CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (913)	$ (7,119)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	29,235	30,770
Provision for bad debts	15,862	14,413
Equity in earnings of joint ventures	(4,309)	(2,713)
Distributions from joint ventures	6,195	5,041
Amortization and write off of deferred financing costs and loan discount	2,631	3,156
Loss on sale and disposal of equipment	36	292
Loss on early extinguishment of Senior Notes	0	15,927
Stock-based compensation	5,571	1,636
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:
Accounts receivable	(19,368)	(27,361)
Other current assets	(3,058)	(2,877)
Other assets	(3,687)	55
Deferred taxes	(1,854)	(4,117)
Deferred rent	4,602	420
Deferred revenue	(564)	132
Accounts payable, accrued expenses and other	(2,423)	(7,977)
Net cash provided by operating activities	27,956	19,678
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of imaging facilities	(34,407)	(1,811)
Purchase of property and equipment	(31,649)	(26,798)
Proceeds from sale of equipment	205	4
Equity contributions in existing and purchase of interest in joint ventures	(265)	(900)
Net cash used in investing activities	(66,116)	(29,505)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments on notes and leases payable	(3,969)	(9,368)
Proceeds from borrowings	74,401	205,737
Payments on Term Loan Debt/Senior Notes	(11,369)	(211,344)
Deferred financing costs	(531)	(2,387)
Net proceeds on revolving credit facility	(15,300)	18,980
Distributions paid to noncontrolling interests	(613)	(139)
Proceeds from issuance of common stock upon exercise of options/warrants	594	786
Net cash provided by financing activities	43,213	2,265
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(41)	(19)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	5,012	(7,581)
CASH AND CASH EQUIVALENTS, beginning of period	307	8,412
CASH AND CASH EQUIVALENTS, end of period	5,319	831
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	18,283	23,464
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Purchase of equipment and leasehold improvements not yet paid for	$ 10,800	$ 13,800