Inventories

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Inventories

(6) Inventories

Inventories consisted of the following:

	March 31, 2017		December 31, 2016
	(in thousands)
Finished goods	$	23,263	$	15,860
Raw materials and precious metals	7,883		8,818
Parts and supplies	32,925		33,489
Total inventories	$	64,071	$	58,167