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Stock Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Summary of stock compensation expense and related net tax benefit | The following table presents a summary of the total compensation costs and the related net tax benefits associated with the Company’s various share-based compensation plans for the three and nine months ended September 30, 2019 and 2018:
($ in thousands) |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Stock compensation costs |  | $ | 7,487 |  |  | $ | 10,986 |  |  | $ | 23,012 |  |  | $ | 24,201 |
Related net tax benefits for stock compensation plans |  | $ | 15 |  |  | $ | 187 |  |  | $ | 4,723 |  |  | $ | 5,062 |
Summary of activity for time-based and performance-based restricted stock units | The following table presents a summary of the activities and share price information for the Company’s time-based and performance-based RSUs that will be settled in shares for the nine months ended September 30, 2019. The number of outstanding performance-based RSUs stated below assumes the associated performance targets will be met at the target level:
|  | Time-Based RSUs |  | Performance-Based RSUs
| Shares |  | Weighted-Average Grant Date Fair Value |  | Shares |  | Weighted-Average Grant Date Fair Value
Outstanding, January 1, 2019 |  | 1,121,391 |  |  | $ | 51.22 |  |  | 411,290 |  |  | $ | 49.93 |
Granted |  | 495,191 |  |  | 52.53 |  |  | 134,600 |  |  | 54.64 |
Vested |  | (359,242 | ) |  | 31.62 |  |  | (159,407 | ) |  | 29.18 |
Forfeited |  | (68,511 | ) |  | 57.20 |  |  | — |  |  | — |
Outstanding, September 30, 2019 |  | 1,188,829 |  |  | $ | 57.34 |  |  | 386,483 |  |  | $ | 60.13 |
The following table presents a summary of the activities for the Company’s time-based RSUs that will be settled in cash for the nine months ended September 30, 2019:
|  | Shares
Outstanding, January 1, 2019 |  | — |
Granted |  | 12,145 |
Vested |  | — |
Forfeited |  | (360 | )
Outstanding, September 30, 2019 |  | 11,785 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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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