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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Components of the stock-based compensation programs recorded as expense | The following table summarizes the components of the Company’s stock-based compensation programs recorded as expense ($ in thousands):
Years ended December 31, | 2017 |  | 2016 |  | 2015
Time lapse restricted stock: |  |  |  |  |  |  |  |
Pre-tax compensation expense | $ | 12,399 |  |  | $ | 12,415 |  |  | $ | 12,110 |
Tax benefit | (4,799 | ) |  | (4,805 | ) |  | (4,687 | )
Restricted stock expense, net of tax | $ | 7,600 |  |  | $ | 7,610 |  |  | $ | 7,423 |
Summarized information on unvested restricted stock units outstanding | The following table summarizes information on unvested restricted stock units outstanding as of December 31, 2017, 2016 and 2015:
| Number of Shares (in thousands) |  | Weighted-Average Grant-Date Fair Value
Unvested Restricted Stock Grants |  |  |  |  |
Unvested as of December 31, 2014 | 3,100 |  |  | $ | 14.45 |
Forfeited | (85 | ) |  | 15.71 |
Vested | (946 | ) |  | 12.04 |
Granted | 682 |  |  | 22.43 |
Unvested as of December 31, 2015 | 2,751 |  |  | 17.21 |
Forfeited | (114 | ) |  | 19.54 |
Vested | (879 | ) |  | 14.49 |
Granted | 503 |  |  | 26.45 |
Unvested as of December 31, 2016 | 2,261 |  |  | 20.21 |
Forfeited | (34 | ) |  | 22.38 |
Vested | (679 | ) |  | 17.21 |
Granted | 469 |  |  | 34.46 |
Unvested as of December 31, 2017 | 2,017 |  |  | $ | 24.50 |

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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 Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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