EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
EARNINGS PER SHARE ("EPS") [Abstract]
Net income per the Consolidated Statements of Income	$ 11,208	$ 11,529	$ 61,245	$ 23,307
Less: Dividends paid and earnings allocated to participating securities	(24)	(33)	(55)	(73)
Income attributable to common stock	$ 11,184	$ 11,496	$ 61,190	$ 23,234
Weighted average common shares outstanding, including participating securities (in shares)	36,946,082	36,412,733	36,874,535	36,344,359
Less: weighted average participating securities (in shares)	(192,525)	(245,046)	(202,885)	(266,424)
Weighted average shares outstanding (in shares)	36,753,557	36,167,687	36,671,650	36,077,935
Basic EPS (in dollars per share)	$ 0.30	$ 0.32	$ 1.67	$ 0.65
Income attributable to common stock	$ 11,184	$ 11,496	$ 61,190	$ 23,234
Weighted average common shares outstanding (in shares)	36,753,557	36,167,687	36,671,650	36,077,935
Weighted average common equivalent shares outstanding (in shares)	65,028	91,690	69,420	80,886
Weighted average common and equivalent shares outstanding (in shares)	36,818,585	36,259,377	36,741,070	36,158,821
Diluted EPS (in dollars per share)	$ 0.30	$ 0.32	$ 1.67	$ 0.64
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)	80,000	126,453	80,000	136,292