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Description of business and basis of presentation (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Description of business and basis of presentation
Number of operating segments | segment	2
Non-qualified benefit plan assets	$ 9,376		$ 9,041
Amount of total benefit		$ 1,152
Retained earnings	$ 41,664		$ 47,712

X

- Definition

The amount of total benefit to cost of sales and selling, general and administrative Expense in connection with passage of CARES Act due to the COVID-19 crisis.

+ References

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- Definition

Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

+ References

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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