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Share-Based Compensation (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2012
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Stock Appreciation Rights (SARs) [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||||||||||||||||||||||||
| Weighted average assumptions used to estimate fair value |
The Company estimated the fair value of each grant on the date of grant using the Black-Scholes-Merton pricing model, utilizing the following weighted average assumptions for 2012 and 2011:
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Performance Awards [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||||||||||||||||||||||||
| Weighted average assumptions used to estimate fair value |
The grant date fair value of the performance awards was $26.81, which was estimated using the Monte Carlo valuation model, and incorporated the following assumptions:
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