Share-Based Compensation (Details 1) (USD $) |
9 Months Ended |
|---|---|
Sep. 30, 2011 | |
| Incentive Plan and Independent Directors Stock Units | |
| Outstanding and nonvested at December 31, 2010, Shares | 1,160,500 |
| Granted, Shares | 24,300 |
| Vested, Shares | (453,500) |
| Forfeited, Shares | (10,800) |
| Outstanding and nonvested at September 30, 2011, Shares | 720,500 |
| Outstanding and nonvested at December 31, 2010, Weighted Average Grant Date Fair Value | $ 13.76 |
| Granted, Weighted Average Grant Date Fair Value | $ 42.55 |
| Vested, Weighted Average Grant Date Fair Value | $ 17.77 |
| Forfeited, Weighted Average Grant Date Fair Value | $ 12.18 |
| Outstanding and nonvested at September 30, 2011, Weighted Average Grant Date Fair Value | $ 12.23 |
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- Definition Share-based compensation arrangement by share-based payments award equity instruments other than options forfeited in period weighted average grant date fair value.
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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