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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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Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them.

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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.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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