Inventory (Tables)

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Schedule of inventories

Inventory as of December 31, 2019 and March 31, 2020 consisted of the following (in thousands):

	December 31,		March 31,
	2019		2020
Raw materials and spare parts	$	29,874	$	29,725
Total inventory	$	29,874	$	29,725