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Incentive, Retirement and Deferred Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
Compensation Related Costs [Abstract] |
Performance Unit Fair Value Assumptions | The following table presents a summary of the fair value of the performance units and the related assumptions for all outstanding units as of December 31, 2014 and 2013.
| December 31,
| 2014 |  | 2013
Expected price volatility range | 26.6 | % | - | 86.6 | % |  | 27.0 | % | - | 44.8 | %
Weighted-average risk-free interest rate |  |  | 0.5 | % |  |  |  | 0.4 | %
Weighted-average fair value per unit |  |  | $ | 13.85 |  |  |  |  | $ | 97.06 |
Performance unit activity for the years ended December 31, 2014 and 2013 was as follows:
| December 31,
| 2014 |  | 2013
Outstanding at January 1 | 31,142 |  |  | — |
Granted | 47,015 |  |  | 31,142 |
Forfeited /canceled | (12,060 | ) |  | — |
Outstanding at December 31 | 66,097 |  |  | 31,142 |
Performance period ending December 31, 2015 |  |  |
Vested | 9,208 |  |  | 12,178 |
Unvested | 18,874 |  |  | 18,964 |
Performance period ending December 31, 2016 |  |  |
Vested | 12,671 |  |  | — |
Unvested | 25,344 |  |  | — |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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