XML 56 R35.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Stock-Based Compensation (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Restricted Stock Unit and Performance Share Transactions | A summary of restricted stock unit and performance share transactions for the year ended December 31, 2017, is shown below:
| Restricted Stock Units | Weighted Average Grant Date Fair Value | Performance Shares | Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2016 | 623,142 |  | $92.54 | 1,455,054 |  | $94.19
Granted | 153,675 |  | $142.14 | 389,384 |  | $132.94
Distributed (vested) | (194,373 | ) |  | (571,254 | ) |
Cancelled | (10,231 | ) |  | (73,614 | ) |
Outstanding as of December 31, 2017 (1) | 572,213 |  | $109.31 | 1,199,570 |  | $115.33
Vested or expected to vest as of December 31, 2017 | 572,213 |  |  | 1,150,611 |  |
(1) | Outstanding performance shares are reflected at the maximum possible payout that may be earned during the relevant performance periods.

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 for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration