EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
EARNINGS PER SHARE ("EPS") [Abstract]
Net income per the Consolidated Statements of Income	$ 14,745	$ 11,157
Less: Dividends paid and earnings allocated to participating securities	(29)	(25)
Income attributable to common stock	$ 14,716	$ 11,132
Weighted average common shares outstanding, including participating securities (in shares)	37,495,317	37,603,628
Less: weighted average participating securities (in shares)	(145,725)	(150,423)
Weighted average common shares outstanding (in shares)	37,349,592	37,453,205
Basic EPS (in dollars per share)	$ 0.39	$ 0.30
Income attributable to common stock	$ 14,716	$ 11,132
Weighted average common shares outstanding (in shares)	37,349,592	37,453,205
Weighted average common equivalent shares outstanding (in shares)	115,133	96,371
Weighted average common and equivalent shares outstanding (in shares)	37,464,725	37,549,576
Diluted EPS (in dollars per share)	$ 0.39	$ 0.30
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average shares excluded from earnings per share calculation (in shares)	0	0