SEGMENT AND RELATED INFORMATION - SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) segment area	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
SEGMENT AND RELATED INFORMATION
Number of operating segments | segment	2
Net revenue	$ 233,995	$ 233,681
Material costs	76,356	74,405
Personnel expenses	86,108	87,955
Other expenses	61,578	70,725
Depreciation & amortization	9,330	10,137
Income (loss) from operations	623	(9,541)
Interest expense, net	12,263	14,009
Loss on extinguishment of debt	16,998
Non-service defined benefit plan	176	184
Income (loss) from operations before income taxes	(28,814)	(23,734)
Benefit for income taxes	(6,196)	(6,000)
Net income (loss)	(22,618)	(17,734)
Total assets	644,283		$ 640,423
Purchase of property, plant and equipment	4,388	2,348
Corporate & Other
SEGMENT AND RELATED INFORMATION
Other expenses	20,419	28,115
Depreciation & amortization	1,930	2,038
Income (loss) from operations	(22,349)	(30,153)
Interest expense, net	1,009	2,514
Loss on extinguishment of debt	16,998
Non-service defined benefit plan	176	184
Income (loss) from operations before income taxes	(40,532)	(32,851)
Benefit for income taxes	(6,196)	(6,000)
Net income (loss)	(34,336)	(26,851)
Intersegments
SEGMENT AND RELATED INFORMATION
Net revenue	(42,522)	(41,201)
Material costs	(42,522)	(41,201)
Consolidating Adjustments
SEGMENT AND RELATED INFORMATION
Net revenue	(42,522)	(41,201)
Material costs	$ (42,522)	(41,201)
Patient Care
SEGMENT AND RELATED INFORMATION
Medicare reimbursement for O&P products and services based on prices set forth in fee schedules, number of regional pricing areas | area	10
Net revenue	$ 188,507	187,637
Material costs	57,899	56,433
Personnel expenses	73,613	75,515
Other expenses	35,004	35,717
Depreciation & amortization	4,898	5,429
Income (loss) from operations	17,093	14,543
Interest expense, net	7,989	8,163
Income (loss) from operations before income taxes	9,104	6,380
Net income (loss)	9,104	6,380
Patient Care | Operating segments
SEGMENT AND RELATED INFORMATION
Net revenue	188,507	187,637
Material costs	52,175	50,609
Patient Care | Intersegments
SEGMENT AND RELATED INFORMATION
Material costs	5,724	5,824
Products & Services
SEGMENT AND RELATED INFORMATION
Net revenue	88,010	87,245
Material costs	60,979	59,173
Personnel expenses	12,495	12,440
Other expenses	6,155	6,893
Depreciation & amortization	2,502	2,670
Income (loss) from operations	5,879	6,069
Interest expense, net	3,265	3,332
Income (loss) from operations before income taxes	2,614	2,737
Net income (loss)	2,614	2,737
Products & Services | Operating segments
SEGMENT AND RELATED INFORMATION
Net revenue	45,488	46,044
Material costs	24,181	23,796
Products & Services | Intersegments
SEGMENT AND RELATED INFORMATION
Net revenue	42,522	41,201
Material costs	$ 36,798	$ 35,377