BASIS OF PRESENTATION (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share
Net income	$ 45,169	$ 27,879	$ 76,666	$ 51,147
Preferred dividends	0	(13)	0	(26)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 45,169	$ 27,866	$ 76,666	$ 51,121
Weighted average common shares outstanding for basic earnings per share (in shares)	35,744	32,621	35,157	31,537
Assumed incremental common shares issued upon vesting of outstanding restricted stock units (in shares)	135	210	138	209
Weighted average common shares for diluted earnings per share (in shares)	35,879	32,831	35,295	31,746
Earnings per common share — basic (in dollars per share)	$ 1.26	$ 0.85	$ 2.18	$ 1.62
Earnings per common share — diluted (in dollars per share)	$ 1.26	$ 0.85	$ 2.17	$ 1.61
Number of antidilutive common stock equivalents excluded from diluted earnings per share computation (in shares)	7	0	7	0