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Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2014
Supplemental Employee Incentive Plan IV |
Stock-Based Compensation arrangements |
Schedule of Value per Share and Assumptions Used |
|  | June 30, |
|  | 2014 |
Stock price volatility |  | 36.0% |
Risk free rate of return |  | 1.0% |
Annual salary increase rate |  | 4.0% |
Annual turnover rate |  | 4.6% |
TSR Performance Share Awards |
Stock-Based Compensation arrangements |
Schedule of Value per Share and Assumptions Used |
|  | Grant Date |  | June 30, 2014 |
Fair value per performance share award |  | $ | 32.04 |  | $5.94 - $21.77 |
Assumptions: |  |  |  |  |
Stock price volatility |  | 41.3% |  | 29.7% - 102.7% |
Risk free rate of return |  | 0.7% |  | 0.1% - 0.7% |
Expected dividend yield |  | 0.2% |  | 0.2% |

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