Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 40,038	$ 26,128
Restricted cash	64	261
Trade accounts receivable, net of allowance for doubtful accounts	187,592	144,051
Inventories	143,571	115,438
Assets of discontinued operations	1,354	34,879
Note receivable, including accrued interest	7,544	0
Prepaid expenses and other current assets	20,528	17,597
Total current assets	400,691	338,354
Property, plant, and equipment:
Land and building	78,746	78,559
Machinery and equipment	1,265,732	1,167,680
Automobiles and trucks	35,568	34,744
Chemical plants	188,641	186,790
Construction in progress	44,419	31,566
Total property, plant, and equipment	1,613,106	1,499,339
Less accumulated depreciation	(759,175)	(689,907)
Net property, plant, and equipment	853,931	809,432
Other assets:
Goodwill	25,859	6,636
Patents, trademarks, and other intangible assets, net of accumulated amortization	82,184	47,405
Deferred tax assets	13	10
Long-term assets of discontinued operations	0	86,255
Other assets	22,849	20,522
Total other assets	130,905	160,828
Total assets	1,385,527	1,308,614
Current liabilities:
Trade accounts payable	80,279	70,847
Unearned income	26,695	18,701
Accrued liabilities	89,232	58,478
Disposal Group, Including Discontinued Operation, Liabilities, Current	4,145	25,688
Total current liabilities	200,351	173,714
Long-term debt, net	815,560	629,855
Deferred income taxes	3,242	4,404
Asset retirement obligations	12,202	11,738
CCLP Series A Preferred Units	27,019	61,436
Warrants liability	2,073	13,202
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	0	48,225
Other liabilities	12,331	13,479
Total long-term and other liabilities	872,427	782,339
Equity:
Common stock, par value $.01 per share; 100,000,000 shares authorized; 83,013,971 shares issued at December 31, 2015, and 82,322,876 shares issued at December 31, 2014	1,285	1,185
Additional paid-in capital	460,680	425,648
Treasury stock, at cost; 2,766,958 shares held at December 31, 2015, and 2,672,930 shares held at December 31, 2014	(18,950)	(18,651)
Accumulated other comprehensive income (loss)	(51,663)	(43,767)
Retained earnings	(217,952)	(156,335)
Total TETRA stockholders' equity	173,400	208,080
Noncontrolling interest	139,349	144,481
Total equity	312,749	352,561
Total liabilities and equity	$ 1,385,527	$ 1,308,614