PROPERTY AND EQUIPMENT PROPERTY AND EQUIPMENT (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Computer and office equipment, including equipment acquired under capital leases	$ 20,440,000	$ 14,443,000
Software capitalized for internal use	13,842,000	9,939,000
Vehicles, including equipment acquired under capital leases	2,056,000	1,540,000
Medical equipment	22,391,000	16,466,000
Work in progress	8,820,000	4,315,000
Furniture and fixtures	4,461,000	3,219,000
Leasehold improvements	12,232,000	7,164,000
Property, Plant and Equipment, Gross	84,242,000	57,086,000
Less: Accumulated depreciation	(42,630,000)	(33,365,000)
Property and equipment, net	41,612,000	23,721,000
Depreciation	13,555,000	8,513,000	6,591,000
Capitalized Computer Software, Amortization	1,724,000	1,325,000	800,000
Impairment of Long-Lived Assets to be Disposed of		5,800,000
Software and Software Development Costs
Property, Plant and Equipment [Line Items]
Work in progress	$ 700,000	$ 1,300,000