CALCULATION OF WEIGHTED AVERAGE SHARES OUTSTANDING FOR EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 25,077	$ 23,851	$ 74,324	$ 62,581	$ 85,385
Basic weighted average shares outstanding	32,982,532	34,045,225	32,966,214	34,050,459
Plus unvested restricted stock	96,567	79,386	94,958	54,416
Diluted weighted shares outstanding	33,079,099	34,124,611	33,061,172	34,104,875
Earnings per common share
Basic	$ 0.76	$ 0.70	$ 2.25	$ 1.84
Diluted	$ 0.76	$ 0.70	$ 2.25	$ 1.83