Basis of Presentation (Earnings per share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income	$ 652,435	$ 503,399	$ 1,107,158	$ 807,506
Less: earnings distributed to participating securities	(217)	(294)	(434)	(592)
Less: undistributed earnings allocated to participating securities	(3,672)	(3,731)	(6,721)	(5,908)
Numerator for basic earnings per share	648,546	499,374	1,100,003	801,006
Add back: undistributed earnings allocated to participating securities	3,672	3,731	6,721	5,908
Less: undistributed earnings reallocated to participating securities	(3,644)	(3,722)	(6,677)	(5,895)
Numerator for diluted earnings per share	$ 648,574	$ 499,383	$ 1,100,047	$ 801,019
Denominator:
Basic shares outstanding (shares)	236,328	262,099	241,036	263,744
Effect of dilutive securities (shares)	1,318	648	1,193	627
Diluted shares outstanding (shares)	237,646	262,747	242,229	264,371
Earnings per share:
Basic earnings (usd per share)	$ 2.74	$ 1.91	$ 4.56	$ 3.04
Diluted earnings (usd per share)	$ 2.73	$ 1.90	$ 4.54	$ 3.03