Stockholders’ Equity and Earnings Per Share (Earnings Per Share Calculations) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic:
Net income available to common stockholders	$ 872,981	$ 567,797	$ 674,035
Basic weighted average common shares outstanding (in shares)	141,826	142,336	145,497
Basic EPS (in dollars per share)	$ 6.16	$ 3.99	$ 4.63
Diluted:
Net income available to common stockholders	$ 872,981	$ 567,797	$ 674,035
Basic weighted average common shares outstanding (in shares)	141,826	142,336	145,497
Diluted potential common shares (in shares)	1,314	655	682
Diluted weighted average common shares outstanding (in shares)	143,140	142,991	146,179
Diluted EPS (in dollars per share)	$ 6.10	$ 3.97	$ 4.61