BASIS OF PRESENTATION (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share
Net income	$ 31,497	$ 23,268
Preferred dividends	0	(13)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 31,497	$ 23,255
Weighted average common shares outstanding for basic earnings per share (in shares)	34,564	30,442
Assumed incremental common shares issued upon vesting of outstanding restricted stock units (in shares)	136	203
Weighted average common shares for diluted earnings per share (in shares)	34,700	30,645
Earnings per common share — basic (in dollars per share)	$ 0.91	$ 0.76
Earnings per common share — diluted (in dollars per share)	$ 0.91	$ 0.76
Number of antidilutive common stock equivalents excluded from diluted earnings per share computation (in shares)	2	0