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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income (loss) $ 1,949 $ (913)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 32,223 29,235
Provision for bad debts 22,630 15,862
Gain on return of common stock (5,032) 0
Equity in earnings of joint ventures (5,553) (4,309)
Distributions from joint ventures 2,098 6,195
Amortization of deferred financing costs and loan discount 2,738 2,631
Gain on sale and disposal of equipment 441 36
Stock-based compensation 3,761 5,571
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable (24,873) (19,368)
Other current assets 8,454 (3,058)
Other assets 220 (3,687)
Deferred taxes 333 (1,854)
Deferred rent 1,052 4,602
Deferred revenue 0 (564)
Accounts payable, accrued expenses and other 10,983 (2,423)
Net cash provided by operating activities 51,424 27,956
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities (6,603) (34,407)
Purchase of property and equipment (40,267) (31,649)
Proceeds from sale of equipment 63 205
Cash distribution from new JV partner 994 0
Equity contributions in existing and purchase of interest in joint ventures (734) (265)
Net cash used in investing activities (46,547) (66,116)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (6,310) (3,969)
Proceeds from borrowings 0 74,401
Payments on Term Loan Debt (12,357) (11,369)
Deferred financing costs 0 (531)
Net proceeds (repayments) on revolving credit facility 13,800 (15,300)
Distributions paid to noncontrolling interests (157) (613)
Proceeds from issuance of common stock upon exercise of options/warrants 150 594
Net cash (used in) provided by financing activities (4,874) 43,213
EFFECT OF EXCHANGE RATE CHANGES ON CASH (16) (41)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (13) 5,012
CASH AND CASH EQUIVALENTS, beginning of period 446 307
CASH AND CASH EQUIVALENTS, end of period 433 5,319
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Cash paid during the period for income taxes 0 0
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Purchase of equipment and leasehold improvements not yet paid for 15,400 $ 10,800
Capital lease debt 1,300  
Noncash gain from return of common stock 5,000  
Assets transferred to joint venture $ 2,700