CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (29,737)	$ 5,410
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35,483	32,368
Noncash operating lease expense	14,431	14,711
Equity in earnings of joint ventures, net of dividends	(2,599)	(4,324)
Amortization of deferred financing costs and loan discount	728	748
Loss on sale and disposal of equipment	402	186
Lease abandonment charges	5,388	0
Amortization of cash flow hedge, net of taxes	1,033	739
Non-cash change in fair value of interest rate swap	2,106	(1,216)
Stock-based compensation	28,494	11,897
Change in fair value of contingent consideration	0	1,974
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:
Accounts receivable	(14,306)	(25,865)
Other current assets	(7,206)	(6,277)
Other assets	(1,691)	(5,892)
Deferred taxes	5,137	(1,158)
Operating leases	(21,968)	(12,883)
Deferred revenue	128	(172)
Accounts payable, accrued expenses and other	25,658	6,841
Net cash provided by operating activities	41,481	17,088
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of imaging facilities and other acquisitions	(3,794)	(3,531)
Purchase of property and equipment and other	(48,833)	(57,409)
Proceeds from sale of equipment	23	2
Equity contributions in existing joint ventures	(4,147)	0
Net cash used in investing activities	(56,751)	(60,938)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments on notes and leases payable	(1,718)	(1,102)
Payments on term loan debt	(5,000)	(1,875)
Contribution from noncontrolling partners	0	4,169
Distributions paid to noncontrolling interests	(913)	0
Proceeds from sale of economic interests in majority owned subsidiary, net of taxes	0	8,713
Proceeds from issuance of common stock	0	218,383
Proceeds from issuance of common stock upon exercise of options	121	8
Net cash (used in) provided by financing activities	(7,510)	228,296
EFFECT OF EXCHANGE RATE CHANGES ON CASH	83	(36)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(22,697)	184,410
CASH AND CASH EQUIVALENTS, beginning of period	740,020	342,570
CASH AND CASH EQUIVALENTS, end of period	717,323	526,980
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	18,010	18,285
Cash paid during the period for income taxes	$ 272	1
Maximum
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on sale and disposal of equipment		$ 187