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EARNINGS PER SHARE - Reconciliation of weighted average shares outstanding (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
EARNINGS PER SHARE
Net income available for stockholders:	$ 7,161	$ 4,564	$ 23,760	$ 15,944
Less: Adjustments for earnings attributable to participating securities	(194)	(136)	(658)	(498)
Net income used in calculating earnings per share	$ 6,967	$ 4,428	$ 23,102	$ 15,446
Weighted average shares outstanding (including participating securities)	34,539	34,829	34,563	34,898
Adjustment for participating securities	(950)	(1,056)	(979)	(1,101)
Shares used in calculating basic and diluted earnings per share	33,589	33,773	33,584	33,797

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Weighted number of shares including participating securities.

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The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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