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INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
INCOME TAXES
Period of disqualification of REIT status	4 years
Capital gain distributions (as a percent)	12.00%	17.00%	27.00%
Reconciliation between cash dividends paid and dividends paid deduction
Dividends paid	$ 34,652	$ 32,393	$ 29,135
Dividend reinvestment plan	314	252	181
Dividends before adjustments	34,966	32,645	29,316
Less: Spillover dividends designated to previous year	(10,263)	(11,916)	(15,209)
Less: Spillover dividends designated to following year	(285)
Plus: Dividends designated from following year		10,263	11,916
Dividends paid deduction	$ 24,418	$ 30,992	$ 26,023
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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- 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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- Definition

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- Definition

Represents the amount of dividends designated to the following year.

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- Definition

Represents the amount of dividends designated to the previous year.

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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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- 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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