EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
EARNINGS PER SHARE [Line Items]
Common stock, shares issued	52,598,005		52,598,005		52,598,005
Basic EPS Calculation
Net income available for common stock	$ 12,737	$ 7,371	$ 97,781	$ 79,828
Weighted Average Number of Shares Outstanding, Basic	52,453,000	52,408,000	52,452,000	52,627,000
Earnings Per Share, Basic	$ 0.24	$ 0.14	$ 1.86	$ 1.52
Diluted EPS Calculation
Net income available for common stock	$ 12,737	$ 7,371	$ 97,781	$ 79,828
Effect of dilutive securities on income	$ 0	$ 0	$ 0	$ 0
Effect of dilutive securities on shares	489,000	664,000	510,000	688,000
Weighted Average Number of Shares Outstanding, Diluted	52,942,000	53,072,000	52,962,000	53,315,000
Earnings Per Share, Diluted	$ 0.24	$ 0.14	$ 1.85	$ 1.50