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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2015
Stock-based Compensation [Abstract] |
Schedule of Nonvested Share Activity [Table Text Block] | The following table summarizes the Restricted Stock Award and Performance Unit Award activity for the period ended March 31, 2015:
|  | Restricted | Performance |  | Weighted Average
|  | Stock | Stock |  | Grant Date
|  | Units | Units |  | Fair Value
Outstanding at December 31, 2014 |  | 108,237 | 71,990 | $ | 36.25
Granted |  | 13,706 | 41,114 |  | 44.64
Vested |  | (24,839) | (23,877) |  | 30.27
Adjustment for incentive awards expected to vest |  | - | 3,844 |  | 47.71
Canceled |  | (1,000) | - |  | 38.44
Outstanding at March 31, 2015 |  | 96,104 | 93,071 | $ | 40.44

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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