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Earnings Per Share (Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 257,138	$ 259,942	$ 158,294	$ 204,434	$ 187,974	$ 127,101	$ 675,374	$ 519,509
Weighted-average number of common shares outstanding (for basic calculation)	27,773			28,150			27,907	28,137
Dilutive stock awards	183			325			209	383
Weighted-average number of common shares outstanding (for diluted calculation)	27,956			28,475			28,116	28,520
Basic earnings per share	$ 9.26			$ 7.26			$ 24.20	$ 18.46
Diluted earnings per share	$ 9.20			$ 7.18			$ 24.02	$ 18.22

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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