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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2016
Share-based Compensation [Abstract] |  |
Assumptions used for the grants | The following table illustrates the valuation assumptions used for the 2018, 2017 and 2016 grants:
| 2018 |  | 2017 |  | 2016
Expected volatility | 25% |  | 25 - 26% |  | 29 -32%
Weighted-average expected volatility | 25% |  | 26% |  | 32%
Expected dividend yield | 1.2% |  | 1.2 - 1.3% |  | 1.3 - 1.5%
Weighted-average expected dividend yield | 1.2% |  | 1.3% |  | 1.3%
Expected term, in years | 5 |  | 5 |  | 5
Risk-free interest rate | 2.6 - 2.9% |  | 1.7 - 2.0% |  | 1.1 - 1.4%
Stock option activity | The following table summarizes the activity during the year ended December 31, 2018 for stock option awards:
| Shares |  | Weighted-Average Exercise Price
Outstanding at beginning of year | 1,135,608 |  |  | $ | 47.47 |
Granted | 202,623 |  |  | 67.85 |
Exercised | (223,352 | ) |  | 26.33 |
Forfeited | (30,312 | ) |  | 66.06 |
Outstanding at end of year | 1,084,567 |  |  | $ | 55.11 |
Exercisable at end of year | 711,499 |  |  | $ | 48.94 |
Nonvested restricted share awards activity |  | The following table summarizes the activity during the year ended December 31, 2018 for nonvested restricted share awards:
| Shares |  | Weighted-Average Grant Date Fair Value
Nonvested at beginning of year | 99,789 |  |  | $ | 53.11 |
Granted | 16,377 |  |  | 67.70 |
Vested | (14,384 | ) |  | 68.00 |
Forfeited | (1,561 | ) |  | 67.39 |
Nonvested at end of year | 100,221 |  |  | $ | 53.52 |
Nonvested performance share awards activity | The following table summarizes the activity during the year ended December 31, 2018 for nonvested performance share awards:
| Shares |  | Weighted-Average Grant Date Fair Value
Nonvested at beginning of year | 123,024 |  |  | $ | 63.09 |
Granted | 47,997 |  |  | 67.84 |
Forfeited | (43,974 | ) |  | 66.23 |
Nonvested at end of year | 127,047 |  |  | $ | 63.80 |
Nonvested restricted stock units activity | The following table summarizes the activity during the year ended December 31, 2018 for nonvested restricted stock units:
| Shares |  | Weighted-Average Grant Date Fair Value
Nonvested at beginning of year | 43,125 |  |  | $ | 64.67 |
Granted | 83,380 |  |  | 66.83 |
Vested | (15,427 | ) |  | 58.27 |
Forfeited | (9,123 | ) |  | 66.60 |
Nonvested at end of year | 101,955 |  |  | $ | 67.23 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + 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 (c) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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://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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