EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
EARNINGS PER SHARE OF COMMON STOCK, BASIC AND DILUTED [Line Items]
Net income	$ 206,434	$ 196,412	$ 186,749
Weighted Average Number of Shares Outstanding, Basic	53,575	53,133	52,895
Earnings Per Share, Basic	$ 3.85	$ 3.70	$ 3.53
Dilutive Securities, Effect on Basic Earnings Per Share	$ 0	$ 0	$ 0
Weighted Average Number Diluted Shares Outstanding Adjustment	99	237	345
Net Income (Loss) Available to Common Stockholders, Diluted	$ 206,434	$ 196,412	$ 186,749
Weighted Average Number of Shares Outstanding, Diluted	53,674	53,370	53,240
Earnings Per Share, Diluted	$ 3.85	$ 3.68	$ 3.51