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Earnings Per Share (Reconciliation of EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic EPS: [Abstract]
Net income, basic shares	60,183	59,862	59,421
Basic net income per share	$ 6.55	$ 4.12	$ 4.57
Effect of dilutive securities: [Abstract]
Stock compensation plans, shares	484	431	583
Earnings Per Share, Diluted [Abstract]
Shares net income, Diluted	60,667	60,293	60,004
Diluted net income per share	$ 6.50	$ 4.09	$ 4.53
Net Income available to common stockholders	$ 394,484	$ 246,355	$ 271,623

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