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Basis of Presentation and Significant Accounting Policies, Goodwill and Other Indefinite-Lived Intangible Assets (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) Segment ReportingUnit Region	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Goodwill and Other Indefinite-Lived Intangible Assets [Abstract]
Number of business segments | Segment	2
Number of regions | Region	6
Goodwill impairment	$ 0		$ 15,800
Impairment of long-lived assets	$ 0
Industrial Injury Prevention Services [Member]
Goodwill and Other Indefinite-Lived Intangible Assets [Abstract]
Number of reporting units | ReportingUnit	2
Goodwill impairment		$ 15,800	15,800
Impairment of tradename		$ 1,700	$ 1,700
Other [Member]
Goodwill and Other Indefinite-Lived Intangible Assets [Abstract]
Number of reporting units | ReportingUnit	7
Impairment of goodwill and tradenames	$ 0

X

- Definition

Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

+ References

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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Number of regions of the entity operates.

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