EARNINGS PER SHARE (Summary Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income attributable to common stockholders									$ 725,694	$ 312,861	$ 119,497
Weighted average common shares outstanding - basic (shares)									62,464,000	67,386,000	70,357,000
Plus: dilutive effect of stock options and unvested restricted stock units (shares)									1,254,000	1,158,000	1,414,000
Weighted average common shares outstanding - diluted (shares)									63,718,000	68,544,000	71,771,000
Basic (in dollars per share)	$ 2.63	$ 2.47	$ 5.02	$ 1.50	$ 2.75	$ 0.92	$ 0.84	$ 0.16	$ 11.62	$ 4.64	$ 1.70
Diluted (in dollars per share)	$ 2.57	$ 2.42	$ 4.93	$ 1.47	$ 2.69	$ 0.91	$ 0.83	$ 0.16	$ 11.39	$ 4.56	$ 1.66
Outstanding shares issued under share-based compensation awards excluded from computation of diluted EPS (less than) (shares)									100,000	0	0