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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (12,375) $ (1,366)
Depreciation and amortization 15,571 14,760
Provision for bad debts 6,893 6,822
Equity in earnings of joint ventures (1,067) (1,206)
Distributions from joint ventures 1,866 1,921
Deferred rent amortization 343 433
Amortization of deferred financing costs 552 457
Write off of deferred loan costs due to refinance 665 0
Amortization of bond and term loan discounts 616 400
Loss on sale and disposal of equipment 246 170
Loss on early extinguishment of Senior Notes 15,456 0
Stock-based compensation 1,025 952
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable (13,923) (11,782)
Other current assets (4,503) (5,099)
Other assets (575) (105)
Deferred taxes (4,536) 0
Deferred revenue (39) 3
Accounts payable and accrued expenses (11,075) 8,861
Net cash (used in) provided by operating activities (4,860) 15,221
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities (360) (3,625)
Purchase of property and equipment (17,047) (12,926)
Proceeds from sale of equipment 4 270
Proceeds from sale of joint venture interests 0 2,640
Equity contributions in existing joint ventures (789) (724)
Net cash used in investing activities (18,192) (14,365)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (1,929) (2,697)
Proceeds from borrowings 210,000 0
Payments on Senior Notes (204,468) 0
Deferred financing costs (6,650) 0
Proceeds from, net of payments on, line of credit 18,100 1,500
Distributions to noncontrolling interests (133) 0
Proceeds from issuance of common stock upon exercise of options/warrants 29 469
Net cash provided by (used in) financing activities 14,949 (728)
EFFECT OF EXCHANGE RATE CHANGES ON CASH (18) (59)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (8,121) 69
CASH AND CASH EQUIVALENTS, beginning of period 8,412 362
CASH AND CASH EQUIVALENTS, end of period 291 431
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Cash paid during the period for interest 14,508 5,531
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES    
Purchase of equipment and leasehold improvements not yet paid for 5,000 7,700
Capital lease debt relating to radiology equipment $ 12,600 $ 0