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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (152) $ (808)
Depreciation and amortization 14,892 13,921
Provision for bad debt 6,484 5,031
Equity in earnings of joint ventures (1,262) (1,484)
Distributions from joint ventures 1,575 1,764
Deferred rent amortization 288 105
Amortization of deferred financing cost 771 748
Amortization of bond discount 65 58
Loss on sale and disposal of equipment 24 259
Amortization of cash flow hedge 276 306
Stock-based compensation 1,175 1,048
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable (12,023) (12,607)
Other current assets (683) (2,345)
Other assets (64) 51
Deferred revenue 86 (186)
Accounts payable, accrued expenses and other 3,979 9,335
Net cash provided by operating activities 15,431 15,196
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities (580) (6,343)
Purchase of property and equipment (13,962) (15,616)
Proceeds from sale of equipment 410 235
Proceeds from sale of imaging facilities 2,300  
Purchase of equity interest in joint ventures (920) (1,500)
Net cash used in investing activities (12,752) (23,224)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (4,479) (6,490)
Deferred financing costs   (218)
Proceeds from, net of payments on, line of credit 2,700 15,900
Payments to counterparties of interest rate swaps, net of amounts received (1,500) (1,611)
Distributions to noncontrolling interests (26) (33)
Proceeds from issuance of common stock upon exercise of options/warrants   99
Net cash (used in) provided by financing activities (3,305) 7,647
EFFECT OF EXCHANGE RATE CHANGES ON CASH 5 13
NET DECREASE IN CASH AND CASH EQUIVALENTS (621) (368)
CASH AND CASH EQUIVALENTS, beginning of period 2,455 627
CASH AND CASH EQUIVALENTS, end of period 1,834 259
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Cash paid during the period for interest $ 6,841 $ 6,330