BUSINESS SEGMENTS Our operations are organized into three segments: potash, Trio  and oilfield solutions. The reportable segments are determined by management based on several factors including the types of products and services sold, production processes, markets served and the financial information available for our chief operating decision maker. We evaluate performance based on the gross margins of the respective business segments and do not allocate corporate selling and administrative expenses, among others, to the respective segments. Intersegment sales prices are market-based and are eliminated in the "Other" column. Information for each segment is provided in the tables that follow (in thousands). Three Months Ended June 30, 2020 Potash Trio  Oilfield Solutions Other Consolidated Sales $ 24,526 $ 19,251 $ 2,747 $ (74) $ 46,450 Less: Freight costs 3,286 5,523  (74) 8,735 Warehousing and handling costs 1,204 861   2,065 Cost of goods sold 17,650 14,222 2,136  34,008 Lower of cost or net realizable value inventory adjustments 371 1,870   2,241 Gross Margin (Deficit) $ 2,015 $ (3,225) $ 611 $  $ (599) Depreciation, depletion, and amortization incurred 1 $ 5,742 $ 1,516 $ 657 $ 209 $ 8,124 Six Months Ended June 30, 2020 Potash Trio  Oilfield Solutions Other Consolidated Sales $ 58,317 $ 41,832 $ 10,488 $ (203) $ 110,434 Less: Freight costs 8,727 12,071  (203) 20,595 Warehousing and handling costs 2,500 2,469   4,969 Cost of goods sold 40,370 31,652 5,033  77,055 Lower of cost or net realizable value inventory adjustments 371 2,420   2,791 Gross Margin (Deficit) $ 6,349 $ (6,780) $ 5,455 $  $ 5,024 Depreciation, depletion, and amortization incurred 1 $ 13,054 $ 3,025 $ 1,289 $ 422 $ 17,790 Three Months Ended June 30, 2019 Potash Trio  Oilfield Solutions Other Consolidated Sales $ 35,547 $ 21,435 $ 5,641 $ (111) $ 62,512 Less: Freight costs 4,742 6,471 80  11,293 Warehousing and handling costs 1,319 911   2,230 Cost of goods sold 21,258 12,599 2,072 (111) 35,818 Gross Margin $ 8,228 $ 1,454 $ 3,489 $  $ 13,171 Depreciation, depletion, and amortization incurred 1 $ 6,120 $ 1,520 $ 232 $ 201 $ 8,073 Six Months Ended June 30, 2019 Potash Trio  Oilfield Solutions Other Consolidated Sales $ 69,877 $ 39,245 $ 12,263 $ (1,319) $ 120,066 Less: Freight costs 9,382 11,506 861  21,749 Warehousing and handling costs 2,586 1,880   4,466 Cost of goods sold 40,317 23,673 4,841 (1,319) 67,512 Gross Margin $ 17,592 $ 2,186 $ 6,561 $  $ 26,339 Depreciation, depletion and amortization incurred 1 $ 12,915 $ 3,078 $ 423 $ 403 $ 16,819 1 Depreciation, depletion, and amortization incurred for potash and Trio  excludes depreciation, depletion and amortization amounts absorbed in or relieved from inventory.