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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 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 six months ended June 30, 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 |  |  | 139,535 |  |  | 36.18 |
Performance condition adjustment | 27,438 |  |  | 30.32 |  |  | — |  |  | — |
Vested | (69,066 | ) |  | 30.25 |  |  | (19,855 | ) |  | 30.41 |
Forfeited | (8,839 | ) |  | 32.64 |  |  | (7,074 | ) |  | 33.81 |
Outstanding, June 30, 2015 | 182,417 |  |  | $ | 33.55 |  |  | 177,470 |  |  | $ | 34.83 |
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 June 30 |  | Six Months Ended June 30
| 2015 |  | 2014 |  | 2015 |  | 2014
| (thousands)
PSUs | $ | 720 |  |  | $ | 683 |  |  | $ | 1,214 |  |  | $ | 1,050 |
RSUs | 841 |  |  | 602 |  |  | 1,403 |  |  | 884 |
Stock options | 132 |  |  | 183 |  |  | 281 |  |  | 376 |
Total | $ | 1,693 |  |  | $ | 1,468 |  |  | $ | 2,898 |  |  | $ | 2,310 |

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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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