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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, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 8,175	$ 76,388	$ 91,028	$ 88,132	$ 84,563	$ 179,160
Weighted-average number of common shares outstanding (for basic calculation)	27,911		27,720		27,851	27,708
Dilutive stock awards	422		580		477	501
Weighted-average number of common shares outstanding (for diluted calculation)	28,333		28,300		28,328	28,209
Basic earnings per share	$ 0.29		$ 3.28		$ 3.04	$ 6.47
Diluted earnings per share	$ 0.29		$ 3.22		$ 2.99	$ 6.35

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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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