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Discontinued Operations - Assets and Liabilities of the Discontinued Operations (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Current assets: |  |
Total current assets | $ 0 | $ 6,308
Current liabilities: |  |
Total current liabilities | $ 330 | 5,638
Test and Inspection Services | Discontinued Operations, Disposed of by Sale |  |
Current assets: |  |
Accounts receivable - net |  | 4,959
Inventories - net |  | 840
Other current assets |  | 509
Total current assets |  | 6,308
Property, plant, and equipment - net |  | 21,879
Operating lease right-of-use assets - net |  | 1,994
Other assets: |  |
Other intangibles - net |  | 1,401
Deferred tax assets |  | 9,116
Other assets |  | 83
Total assets |  | 40,781
Current liabilities: |  |
Accounts payable |  | 3,332
Accrued payroll and employee benefits |  | 902
Current maturities of long-term debt |  | 28
Other accrued liabilities |  | 1,376
Total current liabilities |  | 5,638
Long-term debt |  | 13
Long-term operating lease liabilities |  | 1,256
Other long-term liabilities |  | 4,342
Total liabilities |  | $ 11,249

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