Net Income Per Common Share (Schedule Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 373,695	$ 563,780	$ 428,476
Preferred stock dividends	33,163	22,881	17,998
Net income available to common shareholders	$ 340,532	$ 540,899	$ 410,478
Weighted average common shares outstanding	147,415	154,331	117,644
Potentially dilutive shares from outstanding equity-based awards, warrants, and earnout payments	795	1,727	734
Weighted average diluted common shares	148,210	156,058	118,378
Net income per common share, basic	$ 2.31	$ 3.50	$ 3.49
Net income per common share, diluted	$ 2.30	$ 3.47	$ 3.47