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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets |  |  |
Amortization expense | $ 5,729 | $ 6,445 | $ 6,966
Finite-lived intangible assets, carrying value | 36,897 | 42,113 |
Accumulated amortization | 43,379 | 38,656 |
Customer relationships |  |  |
Finite-Lived Intangible Assets |  |  |
Finite-lived intangible assets, carrying value | 20,355 | 22,152 |
Accumulated amortization | 15,914 | 13,453 |
Customer relationships | Test and Inspection Services |  |  |
Finite-Lived Intangible Assets |  |  |
Finite-lived intangible assets, carrying value | 1,893 |  |
Accumulated amortization | 587 |  |
Non-compete agreements |  |  |
Finite-Lived Intangible Assets |  |  |
Fully amortized intangible asset | $ 1,232 | 2,830 |
Trademarks and trade names |  |  |
Finite-Lived Intangible Assets |  |  |
Fully amortized intangible asset |  | $ 723 |
Minimum |  |  |
Finite-Lived Intangible Assets |  |  |
Finite lived intangible asset, useful life | 5 years |  |
Maximum |  |  |
Finite-Lived Intangible Assets |  |  |
Finite lived intangible asset, useful life | 25 years |  |
Weighted Average |  |  |
Finite-Lived Intangible Assets |  |  |
Finite lived intangible asset, useful life | 16 years |  |
Weighted Average | Customer relationships |  |  |
Finite-Lived Intangible Assets |  |  |
Finite lived intangible asset, useful life | 18 years | 18 years |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: 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=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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