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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Share-Based Compensation Expense | The following table summarizes share-based compensation expense:
|  | Year Ended December 31, |
(in thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Performance unit incentive plan (“PUP”) |  | $ | 8,088 |  |  | $ | 5,703 |  |  | $ | 1,692 |
Restricted stock |  |  | 2,594 |  |  |  | 2,073 |  |  |  | 2,111 |
Restricted stock units |  |  | 287 |  |  |  | 262 |  |  |  | 45 |
Share-based compensation before income tax benefit |  |  | 10,969 |  |  |  | 8,038 |  |  |  | 3,848 |
Income tax benefit |  |  | (4,079 | ) |  |  | (2,988 | ) |  |  | (1,454 | )
Share-based compensation, net of income tax benefit |  | $ | 6,890 |  |  | $ | 5,050 |  |  | $ | 2,394 |
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, 2016 |  |  | 255,505 |  |  | $ | 26.11 |  |  |  | 267,051 |  |  | $ | 25.96 |  |  |  | 15,982 |  |  | $ | 25.58 |
Granted |  |  | 73,557 |  |  | $ | 47.44 |  |  |  | 67,029 |  |  | $ | 46.99 |  |  |  | 2,950 |  |  | $ | 47.45 |
Vested |  |  | (76,082 | ) |  | $ | 24.07 |  |  |  | (112,548 | ) |  | $ | 24.04 |  |  |  | (6,182 | ) |  | $ | 24.97 |
Forfeited |  |  | (13,642 | ) |  | $ | 34.99 |  |  |  | (14,633 | ) |  | $ | 35.31 |  |  |  | — |  |  | $ | — |
Balance at December 31, 2017 |  |  | 239,338 |  |  | $ | 32.80 |  |  |  | 206,899 |  |  | $ | 33.16 |  |  |  | 12,750 |  |  | $ | 30.94 |
Summary of Additional Stock Option Information | The following table provides additional stock option information:
|  | December 31, |
(in thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Total intrinsic value of stock options outstanding(1) |  | $ | 2,473 |  |  | $ | 1,753 |  |  | $ | 740 |
Total intrinsic value of stock options exercised |  | $ | — |  |  | $ | — |  |  | $ | 1,474 |
Cash received from the exercise of stock options |  | $ | — |  |  | $ | — |  |  | $ | 898 |
Tax benefits realized for tax deductions related to stock option exercises |  | $ | — |  |  | $ | — |  |  | $ | 104 |
(1) | The intrinsic value of stock options outstanding represents the difference between our closing stock price on December 31 of each year and the exercise price, multiplied by the number of in-the-money stock options.

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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=96867065&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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