PROPERTY PLANT AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Property, Plant and Equipment, Net
Total property, plant, and equipment, gross	$ 272,950		$ 272,950		$ 266,184
Less: accumulated depreciation	(183,526)		(183,526)		(172,569)
Total property, plant, and equipment, net	89,424		89,424		93,615
Depreciation expense	7,500	$ 7,300	22,300	$ 22,400
Land
Property, Plant and Equipment, Net
Total property, plant, and equipment, gross	644		644		644
Buildings
Property, Plant and Equipment, Net
Total property, plant, and equipment, gross	25,475		25,475		28,180
Furniture and fixtures
Property, Plant and Equipment, Net
Total property, plant, and equipment, gross	14,231		14,231		12,968
Machinery and equipment
Property, Plant and Equipment, Net
Total property, plant, and equipment, gross	27,551		27,551		26,838
Therapeutic program equipment leased to third parties under operating leases
Property, Plant and Equipment, Net
Total property, plant, and equipment, gross	29,059		29,059		31,100
Leasehold improvements
Property, Plant and Equipment, Net
Total property, plant, and equipment, gross	106,885		106,885		100,999
Computers and software
Property, Plant and Equipment, Net
Total property, plant, and equipment, gross	$ 69,105		$ 69,105		$ 65,455