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STOCK COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of stock compensation expense and related net tax benefit | The following table summarizes the total share-based compensation expense and the related net tax benefit associated with its various employee share-based compensation plans for the years ended December 31, 2015, 2014 and 2013:
($ in thousands) |  | Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Compensation expense related to RSAs and RSUs |  | $ | 16,502 |  |  | $ | 13,883 |  |  | $ | 13,531 |
Net tax benefit recognized in equity for stock compensation plans |  | $ | 3,291 |  |  | $ | 6,513 |  |  | $ | 5,522 |
Schedule of stock option grants, intrinsic value of options exercised, and total fair value of shares vested | The following table presents information related to stock options for the years ended December 31, 2015, 2014 and 2013:
($ in thousands) |  | Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Cash proceeds from options exercised |  | $ | 874 |  |  | $ | 4,937 |  |  | $ | 1,680 |
Net tax benefit recognized from options exercised |  | $ | 320 |  |  | $ | 1,398 |  |  | $ | 48 |
Total intrinsic value of options exercised |  | $ | 760 |  |  | $ | 3,546 |  |  | $ | 926 |
Total fair value of options vested |  | N/A |  |  | N/A |  |  | $ | 363 |
Schedule of share-based compensation, time-based and performance-based restricted stock awards activity | The following table presents a summary of the activity for the Company’s time-based RSAs and RSUs, and performance-based RSUs during the year ended December 31, 2015 based on the target amount of awards:
|  | 2015
| RSAs and RSUs
| Time-Based |  | Performance-Based
| Shares |  | Weighted Average Grant-Date Fair Value |  | Shares |  | Weighted Average Grant-Date Fair Value
Outstanding at beginning of year |  | 751,020 |  |  | $ | 30.61 |  |  | 400,508 |  |  | $ | 27.51 |
Granted |  | 477,417 |  |  | 40.36 |  |  | 133,295 |  |  | 41.15 |
Vested |  | (225,566 | ) |  | 23.65 |  |  | (144,445 | ) |  | 22.05 |
Forfeited |  | (69,559 | ) |  | 36.64 |  |  | — |  |  | — |
Outstanding at end of year |  | 933,312 |  |  | $ | 36.83 |  |  | 389,358 |  |  | $ | 34.21 |

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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 Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested during the year. + 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 (d)(2) -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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