Basis of Presentation and Significant Accounting Policies, Goodwill and Other Indefinite-Lived Intangible Assets (Details) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($)	Jun. 30, 2024 USD ($) Region ReportingUnit	Dec. 31, 2023 USD ($)
Goodwill and Other Indefinite-Lived Intangible Assets [Abstract]
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