Stock Compensation - Restricted Stock and Performance Share Grants - Compensation Costs (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation costs	$ 5,629	$ 3,958	$ 4,480
1998 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expensed	4,060	2,667	2,564
Capitalized	1,135	760	1,232
Stock compensation costs	5,195	3,427	3,796
NDSI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expensed	$ 434	$ 531	$ 684

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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