PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 91,853		$ 91,853		$ 88,814
Less: Accumulated depreciation	(56,947)		(56,947)		(50,643)
Property and equipment, net	34,906		34,906		38,171
Depreciation	4,130	$ 3,958	8,434	$ 7,794
Capitalized Computer Software, Amortization	600	$ 700	1,300	$ 1,100
Computer and office equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	22,869		22,869		22,662
Software capitalized for internal use
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	16,043		16,043		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	27,954		27,954		27,668
Construction in progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	4,379		4,379		3,287
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	4,548		4,548		4,487
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 13,998		$ 13,998		$ 13,690