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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 15,427	$ 9,842
Other comprehensive income (loss), net of tax:
Change in Company-sponsored post-employment benefit plan	55	(6)
Comprehensive income	$ 15,482	$ 9,836

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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