XML 48 R35.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Stock Compensation Plans (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2018
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 months ended March 31, 2018 and 2017:
($ in thousands) |  | Three Months Ended March 31,
| 2018 |  | 2017
Stock compensation costs |  | $ | 6,158 |  |  | $ | 5,151 |
Related net tax benefits for stock compensation plans |  | $ | 4,778 |  |  | $ | 4,414 |
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 three months ended March 31, 2018 based on the target amount of awards:
|  | Three Months Ended March 31, 2018
| 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 |  | 1,166,580 |  |  | $ | 42.00 |  |  | 424,299 |  |  | $ | 41.44 |
Granted |  | 389,667 |  |  | 67.32 |  |  | 120,286 |  |  | 70.13 |
Vested |  | (312,413 | ) |  | 39.97 |  |  | (133,295 | ) |  | 41.15 |
Forfeited |  | (29,223 | ) |  | 44.62 |  |  | — |  |  | — |
Outstanding, at end of period |  | 1,214,611 |  |  | $ | 50.58 |  |  | 411,290 |  |  | $ | 49.93 |

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration