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STOCKHOLDERS' EQUITY - Stock Based Compensation Plans (Details) - USD ($)		1 Months Ended	12 Months Ended
	Jan. 17, 2020	Jun. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2010	Dec. 31, 2016
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%
Awards granted in 2018
Valuation assumptions
Expected life				3 years
Dividend rate				6.82%
Risk-free interest rate minimum				2.18%
Risk-free interest rate maximum				2.70%
Expected price volatility minimum				22.29%
Expected price volatility maximum				25.99%
Awards granted in 2017
Valuation assumptions
Expected life					3 years
Dividend rate					7.16%
Risk-free interest rate minimum					1.14%
Risk-free interest rate maximum					1.64%
Expected price volatility minimum					16.57%
Expected price volatility maximum					19.16%
Restricted stock
Stock Based Compensation
Number of shares awarded			150,050	144,750	140,100
Number of shares forfeited			12,400	400	500
Number of shares vested			114,650	106,000	118,450
Number of shares outstanding			674,250	651,250	612,900		591,750
Vesting period			5 years
RSUs
Stock Based Compensation
Number of shares awarded			77,776	76,250	76,250
Number of shares forfeited			5,250		86,416
Number of shares vested					113,584
Number of shares outstanding			225,026	152,500	76,250		200,000
TSR awards
Stock Based Compensation
Percentage of RSUs to vest upon achievement of specified criteria				50.00%
ROC Awards
Stock Based Compensation
Percentage of RSUs to vest upon achievement of specified criteria				50.00%
2016 and 2012 Incentive Plans
Stock Based Compensation
Additional awards authorized			0
2016 and 2012 Incentive Plans | Restricted stock and RSU grants
Stock Based Compensation
Number of shares outstanding			824,250
2016 and 2012 Incentive Plans | Restricted stock
Stock Based Compensation
Number of shares outstanding			674,250
2016 and 2012 Incentive Plans | RSUs
Stock Based Compensation
Number of shares outstanding			150,000
2019 Incentive Plan
Stock Based Compensation
Maximum number of shares authorized for issuance			750,000
Aggregate value of restricted shares issued	$ 4,202,000
2019 Incentive Plan | Restricted stock
Stock Based Compensation
Number of shares issued under the Plan	149,550
2019 Incentive Plan | RSUs
Stock Based Compensation
Number of shares awarded			75,026
2009 Incentive Plan | RSUs
Stock Based Compensation
Number of shares awarded						200,000
Number of shares forfeited					86,416
Number of shares vested		113,584			113,584
Pay-for-performance program | RSUs | Awards granted in 2019 | General and administrative expense
Valuation assumptions
Aggregate fair value of the shares granted			$ 865,000
Pay-for-performance program | RSUs | Awards granted in 2018 | General and administrative expense
Valuation assumptions
Aggregate fair value of the shares granted			818,000
Pay-for-performance program | RSUs | Awards granted in 2017 | General and administrative expense
Valuation assumptions
Aggregate fair value of the shares granted			$ 811,000

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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 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.

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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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