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Reportable Segments - Reconciliation of Net Loss to Adjusted EBITA (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information |  |  |  |
Net income (loss) attributable to PQ Group Holdings Inc. | $ 14,185 | $ (3,345) | $ 30,181 | $ (7,408)
Provision for income taxes | 8,470 | 5,172 | 21,590 | 5,269
Interest expense, net | 28,238 | 49,079 | 84,622 | 144,041
Depreciation and amortization | 43,827 | 45,929 | 139,298 | 129,135
Segment EBITDA | 94,720 | 96,835 | 275,691 | 271,037
Debt extinguishment costs | 864 | 453 | 6,743 | 453
Losses on disposal of fixed assets | 5,202 | 3,494 | 11,106 | 6,419
Foreign currency exchange loss |  |  | 15,347 | 21,612
Management advisory fees | 0 | 1,250 | 0 | 3,750
Transaction and other related costs | 215 | 966 | 827 | 5,295
Corporate, non-segment |  |  |  |
Segment Reporting Information |  |  |  |
Unallocated corporate expenses | 10,276 | 7,885 | 27,322 | 23,474
Segment reconciling items |  |  |  |
Segment Reporting Information |  |  |  |
Joint venture depreciation, amortization, and interest | 3,292 | 2,563 | 9,214 | 8,073
Investment in affiliate and inventory step-up amortization | 1,658 | 1,658 | 4,975 | 6,941
Amortization of inventory step-up | 0 | 0 | 1,603 | 871
Debt extinguishment costs | 864 | 453 | 6,743 | 453
Losses on disposal of fixed assets | 5,202 | 3,494 | 11,106 | 6,419
Foreign currency exchange loss | 3,527 | 5,256 | 15,347 | 21,612
LIFO expense | 856 | 750 | 5,903 | 3,229
Management advisory fees | 0 | 1,250 | 0 | 3,750
Transaction and other related costs | 210 | 966 | 895 | 5,300
Equity-based and other non-cash compensation | 4,252 | 1,041 | 11,879 | 3,869
Restructuring, integration and business optimization expenses | 2,178 | 4,957 | 5,662 | 8,009
Defined benefit pension plan cost | 112 | 791 | 260 | 2,200
Other | 1,250 | (114) | 5,623 | 2,082
Operating segments |  |  |  |
Segment Reporting Information |  |  |  |
Segment Adjusted EBITDA | $ 128,397 | $ 127,785 | $ 382,223 | $ 367,319

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