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SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2020
Summary of Stock Option Activity | The following is a summary of stock option activity under the 2014 Plan as of and for the year ended December 31, 2020:
|  | Options |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value |
Options outstanding at December 31, 2019 |  |  | 584,675 |  |  | $ | 159.34 |  |  |  |  |  |  |  |  |
Granted |  |  | 161,500 |  |  |  | 207.60 |  |  |  |  |  |  |  |  |
Exercised |  |  | (135,809 | ) |  |  | 146.90 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (25,250 | ) |  |  | 175.76 |  |  |  |  |  |  |  |  |
Options outstanding at December 31, 2020 |  |  | 585,116 |  |  | $ | 174.83 |  |  |  | 3.22 |  |  | $ | 30,729 |
Options exercisable at December 31, 2020 |  |  | 89,697 |  |  | $ | 161.15 |  |  |  | 2.27 |  |  | $ | 5,866 |
Summary of Non-Vested Restricted Stock Activity | The following is a summary of non-vested restricted stock activity as of and for the year ended December 31, 2020:
|  | Shares |  |  | Weighted- Average Grant Date Fair Value |
Non-vested restricted stock outstanding at December 31, 2019 |  |  | 3,191,705 |  |  | $ | 68.63 |
Granted |  |  | 184,265 |  |  |  | 193.89 |
Vested |  |  | (37,274 | ) |  |  | 108.36 |
Forfeited |  |  | (3,589 | ) |  |  | 164.94 |
Non-vested restricted stock outstanding at December 31, 2020 |  |  | 3,335,107 |  |  | $ | 75.00 |
Valuation Assumptions Used for Stock Option Awards | The following table presents the weighted-average assumptions used for stock options granted :
Years Ended December 31, |  | 2020 |  |  | 2019 |  |  | 2018 |
Expected term in years |  |  | 4.25 |  |  |  | 4.25 |  |  |  | 4.25 |
Risk-free interest rate |  |  | 0.26 | % |  |  | 1.64 | % |  |  | 2.69 | %
Expected volatility |  |  | 20.89 | % |  |  | 18.01 | % |  |  | 17.11 | %
Expected dividend yield |  |  | 3.69 | % |  |  | 3.99 | % |  |  | 3.13 | %
Grant date fair value |  | $ | 20.76 |  |  | $ | 14.81 |  |  | $ | 20.05 |
Share-Based Compensation Expense | The following table provides information on share-based compensation expense:
Years Ended December 31, |  | 2020 |  |  | 2019 |  |  | 2018 |
Stock options |  | $ | 2,447 |  |  | $ | 2,440 |  |  | $ | 2,014 |
Non-vested restricted stock |  |  | 19,682 |  |  |  | 14,592 |  |  |  | 13,494 |
Share-based compensation expense |  | $ | 22,129 |  |  | $ | 17,032 |  |  | $ | 15,508 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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