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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2012
Stock Appreciation Rights (SARs) [Member] |
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:
| 2012 |  | 2011
Risk-free interest rate | 1.1 | % |  | 2.8 | %
Dividend yield | 0.2 | % |  | 0.2 | %
Volatility factor | 58.3 | % |  | 52.3 | %
Weighted average expected life | 5.2 – 6.7 years |  |  | 5.2 – 6.7 years |
Performance Awards [Member] |
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:
| 2012
Risk-free interest rate | 0.4 | %
Dividend yield | 0.2 | %
Volatility factor | 67.9 | %
Expected life of award | 2.9 years |

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- Definition Schedule of Share-based Payment Award, Equity Instruments Other than Options, Valuation Assumptions [Table Text Block] + References No definition available. + Details
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