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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Compensation Expense and Related Tax Benefits | The following table presents compensation expense and the related tax benefits for equity awards recognized in the consolidated statements of income:
| Three months ended June 30 |  | Six months ended June 30
| 2016 |  | 2015 |  | 2016 |  | 2015
| (in thousands)
Stock-based compensation expense | $ | 1,820 |  |  | $ | 1,767 |  |  | $ | 3,256 |  |  | $ | 2,838 |
Tax benefit | (642 | ) |  | (622 | ) |  | (1,075 | ) |  | (914 | )
Stock-based compensation expense, net of tax | $ | 1,178 |  |  | $ | 1,145 |  |  | $ | 2,181 |  |  | $ | 1,924 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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