BASIS OF PRESENTATION (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share
Net income	$ 30,131	$ 45,169	$ 50,171	$ 76,666
Weighted average common shares outstanding for basic earnings per share (in shares)	36,881	35,744	36,851	35,157
Assumed incremental common shares issued upon vesting of outstanding restricted stock units (in shares)	35	135	69	138
Weighted average common shares for diluted earnings per share (in shares)	36,916	35,879	36,920	35,295
Earnings per common share — basic (in dollars per share)	$ 0.82	$ 1.26	$ 1.36	$ 2.18
Earnings per common share — diluted (in dollars per share)	$ 0.82	$ 1.26	$ 1.36	$ 2.17
Number of antidilutive common stock equivalents excluded from diluted earnings per share computation (in shares)	54	7	1	7