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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 1,395 $ 2,747
Depreciation and amortization 29,288 29,785
Provision for bad debt 13,777 12,879
Equity in earnings of joint ventures (2,864) (3,248)
Distributions from joint ventures 3,971 3,375
Deferred rent amortization 1,844 2,582
Amortization of deferred financing cost 1,066 1,205
Amortization of bond and term loan discount 1,025 469
Loss on sale and disposal of equipment 362 300
Gain on sale of imaging centers (2,108) 0
Amortization of cash flow hedge 0 551
Stock-based compensation 1,582 1,706
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable (23,171) (14,097)
Other current assets (423) (1,887)
Other assets 190 (29)
Deferred taxes 692 0
Deferred revenue 75 (68)
Accounts payable, accrued expenses and other 2,076 4,547
Net cash provided by operating activities 28,777 40,817
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities (3,625) (9,917)
Purchase of property and equipment (28,349) (25,347)
Proceeds from sale of equipment 505 446
Proceeds from sale of imaging facilities 3,920 2,300
Proceeds from sale of joint venture interests 2,640 0
Purchase of equity interest in joint ventures (1,803) (920)
Net cash used in investing activities (26,712) (33,438)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (5,211) (8,016)
Deferred financing costs (432) 0
Proceeds from borrowings upon refinancing 35,122 0
Net (payments on) proceeds from line of credit (32,000) 1,500
Payments to counterparties of interest rate swaps, net of amounts received 0 (3,046)
Distributions to noncontrolling interests (7) (64)
Proceeds from issuance of common stock upon exercise of options/warrants 469 0
Net cash used in financing activities (2,059) (9,626)
EFFECT OF EXCHANGE RATE CHANGES ON CASH (117) 26
NET DECREASE IN CASH AND CASH EQUIVALENTS (111) (2,221)
CASH AND CASH EQUIVALENTS, beginning of period 362 2,455
CASH AND CASH EQUIVALENTS, end of period 251 234
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Cash paid during the period for interest $ 21,792 $ 24,451