013:
|  | PSUs |  |  | Weighted Average Grant Date Fair Value per Unit |
Non-vested PSUs at December 31, 2012 |  |  | 155,220 |  |  | $ | 26.22 |
Granted |  |  | 135,620 |  |  | $ | 42.01 |
Vested |  |  | — |  |  |  |  |
Forfeited |  |  | — |  |  |  |  |
Non-vested PSUs at March 31, 2013 |  |  | 290,840 |  |  | $ | 33.58 |
Summary of Assumptions | The following assumptions were used for the Monte Carlo models to determine the grant date fair value and associated stock-based compensation expense of the PSUs granted:
|  | 2013 Grants |  |  | 2012 Grants |
Forecast period (years) |  |  | 4.00 |  |  |  | 4.01 |
Risk-free rate |  |  | 0.65 | % |  |  | 0.46 | %
Oasis volatility |  |  | 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 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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