Stock Compensation - Restricted Stock and Performance Share Grants - Compensation Costs (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Stock Compensation Costs	$ 2,225	$ 2,398
1998 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation costs, expensed	1,311	1,411
Stock compensation costs, capitalized	633	622
Total Stock Compensation Costs	1,944	2,033
NDSI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation costs, expensed	$ 281	$ 365

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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