EARNINGS PER SHARE (Summary Of Basic And Diluted 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 [Abstract]
Net income	$ 56,551	$ 39,198	$ 67,642	$ 63,908
Weighted average common shares outstanding - basic (in shares)	67,416	70,936	67,674	71,967
Plus: dilutive effect of stock options and unvested restricted stock units (in shares)	622	979	990	1,402
Weighted average common shares outstanding - diluted (in shares)	68,038	71,915	68,664	73,369
Basic (in dollars per share)	$ 0.84	$ 0.55	$ 1.00	$ 0.89
Diluted (in dollars per share)	$ 0.83	$ 0.55	$ 0.99	$ 0.87