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OPERATING SEGMENT REPORTING - Capital Expenditures (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Segment Reporting |  |  |
Capital Expenditures | $ 79,396 | $ 11,511 | $ 6,165
Mexico |  |  |
Operating Segment Reporting |  |  |
Capital Expenditures | (3,107) | 939 | 5,401
Canada |  |  |
Operating Segment Reporting |  |  |
Capital Expenditures | (1,110) | 4,301 |
U.S. |  |  |
Operating Segment Reporting |  |  |
Capital Expenditures | $ 83,613 | $ 6,271 | $ 764

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Includes the cash outflow from the purchase of mining and mining related assets during the period. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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