CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ (1,433)	$ (4,476)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	16,412	14,294
Provision for bad debts	10,304	7,475
Equity in earnings of joint ventures	(2,279)	(1,102)
Distributions from joint ventures	2,038	3,041
Deferred rent amortization	443	925
Amortization of deferred financing costs and loan discount	1,368	1,288
Gain on sale and disposal of equipment	0	(38)
Stock-based compensation	2,733	3,554
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:
Accounts receivable	(25,291)	(12,498)
Other current assets	5,288	2,787
Other assets	856	(289)
Deferred taxes	(1,286)	(3,578)
Deferred revenue	(70)	(202)
Accounts payable, accrued expenses and other	11,880	6,288
Net cash provided by operating activities	20,963	17,469
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of imaging facilities	(5,007)	0
Purchase of property and equipment	(22,500)	(19,826)
Proceeds from sale of equipment	0	205
Equity contributions in existing joint ventures	(294)	0
Net cash used in investing activities	(27,801)	(19,621)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments on notes and leases payable	(3,166)	(2,030)
Payments on Term Loan Debt/Senior Notes	(6,178)	(5,190)
Net proceeds on revolving credit facility	16,300	9,400
Distributions paid to noncontrolling interests	(158)	(468)
Proceeds from issuance of common stock upon exercise of options/warrants	0	324
Net cash provided by financing activities	6,798	2,036
EFFECT OF EXCHANGE RATE CHANGES ON CASH	4	(37)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(36)	(153)
CASH AND CASH EQUIVALENTS, beginning of period	446	307
CASH AND CASH EQUIVALENTS, end of period	410	154
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	9,085	8,624
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Purchase of equipment and leasehold improvements not yet paid for	20,500	$ 12,300
Capital lease debt	$ 1,300