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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2016
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 | The table below presents the amounts included in net income related to share-based compensation expense for the three months ended March 31, 2016 and 2015:
|  | Three Months Ended
|  | March 31,
|  | 2016 |  | 2015
(in thousands) |  |  |  |
Awards to non-employee directors |  | $ | 165 |  |  | $ | 150 |
Awards to key employees |  | 484 |  |  | 387 |
Total compensation expense |  | 649 |  |  | 537 |
Less: tax benefit |  | (261 | ) |  | (217 | )
Share-based compensation amounts included in net income |  | $ | 388 |  |  | $ | 320 |
Award to key employees [Member] |
Shares awarded to non-employee directors [Line Items] |
Schedule of Share-based Compensation, Activity | The table below presents the summary of the stock activity for awards to key employees for the three months ended March 31, 2016:
|  | Number of Shares |  | Weighted Average Fair Value
Outstanding— December 31, 2015 |  | 110,398 |  |  | $ | 38.34 |
Granted |  | 46,571 |  |  | $ | 61.50 |
Vested |  | (39,553 | ) |  | $ | 31.79 |
Expired |  | (2,325 | ) |  | $ | 42.25 |
Outstanding— March 31, 2016 |  | 115,091 |  |  | $ | 49.26 |

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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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