Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customers (Details)

v3.19.1
Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue    
Document Period End Date Mar. 31, 2019  
Sales $ 359,221 $ 366,197
Refining Services    
Disaggregation of Revenue    
Sales 104,957 99,902
Catalysts    
Disaggregation of Revenue    
Sales 15,590 16,473
Performance Materials    
Disaggregation of Revenue    
Sales 61,041 62,670
Performance Chemicals    
Disaggregation of Revenue    
Sales 177,633 187,152
Operating segments    
Disaggregation of Revenue    
Sales 363,261 369,892
Operating segments | Industrial & process chemicals    
Disaggregation of Revenue    
Sales 91,358 95,193
Operating segments | Fuels & emission control    
Disaggregation of Revenue    
Sales 57,690 55,997
Operating segments | Packaging & engineered plastics    
Disaggregation of Revenue    
Sales 60,391 60,051
Operating segments | Highway safety & construction    
Disaggregation of Revenue    
Sales 49,298 47,145
Operating segments | Consumer products    
Disaggregation of Revenue    
Sales 68,509 76,730
Operating segments | Natural resources    
Disaggregation of Revenue    
Sales 36,015 34,776
Operating segments | Refining Services    
Disaggregation of Revenue    
Sales 105,844 100,714
Operating segments | Refining Services | Industrial & process chemicals    
Disaggregation of Revenue    
Sales 18,402 17,039
Operating segments | Refining Services | Fuels & emission control    
Disaggregation of Revenue    
Sales 57,690 55,997
Operating segments | Refining Services | Packaging & engineered plastics    
Disaggregation of Revenue    
Sales 12,689 11,770
Operating segments | Refining Services | Highway safety & construction    
Disaggregation of Revenue    
Sales 0 0
Operating segments | Refining Services | Consumer products    
Disaggregation of Revenue    
Sales 0 0
Operating segments | Refining Services | Natural resources    
Disaggregation of Revenue    
Sales 17,063 15,908
Operating segments | Catalysts    
Disaggregation of Revenue    
Sales 15,866 16,473
Operating segments | Catalysts | Industrial & process chemicals    
Disaggregation of Revenue    
Sales 276 0
Operating segments | Catalysts | Fuels & emission control    
Disaggregation of Revenue    
Sales 0 0
Operating segments | Catalysts | Packaging & engineered plastics    
Disaggregation of Revenue    
Sales 15,590 16,473
Operating segments | Catalysts | Highway safety & construction    
Disaggregation of Revenue    
Sales 0 0
Operating segments | Catalysts | Consumer products    
Disaggregation of Revenue    
Sales 0 0
Operating segments | Catalysts | Natural resources    
Disaggregation of Revenue    
Sales 0 0
Operating segments | Performance Materials    
Disaggregation of Revenue    
Sales 61,089 62,742
Operating segments | Performance Materials | Industrial & process chemicals    
Disaggregation of Revenue    
Sales 13,028 12,518
Operating segments | Performance Materials | Fuels & emission control    
Disaggregation of Revenue    
Sales 0 0
Operating segments | Performance Materials | Packaging & engineered plastics    
Disaggregation of Revenue    
Sales 17,382 19,892
Operating segments | Performance Materials | Highway safety & construction    
Disaggregation of Revenue    
Sales 27,360 26,659
Operating segments | Performance Materials | Consumer products    
Disaggregation of Revenue    
Sales 0 0
Operating segments | Performance Materials | Natural resources    
Disaggregation of Revenue    
Sales 3,319 3,673
Operating segments | Performance Chemicals    
Disaggregation of Revenue    
Sales 180,462 189,963
Operating segments | Performance Chemicals | Industrial & process chemicals    
Disaggregation of Revenue    
Sales 59,652 65,636
Operating segments | Performance Chemicals | Fuels & emission control    
Disaggregation of Revenue    
Sales 0 0
Operating segments | Performance Chemicals | Packaging & engineered plastics    
Disaggregation of Revenue    
Sales 14,730 11,916
Operating segments | Performance Chemicals | Highway safety & construction    
Disaggregation of Revenue    
Sales 21,938 20,486
Operating segments | Performance Chemicals | Consumer products    
Disaggregation of Revenue    
Sales 68,509 76,730
Operating segments | Performance Chemicals | Natural resources    
Disaggregation of Revenue    
Sales 15,633 15,195
Inter-segment sales eliminations    
Disaggregation of Revenue    
Sales (4,040) (3,695)
Inter-segment sales eliminations | Refining Services    
Disaggregation of Revenue    
Sales (887) (812)
Inter-segment sales eliminations | Catalysts    
Disaggregation of Revenue    
Sales (276) 0
Inter-segment sales eliminations | Performance Materials    
Disaggregation of Revenue    
Sales (48) (72)
Inter-segment sales eliminations | Performance Chemicals    
Disaggregation of Revenue    
Sales $ (2,829) $ (2,811)