Intangible and Other Assets

12 Months Ended

Dec. 31, 2018

Intangible And Other Assets [Abstract]

Intangible and Other Assets

3. Intangible and Other Assets

Following is a summary of intangible assets as of December 31:

		2018				2017
	Weighted Average Life	Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
Intangibles:
Patents and licenses, software and hardware designs	6 years	$	5,177	$	3,430	$	5,320	$	3,540
Developed technology	10 years		2,782		2,573		2,782		2,295
Customer relationships and non-compete	9 years		2,838		2,838		2,838		2,621
		$	10,797	$	8,841	$	10,940	$	8,456

Amortization expense for 2018 and 2017 was $889 and $921, respectively.  Estimated amortization expense for each of the ensuing years through December 31, 2023 is $602, $341, $324, $40 and $0, respectively.

Following is a summary of other assets as of December 31:

	2018		2017
Other assets:
Inventories - bauxite raw materials	$	4,160	$	3,527
Other		1,034		5,434
	$	5,194	$	8,961

Bauxite raw materials are used in the production of heavyweight ceramic products.  As of December 31, 2018 and 2017, the Company has classified as long-term assets those bauxite raw materials inventories that are not expected to be consumed in production during the upcoming twelve month period.  For additional information, refer to Note 5 – Other Operating (Income) Expense.  Other assets as of December 31, 2017 includes a $4,000 receivable relating to additional money owed us relating to the sale of our Russian proppant business.  This receivable was settled for $3,650 during 2018 and we recognized an additional loss on the sale of $350.  For additional information, refer to Note 18 – Sale of Russian Proppant Business.