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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Stock Options Plan [Member] |
Assumptions Used to Determine Grant-Date Fair Value of Options | The following weighted average assumptions were used to determine the grant-date fair value of options:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Dividend yield |  |  | 1.11 | % |  |  | 0.96 | % |  |  | 1.38 | %
Expected life |  |  | 5 years |  |  |  | 5 years |  |  |  | 5 years |
Volatility |  |  | 25.6 | % |  |  | 25.3 | % |  |  | 25.1 | %
Risk free interest rate |  |  | 2.74 | % |  |  | 1.50 | % |  |  | 0.91 | %
Summary of Transactions of Company's Stock Option Plans | The following table summarizes the transactions of the Company’s stock option plans for the year ended December 31, 2018:
|  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Grant-Date Fair Value |
Outstanding at December 31, 2017 |  |  | 357,666 |  |  | $ | 13.74 |  |  | $ | 35.69 |
Granted – at discount |  |  | 287,966 |  |  | $ | 45.21 |  |  | $ | 34.98 |
– at market value |  |  | 18,850 |  |  | $ | 68.20 |  |  | $ | 16.23 |
Exercised |  |  | (103,562 | ) |  | $ | 11.00 |  |  | $ | 29.78 |
Forfeited |  |  | (15,671 | ) |  | $ | 24.35 |  |  | $ | 25.38 |
Outstanding at December 31, 2018 |  |  | 545,249 |  |  | $ | 32.46 |  |  | $ | 36.06 |
Stock Equivalent Units [Member] |
Assumptions Used to Determine Fair Value of SEUs | The following assumptions were used to determine the fair value of SEUs at the balance sheet dates:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Dividend yield |  |  | 1.44 | % |  |  | 1.09 | % |  |  | 0.98 | %
Volatility |  |  | 27.2 | % |  |  | 25.4 | % |  |  | 25.2 | %
Risk free interest rate |  |  | 2.46 | % |  |  | 1.98 | % |  |  | 1.47 | %
Summarizes Transactions of SEUs | The following table summarizes the transactions of the Company’s SEUs for the year ended December 31, 2018:
|  | Number of SEUs |  |  | Weighted Average Exercise Price |  |  | Weighted Average Grant-Date Fair Value |
Outstanding at December 31, 2017 |  |  | 400,342 |  |  | $ | 3.10 |  |  | $ | 46.65 |
Granted – at discount |  |  | 115,229 |  |  | $ | 2.36 |  |  | $ | 57.16 |
– at market value |  |  | 5,658 |  |  | $ | 68.20 |  |  | $ | 16.23 |
Exercised |  |  | (78,239 | ) |  | $ | 5.40 |  |  | $ | 30.44 |
Forfeited |  |  | (24,054 | ) |  | $ | 0.96 |  |  | $ | 41.58 |
Outstanding at December 31, 2018 |  |  | 418,936 |  |  | $ | 3.47 |  |  | $ | 52.45 |

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- 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://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 2: 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 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 (d) -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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