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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic earnings per share:
Net income	$ 150,021	$ 149,805
Weighted average common shares outstanding - basic (in shares)	338,904	344,053
Basic earnings per share (in dollars per share)	$ 0.44	$ 0.44
Diluted earnings per share:
Net income	$ 150,021	$ 149,805
Diluted income available to common shareholders	$ 153,733	$ 154,371
Weighted average common shares outstanding - basic (in shares)	338,904	344,053
Effect of dilutive securities:
Weighted average common shares outstanding - diluted (in shares)	356,383	365,216
Diluted earnings per share (in dollars per share)	$ 0.43	$ 0.42
Federal statutory income tax rate (in hundredths)	21.00%	21.00%
9% Convertible Junior Subordinated Debentures
Diluted earnings per share:
Dilutive securities	$ 3,712	$ 4,566
Effect of dilutive securities:
Dilutive securities (in shares)	15,785	19,130
Stated interest rate	9.00%
Unvested RSUs
Effect of dilutive securities:
Unvested RSUs (in shares)	1,694	2,033

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