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INCOME TAXES (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INCOME TAXES
Period of disqualification of REIT status	4 years
Federal excise tax expense	$ 0	$ 6,000	$ 174,000
Capital gain distributions (as a percent)	17.00%	27.00%	67.00%
Reconciliation between Cash Dividends Paid and Dividends Paid Deduction:
Dividends paid	$ 32,393,000	$ 29,135,000	$ 26,179,000
Dividend reinvestment plan	252,000	181,000	228,000
Dividends before adjustment for previous and current year	32,645,000	29,316,000	26,407,000
Less: Spillover dividends designated to previous year	(11,916,000)	(15,209,000)	(18,177,000)
Plus: Dividends designated from following year	10,263,000	11,916,000	15,209,000
Dividends paid deduction	$ 30,992,000	$ 26,023,000	$ 23,439,000
Maximum
Reconciliation between Cash Dividends Paid and Dividends Paid Deduction:
Percentage of discount on common stock purchased through the dividend reinvestment plan	5.00%

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- Definition

Cash dividends paid for reconciliation to dividends paid deduction.

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- Definition

Represents the percentage of aggregate cash distributions for dividends during the period, treated as capital gains for federal tax purposes.

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No definition available.

+ Details

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- Definition

Represents the amount of dividends paid to stockholders that are deducted from the entity's taxable income.

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- Definition

Represents the amount of discount on common stock purchased through the dividend reinvestment plan.

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- Definition

Represents the amount of dividends before adjustments for dividends designated to previous year and designated from following year.

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No definition available.

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- Definition

Represents the amount of dividends designated from the following year.

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- Definition

Represents the amount of dividends designated to the previous year.

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No definition available.

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- Definition

Represents the amount of federal excise tax expense during the period on taxable income generated.

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- Definition

Represents the percentage of discount from market price on common stock purchased through the dividend reinvestment plan.

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No definition available.

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- Definition

Represents the subsequent period during which the entity would be disqualified as a real estate investment trust, if during any tax year the entity fails to qualify as a real estate investment trust.

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No definition available.

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