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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]          
Net revenues $ 48,854 $ 59,350 $ 101,054 $ 114,493  
Operating profit before depreciation and amortization 8,111 11,600 16,652 23,574  
Operating profit (loss) 5,896 9,491 12,041 19,224  
Depreciation and amortization 2,215 2,109 4,611 4,350  
Capital expenditures 10,792 9,107 18,394 16,850  
Goodwill and intangible assets, net 45,403   45,403   $ 46,347
Total assets 279,652   279,652   257,791
Product Sales [Member]          
Segment Reporting Information [Line Items]          
Net revenues 44,366 56,665 91,547 107,206  
Processing Fees [Member]          
Segment Reporting Information [Line Items]          
Net revenues 4,488 2,685 9,507 7,287  
Eliminations [Member]          
Segment Reporting Information [Line Items]          
Goodwill and intangible assets, net 0   0   0
Total assets (129,633)   (129,633)   (122,371)
Corporate [Member]          
Segment Reporting Information [Line Items]          
Net revenues 0 0 0 0  
Operating profit before depreciation and amortization (1,949) (1,679) (3,881) (3,491)  
Operating profit (loss) (1,956) (1,679) (3,897) (3,491)  
Depreciation and amortization 7 0 16 0  
Goodwill and intangible assets, net 0   0   0
Total assets 102,719   102,719   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 41,621 53,863 85,686 102,570  
Operating profit before depreciation and amortization 9,476 12,850 17,886 24,562  
Operating profit (loss) 8,048 11,902 15,122 22,519  
Depreciation and amortization 1,428 948 2,764 2,043  
Capital expenditures 5,739 6,204 11,401 13,019  
Goodwill and intangible assets, net 0   0   0
Total assets 204,114   204,114   195,358
Petrochemical [Member] | Operating Segments [Member] | Product Sales [Member]          
Segment Reporting Information [Line Items]          
Net revenues 39,202 52,342 81,826 99,525  
Petrochemical [Member] | Operating Segments [Member] | Processing Fees [Member]          
Segment Reporting Information [Line Items]          
Net revenues 2,419 1,521 3,860 3,045  
Specialty Wax [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Net revenues 7,233 5,487 15,368 11,923  
Operating profit before depreciation and amortization 584 429 2,647 2,503  
Operating profit (loss) (196) (732) 816 196  
Depreciation and amortization 780 1,161 1,831 2,307  
Capital expenditures 5,053 2,903 6,993 3,831  
Goodwill and intangible assets, net 45,403   45,403   46,347
Total assets 102,452   102,452   $ 86,076
Specialty Wax [Member] | Operating Segments [Member] | Product Sales [Member]          
Segment Reporting Information [Line Items]          
Net revenues 5,164 4,323 9,721 7,681  
Specialty Wax [Member] | Operating Segments [Member] | Processing Fees [Member]          
Segment Reporting Information [Line Items]          
Net revenues $ 2,069 $ 1,164 $ 5,647 $ 4,242