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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Nonvested Share Activity [Table Text Block] | The following summarizes the activity of our PSUs and RSUs awarded under the 2013 Incentive Plan for the three months ended March 31, 2015:
| PSUs |  | RSUs
| Number of shares |  | Weighted Average Grant-Date Fair Value |  | Number of shares |  | Weighted Average Grant-Date Fair Value
Outstanding, December 31, 2014 | 116,559 |  |  | $ | 29.66 |  |  | 64,864 |  |  | $ | 30.45 |
Granted | 116,325 |  |  | 36.17 |  |  | 137,614 |  |  | 36.18 |
Performance condition adjustment | 27,438 |  |  | 30.32 |  |  | — |  |  | — |
Vested | (64,149 | ) |  | 30.32 |  |  | (17,107 | ) |  | 30.43 |
Forfeited | (1,428 | ) |  | 29.79 |  |  | (1,099 | ) |  | 30.32 |
Outstanding, March 31, 2015 | 194,745 |  |  | $ | 33.42 |  |  | 184,272 |  |  | $ | 34.73 |
Stock-Based Compensation Expense Recognized [Table Text Block] | Total stock-based compensation recognized from PSUs, RSUs, and stock options net of estimated forfeitures, was as follows:
| Three Months Ended March 31
| 2015 |  | 2014
| (thousands)
PSUs | $ | 494 |  |  | $ | 367 |
RSUs | 562 |  |  | 282 |
Stock options | 149 |  |  | 193 |
Total | $ | 1,205 |  |  | $ | 842 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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