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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
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 127,101	$ 76,388
Weighted-average number of common shares outstanding (for basic calculation)	28,125	27,792
Dilutive stock awards	457	531
Weighted-average number of common shares outstanding (for diluted calculation)	28,582	28,323
Basic earnings per share	$ 4.52	$ 2.75
Diluted earnings per share	$ 4.45	$ 2.70

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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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