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BUSINESS SEGMENTS - Segment Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) segment | Sep. 30, 2018 USD ($)
Segment information |  |  |  |
Number of segments | segment |  |  | 2 |
Net sales | $ 100,094 | $ 87,883 | $ 311,183 | $ 236,111
Segment operating income | 12,821 | 8,820 | 57,926 | 24,361
Other income (expense), net | 170 | (335) | 492 | (1,039)
Interest expense, net | (387) | (495) | (1,169) | (1,096)
Income before income taxes | 12,604 | 7,990 | 57,249 | 22,226
Operating Segments |  |  |  |
Segment information |  |  |  |
Segment operating income | 17,130 | 11,959 | 70,806 | 34,592
Segment depreciation and amortization | 2,617 | 2,397 | 7,367 | 7,164
Segment Reconciling Items |  |  |  |
Segment information |  |  |  |
Unallocated corporate expenses | (3,067) | (2,269) | (8,972) | (7,569)
Stock-based compensation | (1,242) | (870) | (3,908) | (2,662)
Other income (expense), net | 170 | (335) | 492 | (1,039)
Interest expense, net | (387) | (495) | (1,169) | (1,096)
DynaEnergetics |  |  |  |
Segment information |  |  |  |
Net sales | 77,356 | 66,250 | 245,820 | 174,270
DynaEnergetics | Operating Segments |  |  |  |
Segment information |  |  |  |
Segment operating income | 14,911 | 9,860 | 64,834 | 30,801
Segment depreciation and amortization | 1,772 | 1,595 | 4,890 | 4,729
NobelClad |  |  |  |
Segment information |  |  |  |
Net sales | 22,738 | 21,633 | 65,363 | 61,841
NobelClad | Operating Segments |  |  |  |
Segment information |  |  |  |
Segment operating income | 2,219 | 2,099 | 5,972 | 3,791
Segment depreciation and amortization | $ 845 | $ 802 | $ 2,477 | $ 2,435

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