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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation [Abstract] |
Assumptions used for the grants | The following table illustrates the valuation assumptions used for the 2017, 2016 and 2015 grants:
| 2017 |  | 2016 |  | 2015
Expected volatility | 25 - 26% |  | 29 - 32% |  | 32 - 36%
Weighted-average expected volatility | 26% |  | 32% |  | 36%
Expected dividend yield | 1.2 - 1.3% |  | 1.3 - 1.5% |  | 1.1 - 1.2%
Weighted-average expected dividend yield | 1.3% |  | 1.3% |  | 1.2%
Expected term, in years | 5 |  | 5 |  | 5
Risk-free interest rate | 1.7 - 2.0% |  | 1.1 - 1.4% |  | 1.4 - 1.6%
Stock option activity | The following table summarizes the activity during the year ended December 31, 2017 for stock option awards:
| Shares |  | Weighted-Average Exercise Price
Outstanding at beginning of year | 1,113,382 |  |  | $ | 42.34 |
Granted | 224,985 |  |  | 72.85 |
Exercised | (159,792 | ) |  | 44.04 |
Forfeited | (42,586 | ) |  | 63.98 |
Expired | (381 | ) |  | 65.12 |
Outstanding at end of year | 1,135,608 |  |  | $ | 47.47 |
Exercisable at end of year | 766,583 |  |  | $ | 39.15 |
Nonvested restricted share awards activity | The following table summarizes the activity during the year ended December 31, 2017 for nonvested restricted share awards:
| Shares |  | Weighted-Average Grant Date Fair Value
Nonvested at beginning of year | 117,234 |  |  | $ | 47.62 |
Granted | 20,284 |  |  | 73.06 |
Vested | (32,990 | ) |  | 44.36 |
Forfeited | (4,739 | ) |  | 63.43 |
Nonvested at end of year | 99,789 |  |  | $ | 53.11 |
Nonvested performance share awards activity | The following table summarizes the activity during the year ended December 31, 2017 for nonvested performance share awards:
| Shares |  | Weighted-Average Grant Date Fair Value
Nonvested at beginning of year | 129,096 |  |  | $ | 59.30 |
Granted | 45,792 |  |  | 72.84 |
Vested | (20,060 | ) |  | 61.80 |
Forfeited | (31,804 | ) |  | 62.55 |
Nonvested at end of year | 123,024 |  |  | $ | 63.09 |
Nonvested restricted stock units activity | The following table summarizes the activity during the year ended December 31, 2017 for nonvested restricted stock units:
| Shares |  | Weighted-Average Grant Date Fair Value
Nonvested at beginning of year | 31,038 |  |  | $ | 60.47 |
Granted | 30,750 |  |  | 68.92 |
Vested | (14,638 | ) |  | 65.74 |
Forfeited | (4,025 | ) |  | 60.82 |
Nonvested at end of year | 43,125 |  |  | $ | 64.67 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based 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
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- 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
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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://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 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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