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EARNINGS PER SHARE - Reconciliation of weighted average shares outstanding (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
EARNINGS PER SHARE
Net income available for stockholders:	$ 8,990	$ 6,119	$ 16,599	$ 11,380
Less: Adjustments for earnings attributable to participating securities	(246)	(203)	(465)	(368)
Net income used in calculating earnings per share	$ 8,744	$ 5,916	$ 16,134	$ 11,012
Weighted average shares outstanding (including participating securities)	34,561	34,936	34,584	34,934
Adjustment for participating securities	(953)	(1,116)	(995)	(1,151)
Shares used in calculating basic and diluted earnings per share	33,608	33,820	33,589	33,783

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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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