Property, Plant and Equipment

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

4. 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

Aggregate depreciation expenses totaled $15,562 thousand and $13,233 thousand for the six months ended June 30, 2018 and 2017, respectively.

As of June 29, 2018, the Company’s Korean subsidiary entered into an arrangement whereby it acquired a water treatment facility to support its fab in Gumi, Korea from SK Hynix for $4,172 thousand, and sold it for $4,172 thousand to a third party management company that the Company has engaged to run the facility for a 10-yearterm. This arrangement is accounted for as a financing due to the Company’s Korean subsidiary’s continuing involvement with the facility. As a result, as of June 30, 2018, the Company recorded the acquisition of water treatment facility of $4,172 thousand as property, plant and equipment, net, and the related liabilities of $553 thousand as other current liabilities and $3,619 thousand as other non-current liabilities, which relates to the financing and service portion of the arrangement.