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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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- 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=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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