SEGMENT AND RELATED INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2013 segment	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
SEGMENT AND RELATED INFORMATION
Number of operating segments									2
Net sales
Customers	$ 271,053	$ 267,798	$ 229,350	$ 242,536	$ 247,902	$ 214,355	$ 497,148	$ 462,257	$ 768,201	$ 704,794	$ 974,429	$ 907,794	$ 808,766
Depreciation and amortization	9,224			8,709					28,019	25,432
Income (loss) from operations	39,906			35,373					99,266	92,834
Interest (income) expense	6,017			7,751					21,502	23,212
Extinguishment of debt									6,645
Income (loss) before taxes	33,889			27,622					71,119	69,622
Capital expenditures									27,470	24,877
Total assets	1,247,999								1,247,999		1,237,327
Patient Care
Summarized financial information concerning the Company's operating segments
Minimum age for health insurance coverage under Medicare health insurance program	65								65
Medicare reimbursement for O&P products and services based on prices set forth in fee schedules, number of regional service areas	10								10
Minimum age to supplement Medicare benefits for financially needy persons under Medicaid health insurance program	65								65
Estimated government reimbursement as a percentage of the company's net sales									40.50%	40.80%
Number of O&P provider locations									1,150
Number of O&P independent providers									400
Number of contracts with national and regional providers									57
Net sales
Customers	221,057			199,499					635,237	576,414
Depreciation and amortization	4,090			3,492					12,223	10,306
Income (loss) from operations	38,189			36,221					105,198	100,551
Interest (income) expense	7,729			7,520					23,154	22,657
Income (loss) before taxes	30,460			28,701					82,044	77,894
Capital expenditures									11,071	9,181
Total assets	1,485,779								1,485,779		1,389,223
Products and Services
Net sales
Customers	49,996			43,037					132,964	128,380
Intersegments	58,030			53,941					167,963	156,500
Depreciation and amortization	3,029			3,173					9,575	9,207
Income (loss) from operations	16,723			10,051					37,263	29,275
Interest (income) expense	3,338			2,236					10,011	6,771
Income (loss) before taxes	13,385			7,815					27,252	22,504
Capital expenditures									2,271	2,233
Total assets	376,184								376,184		336,318
Other
Net sales
Depreciation and amortization	2,105			2,044					6,221	5,919
Income (loss) from operations	(14,742)			(10,086)					(42,389)	(35,734)
Interest (income) expense	(5,050)			(2,005)					(11,663)	(6,216)
Extinguishment of debt									6,645
Income (loss) before taxes	(9,692)			(8,081)					(37,371)	(29,518)
Capital expenditures									14,128	13,463
Consolidating Adjustments
Net sales
Intersegments	(58,030)			(53,941)					(167,963)	(156,500)
Income (loss) from operations	(264)			(813)					(806)	(1,258)
Income (loss) before taxes	(264)			(813)					(806)	(1,258)
Total assets	$ (613,964)								$ (613,964)		$ (488,214)