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BUSINESS SEGMENTS - Segment Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) segment | Jun. 30, 2019 USD ($)
Segment information |  |  |  |
Number of segments | segment |  |  | 2 |
Net sales | $ 43,203 | $ 110,954 | $ 116,766 | $ 211,089
Segment operating (loss) income | (7,990) | 24,653 | (1,645) | 45,105
Other (expense) income, net | (85) | 343 | 32 | 322
Interest expense, net | (156) | (409) | (394) | (782)
(Loss) income before income taxes | (8,231) | 24,587 | (2,007) | 44,645
Depreciation and amortization | 2,717 | 2,554 | 5,423 | 4,750
Operating Segments |  |  |  |
Segment information |  |  |  |
Segment operating (loss) income | (4,910) | 28,736 | 5,170 | 53,676
Depreciation and amortization | 2,653 | 2,554 | 5,259 | 4,750
Segment Reconciling Items |  |  |  |
Segment information |  |  |  |
Unallocated corporate expenses | (1,639) | (2,588) | (4,256) | (5,905)
Stock-based compensation | (1,441) | (1,495) | (2,559) | (2,666)
Other (expense) income, net | (85) | 343 | 32 | 322
Interest expense, net | (156) | (409) | (394) | (782)
Corporate and other |  |  |  |
Segment information |  |  |  |
Depreciation and amortization | 64 | 0 | 164 | 0
DynaEnergetics |  |  |  |
Segment information |  |  |  |
Net sales | 23,643 | 88,628 | 76,863 | 168,464
DynaEnergetics | Operating Segments |  |  |  |
Segment information |  |  |  |
Segment operating (loss) income | (6,895) | 26,813 | 1,711 | 49,923
Depreciation and amortization | 1,772 | 1,719 | 3,544 | 3,118
NobelClad |  |  |  |
Segment information |  |  |  |
Net sales | 19,560 | 22,326 | 39,903 | 42,625
NobelClad | Operating Segments |  |  |  |
Segment information |  |  |  |
Segment operating (loss) income | 1,985 | 1,923 | 3,459 | 3,753
Depreciation and amortization | $ 881 | $ 835 | $ 1,715 | $ 1,632

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