COMBINED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 13,516	$ 13,178	$ 10,662
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,285	4,139	4,718
Provision for bad debts	2,796	2,824	2,832
Deferred rent amortization	(268)	(98)	(206)
Loss on sale and disposal of equipment	55	31	19
Changes in operating assets and liabilities
Accounts receivable	(7,609)	(1,056)	(1,669)
Prepaid expenses and other current assets	111	(409)	537
Due from affiliates	(4,766)	247	(2,718)
Accounts payable and accrued expenses	409	(646)	(459)
Net cash provided by operating activities	8,529	18,210	13,716
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property and equipment	(3,435)	(3,958)	(669)
Purchase of imaging facilities	(1,010)	0	0
Proceeds from sale of equipment	545	1	1
Net cash used in investing activities	(3,900)	(3,957)	(668)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments on notes and leases payable	(228)	(692)	(835)
Distributions to partners	(4,401)	(13,564)	(12,498)
Net cash used in financing activities	(4,629)	(14,256)	(13,333)
NET DECREASE IN CASH AND CASH EQUIVALENTS	0	(3)	(285)
CASH AND CASH EQUIVALENTS, beginning of period	0	3	288
CASH AND CASH EQUIVALENTS, end of period	0	0	3
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	$ 21	$ 34	$ 60