PROPERTY, PLANT, AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	$ 469,940	$ 469,940	$ 445,821
Accumulated depreciation	(269,310)	(269,310)	(248,737)
Property, plant, and equipment, net	200,630	200,630	197,084	$ 172,142
Interest costs capitalized		800	700	300
Write-off of property, plant, and equipment	16,300	16,306	0	$ 0
Land
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	12,489	12,489	11,930
Leasehold improvements
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	54,995	54,995	46,125
Buildings
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	67,465	67,465	63,749
Office equipment
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	18,193	18,193	14,440
Software
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	40,378	40,378	20,910
Machinery and equipment
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	243,939	243,939	232,777
Construction-in-progress
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	$ 32,481	$ 32,481	$ 55,890