Stock Compensation - Restricted Stock and Performance Share Grants - Compensation Costs (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Stock Compensation Costs	$ 1,591	$ 1,132
1998 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation costs, expensed	1,111	666
Stock compensation costs, capitalized	366	319
Total Stock Compensation Costs	1,477	985
NDSI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation costs, expensed	$ 114	$ 147

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

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Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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