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Stock Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of stock compensation expense and related net tax benefit | The following table presents a summary of the total share-based compensation expense and the related net tax benefit associated with the Company’s various employee share-based compensation plans for the years ended December 31, 2017, 2016 and 2015:
($ in thousands) |  | Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Stock compensation costs |  | $ | 24,657 |  |  | $ | 22,102 |  |  | $ | 16,502 |
Related net tax benefits for stock compensation plans |  | $ | 4,775 |  |  | $ | 1,055 |  |  | $ | 3,291 |
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 year ended December 31, 2017 based on the target amount of awards:
|  | 2017
| Time-Based RSUs |  | Performance-Based RSUs
| Shares |  | Weighted- Average Grant Date Fair Value |  | Shares |  | Weighted- Average Grant Date Fair Value
Outstanding at beginning of year |  | 1,218,714 |  |  | $ | 35.92 |  |  | 410,746 |  |  | $ | 35.27 |
Granted |  | 411,290 |  |  | 55.28 |  |  | 131,597 |  |  | 56.59 |
Vested |  | (312,226 | ) |  | 36.55 |  |  | (118,044 | ) |  | 36.85 |
Forfeited |  | (151,198 | ) |  | 40.38 |  |  | — |  |  | — |
Outstanding at end of year |  | 1,166,580 |  |  | $ | 42.00 |  |  | 424,299 |  |  | $ | 41.44 |
Schedule of information related to stock options | The following table presents information related to stock options for the years ended December 31, 2017, 2016 and 2015:
($ in thousands) |  | Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Cash proceeds from options exercised |  | $ | — |  |  | $ | — |  |  | $ | 874 |
Net tax benefit recognized from options exercised |  | $ | — |  |  | $ | — |  |  | $ | 320 |
Total intrinsic value of options exercised |  | $ | — |  |  | $ | — |  |  | $ | 760 |

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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 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=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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