Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 36,868	$ 40,038
Restricted cash	65	64
Trade accounts receivable, net of allowances	183,646	187,592
Inventories	156,628	143,571
Disposal Group, Including Discontinued Operation, Assets, Current	1,422	1,354
Notes, Loans and Financing Receivable, Gross, Current	7,586	7,544
Prepaid expenses and other current assets	24,078	20,528
Total current assets	410,293	400,691
Property, plant, and equipment:
Land and building	78,183	78,746
Machinery and equipment	1,286,832	1,265,732
Automobiles and trucks	35,519	35,568
Chemical plants	189,522	188,641
Construction in progress	49,540	44,419
Total property, plant, and equipment	1,639,596	1,613,106
Less accumulated depreciation	(778,647)	(759,175)
Net property, plant, and equipment	860,949	853,931
Other assets:
Goodwill	25,859	25,859
Patents, trademarks and other intangible assets, net of accumulated amortization	80,293	82,184
Deferred tax assets, net	13	13
Other assets	21,969	22,849
Operating lease right-of-use assets	60,149	0
Total other assets	188,283	130,905
Total assets	1,459,525	1,385,527
Current liabilities:
Trade accounts payable	88,223	80,279
Unearned income	50,379	26,695
Accrued liabilities	77,107	89,232
Disposal Group, Including Discontinued Operation, Liabilities, Current	3,529	4,145
Total current liabilities	219,238	200,351
Long-term debt, net	845,843	815,560
Deferred income taxes	3,456	3,242
Decommissioning and other asset retirement obligations, net	12,331	12,202
Preferred Units	18,278	27,019
Warranty Liability	2,480	2,073
Operating lease liabilities	49,632	0
Other liabilities	8,157	12,331
Total long-term liabilities	940,177	872,427
Equity:
Common stock, par value $0.01 per share	1,284	1,285
Additional paid-in capital	462,241	460,680
Treasury stock, at cost	(19,105)	(18,950)
Accumulated other comprehensive income (loss)	(52,245)	(51,663)
Retained earnings	(225,947)	(217,952)
Total TETRA stockholders' equity	166,228	173,400
Noncontrolling interests	133,882	139,349
Total equity	300,110	312,749
Total liabilities and equity	$ 1,459,525	$ 1,385,527