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Stock Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary 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 three and six months ended June 30, 2017 and 2016:
($ in thousands) |  | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Stock compensation costs |  | $ | 4,964 |  |  | $ | 4,635 |  |  | $ | 10,115 |  |  | $ | 9,210 |
Related net tax benefit for stock compensation plans |  | $ | 49 |  |  | $ | 19 |  |  | $ | 4,463 |  |  | $ | 1,005 |
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 six months ended June 30, 2017 based on the target amount of awards:
|  | Six Months Ended June 30, 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 period |  | 1,218,714 |  |  | $ | 35.92 |  |  | 410,746 |  |  | $ | 35.27 |
Granted |  | 336,582 |  |  | 54.47 |  |  | 131,597 |  |  | 56.59 |
Vested |  | (284,479 | ) |  | 36.80 |  |  | (118,044 | ) |  | 36.85 |
Forfeited |  | (94,346 | ) |  | 39.86 |  |  | — |  |  | — |
Outstanding at end of period |  | 1,176,471 |  |  | $ | 40.70 |  |  | 424,299 |  |  | $ | 41.44 |

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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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