CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 38,133	$ 2,075	$ 8,004
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	72,899	66,796	66,610
Provision for bad debts		46,555	45,387
Gain on return from common stock	0	0	(5,032)
Equity in earnings of joint ventures	(11,377)	(13,554)	(9,767)
Distributions from joint ventures	24,846	8,690	2,926
Amortization and write off of deferred financing costs and loan discount	3,898	3,483	5,045
(Gain) loss on sale and disposal of equipment	(2,054)	1,142	767
Gain on sale of imaging centers	0	(3,146)	0
Gain on re-measurement of pre-existing interest	(39,539)	0	0
Loss on impairment	3,937	0	0
Stock-based compensation	7,662	6,787	5,826
Non cash severance	0	1,047	0
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:
Accounts receivable	2,145	(37,164)	(47,055)
Other current assets	(9,248)	1,461	11,038
Other assets	(1,687)	(801)	1,267
Deferred taxes	(6,935)	19,504	3,446
Deferred rent	6,312	2,135	(1,668)
Deferred revenue	(208)	1,034	(82)
Accounts payable, accrued expenses and other	27,970	36,181	4,929
Net cash provided by operating activities	116,754	142,225	91,641
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of imaging facilities	(73,192)	(27,612)	(6,641)
Investment at cost	(2,200)	(500)	0
Purchase of property and equipment	(72,180)	(61,336)	(59,251)
Proceeds from sale of equipment	2,575	852	481
Proceeds from sale of imaging and medical practice assets	0	8,429	0
Proceeds from sale of internal use software	248	492	301
Cash contribution from partner in JV formation	0	1,473	994
Equity contributions in existing and purchase of interest in joint ventures	(2,000)	(1,118)	(1,374)
Net cash used in investing activities	(146,749)	(79,320)	(65,490)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments on notes and leases payable	(6,072)	(6,836)	(11,880)
Proceeds from borrowings	0	170,000	476,504
Payments on senior notes	(33,830)	(196,666)	(469,086)
Payments on deferred financing costs and debt discount	0	(5,062)	(945)
Distributions paid to noncontrolling interests	(1,427)	(1,528)	(492)
Proceeds from sale of noncontrolling interest, net of taxes	0	7,720	992
Contributions from noncontrolling partners	2,640	125	0
Proceeds from revolving credit facility	204,300	200,800	435,900
Payments on revolving credit facility	(176,300)	(200,800)	(435,900)
Purchase of noncontrolling interests	(200)	0	(1,153)
Proceeds from issuance of common stock upon exercise of options	20	0	150
Net cash used in financing activities	(10,869)	(32,247)	(5,910)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(69)	26	(49)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(40,933)	30,684	20,192
CASH AND CASH EQUIVALENTS, beginning of period	51,322	20,638	446
CASH AND CASH EQUIVALENTS, end of period	10,389	51,322	20,638
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	37,016	34,197	37,487
Cash paid during the period for income taxes	4,933	4,939	2,798
Equipment acquired and leasehold improvements	47,800	18,500	28,800
Capital lease debt	0	5,500	1,300
Investment in joint venture, ScriptSender, LLC	268
Beach Imaging Group, LLC
Fixed assets acquired	15,000
Capital lease assumed	4,000
Noncontrolling Interest
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	5,890	2,022	774
Special distribution from noncontrolling interest	9,200
Radnet, Inc. Stockholders' Equity
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	32,243	$ 53	$ 7,230
Special distribution from noncontrolling interest	$ 3,000