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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (860) $ (1,107)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 16,654 16,412
Provision for bad debts 11,646 10,304
Equity in earnings of joint ventures (1,928) (2,279)
Distributions from joint ventures 2,323 2,038
Amortization of deferred financing costs and loan discount 814 1,368
Gain on sale and disposal of equipment (45) 0
Stock-based compensation 3,276 2,733
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable (16,974) (25,291)
Other current assets 4,043 5,288
Other assets 8 856
Deferred taxes (1,090) (1,612)
Deferred rent 1,976 443
Deferred revenue 58 (70)
Accounts payable, accrued expenses and other 10,995 11,880
Net cash provided by operating activities 30,896 20,963
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities (3,154) (5,007)
Investment at cost (500) 0
Purchase of property and equipment (30,371) (22,500)
Proceeds from sale of equipment 59 0
Equity contributions in existing joint ventures 0 (294)
Net cash used in investing activities (33,966) (27,801)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (2,158) (3,166)
Payments on Term Loan Debt/Senior Notes (6,063) (6,178)
Deferred financing costs and debt discount (570) 0
Proceeds on revolving credit facility 105,100 126,200
Payments on revolving credit facility (105,100) (109,900)
Dividends paid to noncontrolling interests (485) (158)
Net cash (used in) provided by financing activities (9,276) 6,798
EFFECT OF EXCHANGE RATE CHANGES ON CASH 2 4
NET DECREASE IN CASH AND CASH EQUIVALENTS (12,344) (36)
CASH AND CASH EQUIVALENTS, beginning of period 20,638 446
CASH AND CASH EQUIVALENTS, end of period 8,294 410
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Cash paid during the period for interest 11,035 9,085
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Purchase of equipment and leasehold improvements not yet paid for 19,000 20,500
Capital lease debt related to radiology equipment 5,200 0
Transfer of fixed assets to new joint venture $ 3,000 $ 0