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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2015
Shares awarded to non-employee directors [Line Items] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | The table below presents the amounts included in net income related to share-based compensation expense for the three and six months ended June 30, 2015 and 2014:
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
(in thousands) |  |  |  |  |  |  |  |
Awards to non-employee directors |  | $ | 160 |  |  | $ | 132 |  |  | $ | 311 |  |  | $ | 256 |
Awards to key employees |  | 250 |  |  | 295 |  |  | 636 |  |  | 809 |
Total compensation expense |  | 410 |  |  | 427 |  |  | 947 |  |  | 1,065 |
Less: tax benefit |  | (165 | ) |  | (172 | ) |  | (381 | ) |  | (429 | )
Share-based compensation amounts included in net income |  | $ | 245 |  |  | $ | 255 |  |  | $ | 566 |  |  | $ | 636 |
Awards to non-employee directors [Member] |
Shares awarded to non-employee directors [Line Items] |
Schedule of Share-based Compensation, Activity [Table Text Block] | A summary of the stock activity for our non-employee directors during the six months ended June 30, 2015 is presented below:
|  | Number of Shares |  | Weighted Average Fair Value
Outstanding— December 31, 2014 |  | — |  |  | $ | — |
Granted |  | 14,484 |  |  | $ | 45.54 |
Vested |  | (14,484 | ) |  | $ | 45.54 |
Outstanding— June 30, 2015 |  | — |  |  | $ | — |
Award to key employees [Member] |
Shares awarded to non-employee directors [Line Items] |
Schedule of Share-based Compensation, Activity [Table Text Block] | The table below presents the summary of the stock activity for awards to key employees for the six months ended June 30, 2015:
|  | Number of Shares |  | Weighted Average Fair Value
Outstanding— December 31, 2014 |  | 123,038 |  |  | $ | 32.60 |
Granted |  | 29,763 |  |  | $ | 48.21 |
Vested |  | (43,839 | ) |  | $ | 28.01 |
Expired |  | (2,520 | ) |  | $ | 28.83 |
Outstanding— June 30, 2015 |  | 106,442 |  |  | $ | 37.97 |

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- Definition [Line Items] for Shares awarded to non-employee directors [Table] + References No definition available. + Details
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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 share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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