Quarterly report pursuant to Section 13 or 15(d)

SEGMENT INFORMATION (Details)

v3.5.0.2
SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]          
Net revenues $ 57,142 $ 66,938 $ 158,196 $ 181,431  
Operating profit (loss) before depreciation and amortization 6,693 13,375 23,345 36,949  
Operating profit (loss) 4,128 11,063 16,169 30,287  
Depreciation and amortization 2,565 2,312 7,176 6,662  
Capital expenditures 9,477 6,623 27,871 23,540  
Goodwill and intangible assets, net 44,932   44,932   $ 46,347
Total assets 283,155   283,155   257,791
Product Sales [Member]          
Segment Reporting Information [Line Items]          
Net revenues 52,114 63,190 143,661 170,396  
Processing Fees [Member]          
Segment Reporting Information [Line Items]          
Net revenues 5,028 3,748 14,535 11,035  
Eliminations [Member]          
Segment Reporting Information [Line Items]          
Goodwill and intangible assets, net 0   0   0
Total assets (131,352)   (131,352)   (122,371)
Corporate [Member]          
Segment Reporting Information [Line Items]          
Net revenues 0 0 0 0  
Operating profit (loss) before depreciation and amortization (1,238) (1,654) (5,128) (5,145)  
Operating profit (loss) (1,251) (1,672) (5,148) (5,163)  
Depreciation and amortization 13 18 20 18  
Goodwill and intangible assets, net 0   0   0
Total assets 100,264   100,264   98,728
Corporate [Member] | Product Sales [Member]          
Segment Reporting Information [Line Items]          
Net revenues 0 0 0 0  
Corporate [Member] | Processing Fees [Member]          
Segment Reporting Information [Line Items]          
Net revenues 0 0 0 0  
Petrochemical [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Net revenues 50,159 60,486 135,845 163,056  
Operating profit (loss) before depreciation and amortization 7,813 13,636 25,699 38,197  
Operating profit (loss) 6,366 12,557 21,488 35,075  
Depreciation and amortization 1,447 1,079 4,211 3,122  
Capital expenditures 5,411 4,857 16,812 17,876  
Goodwill and intangible assets, net 0   0   0
Total assets 209,319   209,319   195,358
Petrochemical [Member] | Operating Segments [Member] | Product Sales [Member]          
Segment Reporting Information [Line Items]          
Net revenues 47,250 59,122 129,076 158,647  
Petrochemical [Member] | Operating Segments [Member] | Processing Fees [Member]          
Segment Reporting Information [Line Items]          
Net revenues 2,909 1,364 6,769 4,409  
Specialty Wax [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Net revenues 6,983 6,452 22,351 18,375  
Operating profit (loss) before depreciation and amortization 118 1,393 2,774 3,897  
Operating profit (loss) (987) 178 (171) 375  
Depreciation and amortization 1,105 1,215 2,945 3,522  
Capital expenditures 4,066 1,766 11,059 5,664  
Goodwill and intangible assets, net 44,932   44,932   46,347
Total assets 104,924   104,924   $ 86,076
Specialty Wax [Member] | Operating Segments [Member] | Product Sales [Member]          
Segment Reporting Information [Line Items]          
Net revenues 4,864 4,068 14,585 11,749  
Specialty Wax [Member] | Operating Segments [Member] | Processing Fees [Member]          
Segment Reporting Information [Line Items]          
Net revenues $ 2,119 $ 2,384 $ 7,766 $ 6,626