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Stock-Based Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Stock Options Plan [Member] |
Summary of Transactions of Company's Stock Option Plans | The following table summarizes the transactions of the Company’s stock option plans for the six months ended June 30, 2019:
|  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Grant-Date Fair Value |
Outstanding at December 31, 2018 |  |  | 545,249 |  |  | $ | 32.46 |  |  | $ | 36.06 |
Granted - at discount |  |  | 67,230 |  |  | $ | 0.00 |  |  | $ | 71.54 |
- at market value |  |  | 12,632 |  |  | $ | 81.07 |  |  | $ | 22.69 |
Exercised |  |  | (79,916 | ) |  | $ | 14.67 |  |  | $ | 27.42 |
Forfeited |  |  | (9,122 | ) |  | $ | 32.39 |  |  | $ | 40.47 |
Outstanding at June 30, 2019 |  |  | 536,073 |  |  | $ | 32.13 |  |  | $ | 41.43 |
Stock Equivalent Units [Member] |
Summarizes Transactions of SEUs | The following table summarizes the transactions of the Company’s SEUs for the six months ended June 30, 2019:
|  | Number of SEUs |  |  | Weighted Average Exercise Price |  |  | Weighted Average Grant-Date Fair Value |
Outstanding at December 31, 2018 |  |  | 418,936 |  |  | $ | 3.47 |  |  | $ | 52.45 |
Granted - at discount |  |  | 121,815 |  |  | $ | 0.00 |  |  | $ | 71.36 |
- at market value |  |  | 4,359 |  |  | $ | 81.07 |  |  | $ | 22.69 |
Exercised |  |  | (129,096 | ) |  | $ | 2.44 |  |  | $ | 46.95 |
Forfeited |  |  | (1,500 | ) |  | $ | 11.57 |  |  | $ | 48.13 |
Outstanding at June 30 2019 |  |  | 414,514 |  |  | $ | 3.55 |  |  | $ | 59.42 |

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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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