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COMBINED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 11,542 $ 12,392 $ 8,012
Depreciation and amortization 4,728 4,607 3,856
Provision for bad debt 2,777 2,752 2,211
Deferred rent amortization (155) (122) (112)
(Gain) loss on sale of equipment (143) (35) 195
Changes in operating assets and liabilities      
Accounts receivable (2,783) (3,022) (3,036)
Prepaid expenses and other current assets (69) (264) (31)
Due from affiliates (1,668) 1,293 (372)
Accounts payable, accrued expenses (84) (1,424) 878
Net cash provided by operating activities 14,145 16,177 11,601
CASH FLOWS FROM INVESTING ACTIVITIES      
Purchase of property and equipment (1,965) (1,091) (2,576)
Purchase of imaging facilities 0 (2,935) 0
Proceeds from sale of equipment 30 35 0
Net cash used in investing activities (1,935) (3,991) (2,576)
CASH FLOWS FROM FINANCING ACTIVITIES      
Principal payments on notes and leases payable (1,200) (2,976) (2,764)
Contributions from partners 0 2,300 0
Distributions to partners (12,500) (11,821) (5,980)
Net cash used in financing activities (13,700) (12,497) (8,744)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (1,490) (311) 281
CASH AND CASH EQUIVALENTS, beginning of period 1,778 2,089 1,808
CASH AND CASH EQUIVALENTS, end of period 288 1,778 2,089
Cash paid during the period for interest $ 86 $ 245 $ 381