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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income	$ 1,946,320	$ 1,406,839	$ 1,016,700
Less: earnings distributed to participating securities	(1,218)	(1,106)	(1,228)
Less: undistributed earnings allocated to participating securities	(15,117)	(11,348)	(9,143)
Numerator for basic earnings per share	1,929,985	1,394,385	1,006,329
Add back: undistributed earnings allocated to participating securities	15,117	11,348	9,143
Less: undistributed earnings reallocated to participating securities	(15,080)	(11,312)	(9,117)
Numerator for diluted earnings per share	$ 1,930,022	$ 1,394,421	$ 1,006,355

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