Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

Summary of Property, Plant and Equipment

Property, plant and equipment as of June 30, 2018 and December 31, 2017 are comprised of the following (in thousands):

	June 30, 2018			December 31, 2017
Buildings and related structures	$	70,194		$	69,958
Machinery and equipment		302,207			308,713
Others		45,158			42,497
		417,559			421,168
Less: accumulated depreciation		(235,894	)		(231,356	)
Land		15,369			16,091
Property, plant and equipment, net	$	197,034		$	205,903