Investments (Tables)

12 Months Ended

Dec. 31, 2019

The following table details our investment balances at December 31, 2019 and 2018 (in thousands):



	December 31,
	2019		2018
Joint ventures	$	534,430	$	486,032
Nonmarketable securities	11,746		9,177
Marketable equity securities	33,637		33,513
Total	$	579,813	$	528,722

Ownership Positions in Significant Unconsolidated Investments

Our ownership positions in significant unconsolidated investments are shown below:



		December 31,
		2019		2018		2017
*	Windfield Holdings Pty. Ltd. - a joint venture with Sichuan Tianqi Lithium Industries, Inc., that mines lithium ore and produces lithium concentrate	49	%	49	%	49	%
*	Nippon Aluminum Alkyls - a joint venture with Mitsui Chemicals, Inc. that produces aluminum alkyls	50	%	50	%	50	%
*	Nippon Ketjen Company Limited - a joint venture with Sumitomo Metal Mining Company Limited that produces refinery catalysts	50	%	50	%	50	%
*	Eurecat S.A. - a joint venture with Axens Group for refinery catalysts regeneration services	50	%	50	%	50	%
*	Fábrica Carioca de Catalisadores S.A. - a joint venture with Petrobras Quimica S.A. - PETROQUISA that produces catalysts and includes catalysts research and product development activities	50	%	50	%	50	%

Summary of Assets, Liabilities and Results of Operations for Significant Unconsolidated Joint Ventures

The following summary lists the assets, liabilities and results of operations for our significant unconsolidated joint ventures presented herein (in thousands):



	December 31,
	2019		2018
Summary of Balance Sheet Information:
Current assets	$	473,426	$	476,460
Noncurrent assets	1,404,765		1,159,866
Total assets	$	1,878,191	$	1,636,326

Current liabilities	$	201,792	$	191,971
Noncurrent liabilities	583,839		422,769
Total liabilities	$	785,631	$	614,740



	Year Ended December 31,
	2019		2018		2017
Summary of Statements of Income Information:
Net sales	$	910,891	$	829,590	$	687,561
Gross profit	$	496,150	$	456,518	$	353,577
Income before income taxes	$	384,690	$	332,632	$	267,805
Net income	$	229,733	$	225,791	$	184,777