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STOCKHOLDERS' EQUITY - Stock Based Compensation (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 12, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restricted stock grants |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares awarded |  | 151,500 | 149,550 | 150,050 |  |
Number of shares forfeited |  | 1,000 |  | 12,400 |  |
Number of shares vested |  | 145,725 | 122,125 | 114,650 |  |
Number of shares outstanding |  | 706,450 | 701,675 | 674,250 | 651,250 |
Vesting period |  | 5 years |  |  |  |
Restricted stock units |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares awarded |  | 80,700 | 75,026 | 77,776 |  |
Number of shares forfeited |  |  | 51,907 | 5,250 |  |
Number of shares vested |  | 73,750 | 24,343 |  |  |
Number of shares outstanding |  | 230,752 | 223,802 | 225,026 | 152,500 |
Performance cycle |  | 3 years |  |  |  |
Accrual for dividend equivalent rights |  | $ 27,000 |  |  |  |
TSR awards |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Percentage of RSUs to vest upon achievement of specified criteria |  | 50.00% |  |  |  |
TSR awards | Awards granted in 2021 |  |  |  |  |  |
Valuation assumptions |  |  |  |  |  |
Expected life |  | 3 years |  |  |  |
Dividend rate |  | 5.91% |  |  |  |
Risk-free interest rate minimum |  | 0.03% |  |  |  |
Risk-free interest rate maximum |  | 0.35% |  |  |  |
Expected price volatility minimum |  | 26.74% |  |  |  |
Expected price volatility maximum |  | 41.53% |  |  |  |
TSR awards | Awards granted in 2020 |  |  |  |  |  |
Valuation assumptions |  |  |  |  |  |
Expected life |  |  | 3 years |  |  |
Dividend rate |  |  | 10.40% |  |  |
Risk-free interest rate minimum |  |  | 0.10% |  |  |
Risk-free interest rate maximum |  |  | 0.18% |  |  |
Expected price volatility minimum |  |  | 51.24% |  |  |
Expected price volatility maximum |  |  | 77.92% |  |  |
TSR awards | Awards granted in 2019 |  |  |  |  |  |
Valuation assumptions |  |  |  |  |  |
Expected life |  |  |  | 3 years |  |
Dividend rate |  |  |  | 6.22% |  |
Risk-free interest rate minimum |  |  |  | 1.79% |  |
Risk-free interest rate maximum |  |  |  | 2.07% |  |
Expected price volatility minimum |  |  |  | 21.37% |  |
Expected price volatility maximum |  |  |  | 23.04% |  |
ROC Awards |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares forfeited |  | 0 |  |  |  |
Number of shares vested |  | 0 |  |  |  |
Percentage of RSUs to vest upon achievement of specified criteria |  | 50.00% |  |  |  |
2019 Incentive Plan |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Maximum number of shares authorized for issuance |  | 750,000 |  |  |  |
2019 Incentive Plan | Restricted stock and RSU grants |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares awarded |  | 524,952 |  |  |  |
2019 Incentive Plan | Restricted stock grants |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares awarded |  | 294,200 |  |  |  |
Number of shares issued under the Plan | 153,575 |  |  |  |  |
Aggregate value of restricted shares issued | $ 5,183,000 |  |  |  |  |
2019 Incentive Plan | Restricted stock units |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares awarded |  | 230,752 |  |  |  |
2016 Incentive Plan |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Additional awards authorized |  | 0 |  |  |  |
2016 Incentive Plan | Restricted stock and RSU grants |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares outstanding |  | 412,250 |  |  |  |
2016 Incentive Plan | Restricted stock units | Awards granted in 2018 |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares awarded |  |  |  |  | 76,250 |
Number of shares forfeited |  |  |  | 2,500 |  |
Number of shares vested |  | 73,750 |  |  |  |
2016 Incentive Plan | Restricted stock units | Awards granted in 2017 |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares awarded |  |  |  |  |  | 76,250
Number of shares forfeited |  |  | 51,907 |  |  |
Number of shares vested |  |  | 24,343 |  |  |
Pay-for-performance program | Restricted stock units | Awards granted in 2021 | General and administrative expense |  |  |  |  |  |
Valuation assumptions |  |  |  |  |  |
Aggregate fair value of the shares granted |  | $ 1,808,000 |  |  |  |
Pay-for-performance program | Restricted stock units | Awards granted in 2020 | General and administrative expense |  |  |  |  |  |
Valuation assumptions |  |  |  |  |  |
Aggregate fair value of the shares granted |  | 962,000 |  |  |  |
Pay-for-performance program | Restricted stock units | Awards granted in 2019 | General and administrative expense |  |  |  |  |  |
Valuation assumptions |  |  |  |  |  |
Aggregate fair value of the shares granted |  | $ 1,446,000 |  |  |  |

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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 number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -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 maximum 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 No definition available. + Details
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- Definition The estimated measure of the minimum 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 No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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)(i) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 + Details
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