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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income before income tax	$ 41,376	$ 60,383	$ 77,958	$ 112,784	$ 141,909	$ 202,292
Income tax expense	$ (10,433)	$ 767	$ 19,196	$ (3,929)	$ 60,650	$ 61,417
Effective tax rate (as a percent)	(25.20%)		24.60%	(3.50%)	42.70%
Unrecognized tax benefits, period decrease				$ 2,000
Unrecognized tax benefits approximate amount of estimated reduction within the next twelve months	$ 12,000			$ 12,000

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Sum of operating profit and nonoperating income (expense) before, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest.

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