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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2016
Share-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 June 30, 2016: ﻿
﻿ |  |  |  |  |
﻿ |  | Restricted | Performance |  | Weighted Average
﻿ |  | Stock | Stock |  | Grant Date
﻿ |  | Units | Units |  | Fair Value
﻿Outstanding at December 31, 2015 |  | 93,817 | 35,999 | $ | 39.66
﻿Granted |  | 43,283 | 129,844 |  | 12.59
﻿Vested |  | (43,453) | - |  | 29.30
﻿Adjustment for incentive awards not expected to vest |  | - | (93,103) |  | 24.79
﻿Canceled |  | (6,021) | (9,050) |  | 18.82
﻿Outstanding at June 30, 2016 |  | 87,626 | 63,690 | $ | 22.28
﻿

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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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- References No definition available. + Details
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