Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 17,704	$ 40,038
Restricted cash	64	64
Trade accounts receivable, net of allowance for doubtful accounts	176,513	187,592
Inventories	136,510	143,571
Assets of discontinued operations	0	1,354
Notes receivable	0	7,544
Prepaid expenses and other current assets	20,563	20,528
Total current assets	351,354	400,691
Property, plant, and equipment:
Land and building	60,586	78,746
Machinery and equipment	1,335,157	1,265,732
Automobiles and trucks	31,681	35,568
Chemical plants	57,692	188,641
Construction in progress	34,393	44,419
Total property, plant, and equipment	1,519,509	1,613,106
Less accumulated depreciation	(760,872)	(759,175)
Net property, plant, and equipment	758,637	853,931
Other assets:
Goodwill	0	25,859
Patents, trademarks, and other intangible assets, net of accumulated amortization	74,199	82,184
Deferred tax assets, net	24	13
Operating Lease, Right-of-Use Asset	68,131	0
Other assets	19,577	22,849
Total other assets	161,931	130,905
Total assets	1,271,922	1,385,527
Current liabilities:
Trade accounts payable	88,917	80,279
Unearned income	9,831	26,695
Accrued liabilities	87,877	89,232
Disposal Group, Including Discontinued Operation, Liabilities, Current	2,098	4,145
Total current liabilities	188,723	200,351
Long-term debt, net	842,871	815,560
Deferred income taxes	2,988	3,242
Asset retirement obligations	12,762	12,202
CCLP Series A Preferred Units	0	27,019
Warrants liability	449	2,073
Operating Lease, Liability, Noncurrent	53,919	0
Other liabilities	7,384	12,331
Total long-term and other liabilities	920,373	872,427
Equity:
Common stock, par value $.01 per share; 100,000,000 shares authorized; 83,013,971 shares issued at December 31, 2015, and 82,322,876 shares issued at December 31, 2014	1,283	1,285
Additional paid-in capital	466,959	460,680
Treasury stock, at cost; 2,766,958 shares held at December 31, 2015, and 2,672,930 shares held at December 31, 2014	(19,164)	(18,950)
Accumulated other comprehensive income (loss)	(52,183)	(51,663)
Retained earnings	(362,522)	(217,952)
Total TETRA stockholders' equity	34,373	173,400
Noncontrolling interest	128,453	139,349
Total equity	162,826	312,749
Total liabilities and equity	$ 1,271,922	$ 1,385,527