Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 23,057	$ 48,384
Restricted cash	6,721	8,721
Trade accounts receivable, net of allowance for doubtful accounts of $7,847 in 2015 and $2,485 in 2014	184,172	226,966
Inventories	117,009	189,357
Assets held for sale	772	2,568
Prepaid expenses and other current assets	23,673	24,463
Total current assets	355,404	500,459
Property, plant, and equipment:
Land and building	79,462	75,200
Machinery and equipment	1,345,969	1,292,734
Automobiles and trucks	43,536	57,035
Chemical plants	181,014	174,108
Construction in progress	6,505	21,483
Total property, plant, and equipment	1,656,486	1,620,560
Less accumulated depreciation	(608,482)	(496,368)
Net property, plant, and equipment	1,048,004	1,124,192
Other assets:
Goodwill	112,945	293,866
Patents, trademarks, and other intangible assets, net of accumulated amortization of $44,695 in 2015 and $39,754 in 2014	86,375	107,167
Deferred tax assets	25	2,183
Other assets	53,623	54,521
Total other assets	252,968	457,737
Total assets	1,656,376	2,082,388
Current liabilities:
Trade accounts payable	62,114	119,240
Unearned income	27,542	70,688
Accrued liabilities	80,970	85,700
Current portion of long-term debt	50	90,074
Decommissioning and other asset retirement obligations, current	14,570	12,758
Total current liabilities	185,246	378,460
Long-term debt, net	873,402	844,961
Deferred income taxes	9,467	11,706
Decommissioning and other asset retirement obligations, net	42,879	49,983
Other liabilities	31,202	31,677
Total long-term and other liabilities	956,950	938,327
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	830	823
Additional paid-in capital	256,184	241,166
Treasury stock, at cost; 2,766,958 shares held at December 31, 2015, and 2,672,930 shares held at December 31, 2014	(16,837)	(16,419)
Accumulated other comprehensive income (loss)	(43,135)	(26,215)
Retained earnings	44,175	170,358
Total TETRA stockholders' equity	241,217	369,713
Noncontrolling interest	272,963	395,888
Total equity	514,180	765,601
Total liabilities and equity	$ 1,656,376	$ 2,082,388