Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 54,163	$ 67,252
Restricted cash	65	65
Trade accounts receivable, net of allowances	62,408	64,078
Inventories	74,460	76,658
Assets of discontinued operations	0	710,006
Prepaid expenses and other current assets	14,296	13,487
Total current assets	205,392	931,546
Property, plant, and equipment:
Land and building	26,443	26,506
Machinery and equipment	362,564	365,296
Automobiles and trucks	17,982	18,446
Chemical plants	61,605	62,714
Construction in progress	955	1,526
Total property, plant, and equipment	469,549	474,488
Less accumulated depreciation	(376,994)	(377,632)
Net property, plant, and equipment	92,555	96,856
Other assets:
Patents, trademarks and other intangible assets, net of accumulated amortization	40,340	41,487
Deferred tax assets, net	89	52
Operating lease right-of-use assets	41,293	43,448
Investments	13,320	2,675
Other assets	14,189	16,775
Total other assets	109,231	104,437
Total assets	407,178	1,132,839
Current liabilities:
Trade accounts payable	29,057	22,573
Unearned income	1,202	2,675
Accrued liabilities	43,064	38,791
Liabilities of discontinued operations	1,746	734,039
Current portion of long-term debt	8,157	0
Total current liabilities	83,226	798,078
Long-term debt, net	163,003	199,894
Deferred income taxes	1,847	1,942
Decommissioning and other asset retirement obligations, net	12,620	12,484
Warranty Liability	521	198
Operating lease liabilities	35,608	37,569
Other liabilities	7,886	11,612
Total long-term liabilities	221,485	263,699
Equity:
Common stock, par value $0.01 per share	1,295	1,289
Additional paid-in capital	472,522	472,134
Treasury stock, at cost	(19,933)	(19,484)
Accumulated other comprehensive income (loss)	(45,525)	(49,914)
Retained earnings	(304,951)	(413,665)
Total TETRA stockholders' equity	103,408	(9,640)
Noncontrolling interests	(941)	80,702
Total equity	102,467	71,062
Total liabilities and equity	$ 407,178	$ 1,132,839