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Summary of Significant Accounting Policies - PPE (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, plant and equipment |  |  |
Depreciation and amortization expense | $ 8,806 | $ 8,256 | $ 7,613
Repairs and maintenance expenses | $ 6,089 | $ 6,256 | $ 6,032
Land improvements and buildings | Minimum |  |  |
Property, plant and equipment |  |  |
Estimated useful lives | 15 years |  |
Land improvements and buildings | Maximum |  |  |
Property, plant and equipment |  |  |
Estimated useful lives | 40 years |  |
Leasehold Improvements |  |  |
Property, plant and equipment |  |  |
Estimated useful lives | 12 years |  |
Leasehold Improvements | Minimum |  |  |
Property, plant and equipment |  |  |
Estimated useful lives | 12 years |  |
Machinery and equipment | Minimum |  |  |
Property, plant and equipment |  |  |
Estimated useful lives | 3 years |  |
Machinery and equipment | Maximum |  |  |
Property, plant and equipment |  |  |
Estimated useful lives | 20 years |  |
Furniture and fixtures | Minimum |  |  |
Property, plant and equipment |  |  |
Estimated useful lives | 3 years |  |
Furniture and fixtures | Maximum |  |  |
Property, plant and equipment |  |  |
Estimated useful lives | 12 years |  |
Mobile equipment and other | Minimum |  |  |
Property, plant and equipment |  |  |
Estimated useful lives | 3 years |  |
Mobile equipment and other | Maximum |  |  |
Property, plant and equipment |  |  |
Estimated useful lives | 10 years |  |

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- Definition The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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