Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 25,979	$ 40,038
Restricted cash	66	64
Trade accounts receivable, net of allowances	195,424	187,592
Inventories	138,424	143,571
Disposal Group, Including Discontinued Operation, Assets, Current	0	1,354
Notes, Loans and Financing Receivable, Gross, Current	7,627	7,544
Prepaid expenses and other current assets	25,326	20,528
Total current assets	392,846	400,691
Property, plant, and equipment:
Land and building	75,423	78,746
Machinery and equipment	1,294,944	1,265,732
Automobiles and trucks	35,381	35,568
Chemical plants	190,325	188,641
Construction in progress	50,016	44,419
Total property, plant, and equipment	1,646,089	1,613,106
Less accumulated depreciation	(785,654)	(759,175)
Net property, plant, and equipment	860,435	853,931
Other assets:
Goodwill	25,784	25,859
Patents, trademarks and other intangible assets, net of accumulated amortization	78,272	82,184
Deferred tax assets, net	20	13
Operating lease right-of-use assets	57,924	0
Other assets	23,905	22,849
Total other assets	185,905	130,905
Total assets	1,439,186	1,385,527
Current liabilities:
Trade accounts payable	85,757	80,279
Unearned income	32,200	26,695
Accrued liabilities	86,995	89,232
Disposal Group, Including Discontinued Operation, Liabilities, Current	2,510	4,145
Total current liabilities	207,462	200,351
Long-term debt, net	856,482	815,560
Deferred income taxes	3,809	3,242
Decommissioning and other asset retirement obligations, net	12,468	12,202
Preferred Units	7,894	27,019
Warranty Liability	960	2,073
Operating lease liabilities	47,398	0
Other liabilities	8,022	12,331
Total long-term liabilities	937,033	872,427
Equity:
Common stock, par value $0.01 per share	1,284	1,285
Additional paid-in capital	464,305	460,680
Treasury stock, at cost	(19,116)	(18,950)
Accumulated other comprehensive income (loss)	(51,480)	(51,663)
Retained earnings	(232,860)	(217,952)
Total TETRA stockholders' equity	162,133	173,400
Noncontrolling interests	132,558	139,349
Total equity	294,691	312,749
Total liabilities and equity	$ 1,439,186	$ 1,385,527