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STOCK COMPENSATION PLANS (Tables) | 9 Months Ended
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Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of stock compensation expense and related net tax benefit | The following table presents the total stock compensation expense and the related net tax benefit associated with the Company’s various employee share-based compensation plans for the three and nine months ended September 30, 2016 and 2015:
($ in thousands) |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Stock compensation costs |  | $ | 4,763 |  |  | $ | 4,050 |  |  | $ | 13,973 |  |  | $ | 11,702 |
Net tax benefit recognized in equity for stock compensation plans |  | $ | 14 |  |  | $ | 31 |  |  | $ | 1,019 |  |  | $ | 3,227 |
Summary of activity for time-based and performance-based restricted stock units | The following table presents a summary of the activity for the Company’s time-based and performance-based RSUs for the nine months ended September 30, 2016 based on the target amount of awards:
|  | Nine Months Ended September 30, 2016
| Time-Based RSUs |  | Performance-Based RSUs
| Shares |  | Weighted Average Grant-Date Fair Value |  | Shares |  | Weighted Average Grant-Date Fair Value
Outstanding at beginning of period |  | 933,312 |  |  | $ | 36.83 |  |  | 389,358 |  |  | $ | 34.21 |
Granted |  | 496,580 |  |  | 31.47 |  |  | 159,407 |  |  | 29.18 |
Vested |  | (119,867 | ) |  | 25.34 |  |  | (138,019 | ) |  | 25.25 |
Forfeited |  | (96,320 | ) |  | 35.65 |  |  | — |  |  | — |
Outstanding at end of period |  | 1,213,705 |  |  | $ | 35.86 |  |  | 410,746 |  |  | $ | 35.27 |

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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 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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