PROPERTY, PLANT, AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	$ 469,940	$ 493,334	$ 469,940
Accumulated depreciation	(269,310)	(278,381)	(269,310)
Property, plant, and equipment, net	200,630	214,953	200,630	$ 197,084
Interest costs capitalized		800	800	700
Write-off of property, plant, and equipment	16,300	0	16,306	$ 0
Land
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	12,489	11,985	12,489
Leasehold improvements
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	54,995	59,604	54,995
Buildings
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	67,465	68,852	67,465
Office equipment
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	18,193	19,533	18,193
Software
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	40,378	43,436	40,378
Machinery and equipment
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	243,939	237,194	243,939
Construction-in-progress
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	$ 32,481	$ 52,730	$ 32,481