Supplemental Financial Information (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges	$ 1,506	$ 0
Severance benefits expensed	500
Unusual or Infrequent Item, or Both [Line Items]
Fixed assets write-offs	891	0
Inventory charges	280	0
Lease obligations	486	0
Professional services	522	0
Compensation & benefits	244	0
Insurance recoveries	1,119	$ 0
AES
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges	1,500
EMS
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges	0
UTIS Fire
Unusual or Infrequent Item, or Both [Line Items]
Fixed assets write-offs	900
Inventory charges	300
Lease obligations	500
Professional services	500
Compensation & benefits	200
Insurance recoveries	1,100
Deductible	$ 300

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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