Stock Compensation - Restricted Stock and Performance Share Grants - Compensation Costs (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation costs	$ 4,731	$ 5,629	$ 3,958
1998 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expensed	3,742	4,060	2,667
Capitalized	460	1,135	760
Stock compensation costs	4,202	5,195	3,427
NDSI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expensed	$ 529	$ 434	$ 531

Share-based Compensation Arrangement by Share-based Payment Award, Compensation Costs

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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Amount of cost capitalized for award under share-based payment arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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