Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2015

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of Other Current Assets [Table Text Block]

Other current assets were as follows:

	December 31,
	2015		2014
	(In thousands)
Excise and other taxes receivable	$	3,860	$	1,508
Material and chemical inventories	871		986
Exchange and other receivables	831		56
Other current assets	$	5,562	$	2,550