PROPERTY AND EQUIPMENT- (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 93,380		$ 93,380		$ 88,814
Less: Accumulated depreciation	(59,273)		(59,273)		(50,643)
Property and equipment, net	34,107		34,107		38,171
Depreciation	4,029	$ 4,205	12,464	$ 11,999
Capitalized Computer Software, Amortization	600	$ 600	1,900	$ 1,800
Computer and office equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	22,576		22,576		22,662
Software capitalized for internal use
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	15,600		15,600		14,914
Vehicles and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,062		2,062		2,106
Medical equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	28,528		28,528		27,668
Construction in progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,514		5,514		3,287
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	4,610		4,610		4,487
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 14,490		$ 14,490		$ 13,690