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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				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 259,942	$ 158,294	$ 187,974	$ 127,101	$ 418,236	$ 315,075
Weighted-average number of common shares outstanding (for basic calculation)	27,905		28,134		27,974	28,130
Dilutive stock awards	187		367		222	412
Weighted-average number of common shares outstanding (for diluted calculation)	28,092		28,501		28,196	28,542
Basic earnings per share	$ 9.32		$ 6.68		$ 14.95	$ 11.20
Diluted earnings per share	$ 9.25		$ 6.60		$ 14.83	$ 11.04

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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