Net Income Per Common Share (Schedule 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
Basic Net Income Per Common Share:
Net income available to common shareholders	$ 84,901	$ 153,034	$ 115,131	$ 270,070
Weighted average common shares outstanding (in shares)	147,288	157,389	147,300	159,148
Net income per common share, basic (in dollars per share)	$ 0.58	$ 0.97	$ 0.78	$ 1.70
Diluted Net Income Per Common Share:
Net income available to common shareholders	$ 84,901	$ 153,034	$ 115,131	$ 270,070
Weighted average common shares outstanding (in shares)	147,288	157,389	147,300	159,148
Effect of dilutive outstanding equity-based awards, warrants, and earnout payments (in shares)	445	1,688	767	1,760
Weighted average number of diluted common shares (in shares)	147,733	159,077	148,067	160,908
Net income per common share, diluted (in dollars per share)	$ 0.57	$ 0.96	$ 0.78	$ 1.68