Stock Compensation - Restricted Stock and Performance Share Grants - Compensation Costs (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock compensation costs	$ 4,492	$ 2,450
1998 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation costs, expensed	3,239	1,523
Stock compensation costs, capitalized	926	520
Total stock compensation costs	4,165	2,043
NDSI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation costs, expensed	$ 327	$ 407

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

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