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Performance Units | 3 Months Ended
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Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Performance Units | Performance Units The Company periodically grants performance units to certain members of senior management under the Company’s existing long-term incentive plan which vest over a performance period of approximately three years. The value, and ultimate payout, of the performance units is determined based upon the Company’s total shareholder return relative to that of a predetermined peer group over a specific performance period. If performance exceeds the minimum thresholds, payout percentages could range from 50% to 200% of specified target values. If minimum target thresholds are not met, the payout is reduced to zero. The performance units are valued for accounting purposes using a Monte Carlo simulation based on certain assumptions, including (i) a volatility assumption based on the historical realized price volatility of the Company’s common stock and the common stock of the predetermined peer group for each grant year and (ii) a risk-free interest rate based on the U.S. Treasury bond yields for a term commensurate with the approximate remaining vesting period for each grant. As of March 31, 2014 and December 31, 2013, the Company’s liability associated with performance units totaled $2.5 million and $1.8 million, respectively. The liability represents the fair value of the portion of performance units for which requisite service has been completed. The following table presents a summary of the fair value of the performance units and the related assumptions for all outstanding units as of March 31, 2014.
Expected price volatility range | 24.9 | % | - | 71.7%
Weighted-average risk-free interest rate |  |  | 0.6%
Weighted-average fair value per unit |  |  | $87.35

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