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STOCKHOLDERS' EQUITY - Assumptions Used in Fair Value Determination (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock Options |  |  |
Weighted Average Assumptions [Abstract] |  |  |
Expected Volatility | 26.90% | 24.00% | 26.80%
Expected Term (in years) | 3 years 10 months 24 days | 4 years | 4 years 4 months 24 days
Risk-Free Interest Rate | 1.30% | 2.50% | 2.60%
Dividend Yield | 0.50% | 0.60% | 0.60%
Vesting period | 3 years |  |
Performance Shares | Employee |  |  |
Weighted Average Assumptions [Abstract] |  |  |
Expected Volatility | 24.00% | 24.00% | 27.00%
Risk-Free Interest Rate | 1.40% | 2.50% | 2.40%
Dividend Yield | 0.50% | 0.50% | 0.50%
Initial total shareholder return percentage | 10.90% | (5.90%) | (10.50%)
Cliff vesting percentage | 100.00% |  |
Vesting period | 3 years |  |
Restricted Stock | Employee | Minimum |  |  |
Weighted Average Assumptions [Abstract] |  |  |
Vesting period | 3 years |  |
Restricted Stock | Employee | Maximum |  |  |
Weighted Average Assumptions [Abstract] |  |  |
Vesting period | 4 years |  |
Restricted Stock | Non-employee Director | Minimum |  |  |
Weighted Average Assumptions [Abstract] |  |  |
Vesting period | 3 years |  |
Restricted Stock | Non-employee Director | Maximum |  |  |
Weighted Average Assumptions [Abstract] |  |  |
Vesting period | 4 years |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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