Intangible Assets, Net, Intangible Assets, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Mar. 31, 2024
Finite-Lived Intangible Assets, Net [Abstract]
Gross amount	$ 147,690	$ 156,877
Accumulated amortization	(38,008)	(39,989)
Net carrying amount	109,682	116,888
Customer and Referral Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross amount	93,658	100,914
Accumulated amortization	(30,414)	(32,231)
Net carrying amount	63,244	$ 68,683
Estimated useful life		12 years 8 months 12 days
Customer and Referral Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Estimated useful life		7 years
Customer and Referral Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Estimated useful life		14 years
Tradenames [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross amount	44,573	$ 46,145
Accumulated amortization	0	0
Net carrying amount	44,573	46,145
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Impairment of tradename	1,700
Non-compete Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross amount	9,459	9,818
Accumulated amortization	(7,594)	(7,758)
Net carrying amount	$ 1,865	$ 2,060
Estimated useful life		5 years 6 months
Non-compete Agreements [Member] | Minimum [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Estimated useful life		5 years
Non-compete Agreements [Member] | Maximum [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Estimated useful life		6 years