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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ 2,747 $ 2,798
Depreciation and amortization 29,785 28,217
Provision for bad debt 12,879 10,702
Equity in earnings of joint ventures (3,248) (2,751)
Distributions from joint ventures 3,375 2,370
Deferred rent amortization 2,582 1,310
Amortization of deferred financing cost 1,542 1,467
Amortization of bond discount 132 119
Loss (gain) on sale and disposal of equipment 300 (1,597)
Amortization of cash flow hedge 551 612
Stock-based compensation 1,706 1,790
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable (14,097) (30,514)
Other current assets (1,887) (1,363)
Other assets (29) (227)
Deferred revenue (68) (230)
Accounts payable, accrued expenses and other 4,547 10,164
Net cash provided by operating activities 40,817 22,867
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities (9,917) (11,529)
Purchase of property and equipment (25,347) (24,915)
Proceeds from insurance claims on damaged equipment 0 2,469
Proceeds from sale of equipment 446 291
Proceeds from sale of imaging facilities 2,300 0
Purchase of equity interest in joint ventures (920) (1,500)
Net cash used in investing activities (33,438) (35,184)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (8,016) (10,602)
Deferred financing costs 0 (217)
Proceeds from, net of payments on, line of credit 1,500 25,700
Payments to counterparties of interest rate swaps, net of amounts received (3,046) (3,219)
Distributions to noncontrolling interests (64) (71)
Proceeds from issuance of common stock upon exercise of options/warrants 0 242
Net cash (used in) provided by financing activities (9,626) 11,833
EFFECT OF EXCHANGE RATE CHANGES ON CASH 26 35
NET DECREASE IN CASH AND CASH EQUIVALENTS (2,221) (449)
CASH AND CASH EQUIVALENTS, beginning of period 2,455 627
CASH AND CASH EQUIVALENTS, end of period 234 178
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Cash paid during the period for interest $ 24,451 $ 23,229