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Reportable Segments - Capital Expenditures (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets |  |  |
Capital expenditure | $ 60,045 | $ 54,837 | $ 55,252
Operating segments | Ecoservices |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Capital expenditures gross | 43,561 | 31,799 | 42,310
Operating segments | Catalyst Technologies |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Capital expenditures gross | 15,997 | 11,177 | 8,984
Operating segments | Unallocated corporate expenses |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Capital expenditures gross | $ 487 | $ 11,861 | $ 3,958

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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