Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 50,314	$ 67,252
Restricted cash	65	65
Trade accounts receivable, net of allowances	79,467	64,078
Inventories	70,071	76,658
Assets of discontinued operations	0	710,006
Prepaid expenses and other current assets	15,881	13,487
Total current assets	215,798	931,546
Property, plant, and equipment:
Land and building	26,477	26,506
Machinery and equipment	361,254	365,296
Automobiles and trucks	16,820	18,446
Chemical plants	62,015	62,714
Construction in progress	4,092	1,526
Total property, plant, and equipment	470,658	474,488
Less accumulated depreciation	(379,235)	(377,632)
Net property, plant, and equipment	91,423	96,856
Other assets:
Patents, trademarks and other intangible assets, net of accumulated amortization	39,237	41,487
Deferred tax assets, net	44	52
Operating lease right-of-use assets	39,517	43,448
Investments	16,221	2,675
Other assets	14,569	16,775
Total other assets	109,588	104,437
Total assets	416,809	1,132,839
Current liabilities:
Trade accounts payable	38,868	22,573
Unearned income	3,019	2,675
Accrued liabilities	44,069	38,791
Liabilities of discontinued operations	1,601	734,039
Current portion of long-term debt	8,157	0
Total current liabilities	95,714	798,078
Long-term debt, net	163,603	199,894
Deferred income taxes	1,939	1,942
Decommissioning and other asset retirement obligations, net	12,699	12,484
Warranty Liability	3,219	198
Operating lease liabilities	33,786	37,569
Other liabilities	6,792	11,612
Total long-term liabilities	222,038	263,699
Commitments and contingencies
Equity:
Common stock, par value $0.01 per share	1,297	1,289
Additional paid-in capital	473,872	472,134
Treasury stock, at cost	(19,939)	(19,484)
Accumulated other comprehensive income (loss)	(43,368)	(49,914)
Retained earnings	(311,704)	(413,665)
Total TETRA stockholders' equity	100,158	(9,640)
Noncontrolling interests	(1,101)	80,702
Total equity	99,057	71,062
Total liabilities and equity	$ 416,809	$ 1,132,839