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Stock Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Assumptions Used To Value Share-Based Compensation | The assumptions used in the Black-Scholes single option pricing model are as follows.
| Year Ended December 31
| 2018 |  | 2017 |  | 2016
Dividend yield | 3% |  | 3% |  | 3%
Risk-free interest rate | 2% |  | 2% |  | 1%
Stock volatility | 23% |  | 25% |  | 25%
Average expected life (years) | 6 |  | 6 |  | 6
Summary Of Option Activity During The Period | A summary of option activity during 2018 is presented below:
| Shares |  | Weighted-Average Exercise Price
| (In thousands, except per share amounts)
Shares under option at December 31, 2017 | 11,026 |  |  | $33.23
Granted(1) | — |  |  | 40.50 |
Exercised | (1,954 | ) |  | 28.15
Forfeited or expired | (11 | ) |  | 27.06
Shares under option at December 31, 2018 | 9,061 |  |  | $34.33
Exercisable at December 31, 2018 | 6,736 |  |  | $33.07
Summary Of Restricted Stock Awards And PSUs Activity During The Period | A summary of Restricted Stock Awards and PSUs activity during 2018 is presented below:
| Restricted Stock Awards and PSUs |  | Weighted Average Grant-Date Fair Value
| (In thousands, except per share amounts)
Non-vested at December 31, 2017 | 5,367 |  |  | $41.60
Granted | 2,518 |  |  | 42.72
Vested | (1,575 | ) |  | 46.69
Forfeited | (185 | ) |  | 40.42
Non-vested at December 31, 2018 | 6,125 |  |  | $40.82

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- Definition Tabular disclosure for stock option 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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