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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income (loss) $ 7,378 $ (2,610)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 43,836 45,193
Provision for bad debts 25,295 21,945
Equity in earnings of joint ventures (6,301) (4,722)
Distributions from joint ventures 6,255 7,358
Amortization and write off of deferred financing costs and loan discount 4,000 4,444
Loss on sale and disposal of equipment 774 1,581
Loss on early extinguishment of Senior Notes 0 15,927
Gain on sale of imaging centers (4,823) 0
Stock-based compensation 6,477 2,069
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable (32,485) (42,887)
Other current assets (15,628) (4,754)
Other assets (1,254) (72)
Deferred taxes 2,750 (2,461)
Deferred rent 6,034 653
Deferred revenue (641) 604
Accounts payable, accrued expenses and other (1,603) (8,225)
Net cash provided by operating activities 40,065 34,043
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities (41,237) (9,428)
Purchase of noncontrolling interests 0 (196)
Purchase of property and equipment (38,736) (33,895)
Proceeds from sale of equipment 648 766
Proceeds from sale of imaging facilities 35,500 0
Proceeds from sale of internal use software 443 0
Equity contributions in existing and purchase of interest in joint ventures (265) (1,161)
Net cash used in investing activities (43,647) (43,914)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (6,645) (16,733)
Proceeds from borrowings 74,401 210,000
Payments on Term Loan Debt/Senior Notes (17,548) (211,344)
Deferred financing costs (531) (6,650)
Net proceeds on revolving credit facility (15,300) 25,100
Distributions paid to noncontrolling interests (613) (148)
Proceeds from sale of non-controlling interests 5,005 0
Proceeds from issuance of common stock upon exercise of options/warrants 594 1,546
Net cash provided by financing activities 39,363 1,771
EFFECT OF EXCHANGE RATE CHANGES ON CASH (34) (38)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 35,747 (8,138)
CASH AND CASH EQUIVALENTS, beginning of period 307 8,412
CASH AND CASH EQUIVALENTS, end of period 36,054 274
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Cash paid during the period for interest 26,543 32,389
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Purchase of equipment and leasehold improvements not yet paid for $ 15,700 $ 16,600