Description of the Business and Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share
Antidilutive common share equivalents excluded from computation of earnings per share amount (in shares)	0	0	0
Net Income (Numerator)
Basic earnings per share (in dollars)	$ 3,214,066	$ 550,822	$ 671,103
Diluted earnings per share (in dollars)	$ 3,214,066	$ 550,822	$ 671,103
Weighted Average Shares (Denominator)
Basic earnings per share (in shares)	205,115,000	211,140,000	219,639,000
Dilutive common share equivalents (in shares)	1,500,000	1,205,000	1,109,000
Diluted earnings per share (in shares)	206,615,000	212,345,000	220,748,000
Per Share Amount
Basic (in dollars per share)	$ 15.67	$ 2.61	$ 3.06
Diluted (in dollars per share)	$ 15.56	$ 2.59	$ 3.04