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Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Share-Based Compensation Expense | The following table summarizes share-based compensation expense:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
(in thousands) |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Performance unit incentive plan (“PUP”) |  | $ | 1,607 |  |  | $ | 3,941 |  |  | $ | 3,125 |  |  | $ | 7,184 |
Restricted stock |  |  | 609 |  |  |  | 672 |  |  |  | 1,779 |  |  |  | 2,069 |
Restricted stock units |  |  | 78 |  |  |  | 124 |  |  |  | 152 |  |  |  | 231 |
Share-based compensation before income tax benefit |  |  | 2,294 |  |  |  | 4,737 |  |  |  | 5,056 |  |  |  | 9,484 |
Income tax benefit |  |  | (580 | ) |  |  | (1,752 | ) |  |  | (1,276 | ) |  |  | (3,524 | )
Share-based compensation, net of income tax benefit |  | $ | 1,714 |  |  | $ | 2,985 |  |  | $ | 3,780 |  |  | $ | 5,960 |
Summary of Activity of the Outstanding Share-Based Compensation Awards | The following table summarizes the activity of the outstanding share-based compensation awards:
|  | PUP Awards |  |  | Restricted Stock |  |  | Restricted Stock Units |
|  | Shares |  |  | Weighted-Average Grant Date Fair Value |  |  | Shares |  |  | Weighted-Average Grant Date Fair Value |  |  | Shares |  |  | Weighted-Average Grant Date Fair Value |
Balance at December 31, 2017 |  |  | 239,338 |  |  | $ | 32.80 |  |  |  | 206,899 |  |  | $ | 33.16 |  |  |  | 12,750 |  |  | $ | 30.94 |
Granted |  |  | 76,925 |  |  | $ | 52.03 |  |  |  | 49,608 |  |  | $ | 52.34 |  |  |  | 3,898 |  |  | $ | 52.54 |
Vested |  |  | (75,761 | ) |  | $ | 27.29 |  |  |  | (72,934 | ) |  | $ | 27.41 |  |  |  | (4,300 | ) |  | $ | 27.35 |
Forfeited |  |  | (693 | ) |  | $ | 51.22 |  |  |  | (6,500 | ) |  | $ | 39.95 |  |  |  | (258 | ) |  | $ | 37.69 |
Balance at September 30, 2018 |  |  | 239,809 |  |  | $ | 40.65 |  |  |  | 177,073 |  |  | $ | 40.66 |  |  |  | 12,090 |  |  | $ | 39.04 |
Summary of Stock Option Activity | Stock Options The following table summarizes stock option activity:
|  | Shares |  |  | Weighted-Average Exercise Price |
Options outstanding and exercisable at December 31, 2017 |  |  | 63,773 |  |  | $ | 16.62 |
Exercised |  |  | (5,084 | ) |  | $ | 16.62 |
Options outstanding and exercisable at September 30, 2018 |  |  | 58,689 |  |  | $ | 16.62 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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