XML 46 R33.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Stock-Based Compensation Plans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Non-Vested Restricted Stock Activity | The following table summarizes the non-vested restricted stock activity for the year ended December 31, 2017:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
|  |  |  |  | Grant Date |
Non-vested restricted stock | Shares |  |  | Fair Value |
Non-vested January 1, 2017 |  | 780,940 |  |  | $ | 35.48 |
Granted |  | 428,333 |  |  | $ | 43.31 |
Vested |  | (237,690) |  |  | $ | 35.60 |
Forfeited |  | (96,257) |  |  | $ | 39.10 |
Non-vested at December 31, 2017 |  | 875,326 |  |  | $ | 38.88 |
Schedule of Restricted Stock Granted | The following table summarizes the restricted stock granted during the respective years:
Restricted stock grants | 2017 |  |  | 2016 |  |  | 2015 |
Employees |  | 396,708 |  |  |  | 394,243 |  |  |  | 316,531 |
Outside directors |  | 31,625 |  |  |  | 26,125 |  |  |  | 22,000 |
Total |  | 428,333 |  |  |  | 420,368 |  |  |  | 338,531 |
Weighted average grant date fair value | $ | 43.31 |  |  | $ | 33.46 |  |  | $ | 37.60 |
Vesting period | 3-5 years |  |  | 3-5 years |  |  | 3-5 years |

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 changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock
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