Annual report pursuant to Section 13 and 15(d)

SEGMENT INFORMATION (Details)

SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended								12 Months Ended
SEGMENT INFORMATION (Details) $ in Thousands	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| Segment									2
Net revenues	$ 74,669	$ 73,416	$ 68,106	$ 71,741	$ 65,978	$ 61,508	$ 62,115	$ 55,542	$ 287,932	$ 245,143	$ 212,399
Operating profit (loss) before depreciation and amortization									16,695	29,063
Operating profit (loss)									2,335	18,102	18,707
Profit (loss) before taxes									(3,139)	10,850	$ 29,932
Depreciation and amortization									14,358	10,961
Capital expenditures									25,285	14,053
Goodwill and intangible assets, net	40,745				42,606				40,745	42,606
Total assets	329,968				327,326				329,968	327,326
Corporate
Segment Reporting Information [Line Items]
Net revenues									0	0
Operating profit (loss) before depreciation and amortization									(8,275)	(7,413)
Operating profit (loss)									(8,327)	(7,475)
Profit (loss) before taxes									(9,184)	(11,764)
Depreciation and amortization									50	62
Capital expenditures									0	0
Goodwill and intangible assets, net	0				0				0	0
Total assets	91,474				97,880				91,474	97,880
Eliminations
Segment Reporting Information [Line Items]
Goodwill and intangible assets, net	0				0				0	0
Total assets	(161,239)				(153,346)				(161,239)	(153,346)
Specialty Petrochemical \| Operating Segments
Segment Reporting Information [Line Items]
Net revenues									249,679	210,381
Operating profit (loss) before depreciation and amortization									23,021	36,511
Operating profit (loss)									14,089	30,201
Profit (loss) before taxes									10,705	27,852
Depreciation and amortization									8,932	6,310
Capital expenditures									22,431	38
Goodwill and intangible assets, net	0				0				0	0
Total assets	284,367				265,213				284,367	265,213
Specialty Wax \| Operating Segments
Segment Reporting Information [Line Items]
Net revenues									38,253	34,762
Operating profit (loss) before depreciation and amortization									1,949	(35)
Operating profit (loss)									(3,427)	(4,624)
Profit (loss) before taxes									(4,660)	(5,238)
Depreciation and amortization									5,376	4,589
Capital expenditures									2,854	14,015
Goodwill and intangible assets, net	40,745				42,606				40,745	42,606
Total assets	$ 115,366				$ 117,579				$ 115,366	$ 117,579