Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 29,473	$ 17,704
Restricted cash	53	64
Trade accounts receivable, net of allowances	169,231	176,291
Inventories	142,116	136,510
Disposal Group, Including Discontinued Operation, Assets, Current	0	0
Prepaid expenses and other current assets	23,107	20,785
Total current assets	363,980	351,354
Property, plant, and equipment:
Land and building	57,357	60,586
Machinery and equipment	1,347,642	1,335,157
Automobiles and trucks	30,052	31,681
Chemical plants	58,327	57,692
Construction in progress	24,760	34,393
Total property, plant, and equipment	1,518,138	1,519,509
Less accumulated depreciation	(777,891)	(760,872)
Net property, plant, and equipment	740,247	758,637
Other assets:
Patents, trademarks and other intangible assets, net of accumulated amortization	72,104	74,199
Deferred tax assets, net	24	24
Operating lease right-of-use assets	75,344	68,131
Other assets	18,065	19,577
Total other assets	165,537	161,931
Total assets	1,269,764	1,271,922
Current liabilities:
Trade accounts payable	88,204	88,917
Unearned income	28,422	9,831
Accrued liabilities	76,559	87,877
Disposal Group, Including Discontinued Operation, Liabilities, Current	2,011	2,098
Total current liabilities	195,196	188,723
Long-term debt, net	845,842	842,871
Deferred income taxes	2,762	2,988
Decommissioning and other asset retirement obligations, net	12,878	12,762
Warranty Liability	112	449
Operating lease liabilities	59,845	53,919
Other liabilities	6,198	7,384
Total long-term liabilities	927,637	920,373
Equity:
Common stock, par value $0.01 per share	1,287	1,283
Additional paid-in capital	468,088	466,959
Treasury stock, at cost	(19,253)	(19,164)
Accumulated other comprehensive income (loss)	(58,421)	(52,183)
Retained earnings	(364,073)	(362,522)
Total TETRA stockholders' equity	27,628	34,373
Noncontrolling interests	119,303	128,453
Total equity	146,931	162,826
Total liabilities and equity	$ 1,269,764	$ 1,271,922