Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 56,722	$ 17,704
Restricted cash	58	64
Trade accounts receivable, net of allowances	114,306	175,918
Inventories	115,506	136,510
Disposal Group, Including Discontinued Operation, Assets, Current	0	0
Prepaid expenses and other current assets	22,395	21,158
Total current assets	308,987	351,354
Property, plant, and equipment:
Land and building	57,766	60,586
Machinery and equipment	1,356,238	1,335,157
Automobiles and trucks	27,350	31,681
Chemical plants	58,990	57,692
Construction in progress	9,869	34,393
Total property, plant, and equipment	1,510,213	1,519,509
Less accumulated depreciation	(796,629)	(760,872)
Net property, plant, and equipment	713,584	758,637
Other assets:
Patents, trademarks and other intangible assets, net of accumulated amortization	70,175	74,199
Deferred tax assets, net	41	24
Operating lease right-of-use assets	75,524	68,131
Other assets	20,283	19,577
Total other assets	166,023	161,931
Total assets	1,188,594	1,271,922
Current liabilities:
Trade accounts payable	52,423	88,917
Unearned income	13,127	9,831
Accrued liabilities	79,904	87,877
Disposal Group, Including Discontinued Operation, Liabilities, Current	1,873	2,098
Total current liabilities	147,327	188,723
Long-term debt, net	843,292	842,871
Deferred income taxes	3,245	2,988
Decommissioning and other asset retirement obligations, net	12,862	12,762
Warranty Liability	123	449
Operating lease liabilities	60,693	53,919
Other liabilities	8,366	7,384
Total long-term liabilities	928,581	920,373
Equity:
Common stock, par value $0.01 per share	1,288	1,283
Additional paid-in capital	469,777	466,959
Treasury stock, at cost	(19,434)	(19,164)
Accumulated other comprehensive income (loss)	(57,441)	(52,183)
Retained earnings	(385,328)	(362,522)
Total TETRA stockholders' equity	8,862	34,373
Noncontrolling interests	103,824	128,453
Total equity	112,686	162,826
Total liabilities and equity	$ 1,188,594	$ 1,271,922