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v3.20.4

Property, Plant and Equipment (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 19, 2018 USD ($) a | Dec. 31, 2020 USD ($) a | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Property, Plant and Equipment |  |  |  |
Gross property, plant, and equipment |  | $ 168,638 | $ 159,304 |
Less: accumulated depreciation and amortization, including accumulated amortization of finance leases |  | (106,553) | (98,869) |
Property, plant, and equipment - net |  | 62,085 | 60,435 |
Depreciation |  | 7,850 | 7,944 | $ 8,066
Proceeds from the sale of property, plant, and equipment |  | 16 | 930 | 2,309
Land in Willis, TX | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Tubular and Energy Services |  |  |  |
Property, Plant and Equipment |  |  |  |
Proceeds from the sale of property, plant, and equipment | $ 2,047 |  |  |
Area of land (in acres) | a | 54.5 |  |  |
Ball Winch Field Service | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Tubular and Energy Services |  |  |  |
Property, Plant and Equipment |  |  |  |
Loss on sale of land |  |  |  | $ 269
Land |  |  |  |
Property, Plant and Equipment |  |  |  |
Gross property, plant, and equipment |  | $ 6,627 | 6,612 |
Area of land (in acres) | a |  | 54.5 |  |
Improvements to land and leaseholds |  |  |  |
Property, Plant and Equipment |  |  |  |
Gross property, plant, and equipment |  | $ 17,573 | 17,172 |
Buildings |  |  |  |
Property, Plant and Equipment |  |  |  |
Gross property, plant, and equipment |  | 27,348 | 25,370 |
Machinery and equipment, including equipment under finance leases |  |  |  |
Property, Plant and Equipment |  |  |  |
Gross property, plant, and equipment |  | 116,175 | 106,372 |
Construction in progress |  |  |  |
Property, Plant and Equipment |  |  |  |
Gross property, plant, and equipment |  | 915 | $ 3,778 |
Land and Building |  |  |  |
Property, Plant and Equipment |  |  |  |
Proceeds from the sale of property, plant, and equipment |  | 900 |  |
Gain on sale of property |  | $ 198 |  |

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