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Investments in and Advances to Affiliates (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Investments in and Advances to Affiliates [Line Items] |  |
Total Investments | $ 13,320 | $ 2,675
CSI Compressco |  |
Investments in and Advances to Affiliates [Line Items] |  |
Ownership percentage | 10.90% |
Total Investments | $ 9,533 | 0
Standard Lithium |  |
Investments in and Advances to Affiliates [Line Items] |  |
Total Investments | $ 3,787 | $ 2,675

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- Definition Value of the investment at close of period. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(3)) -URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611322-123010 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(2)) -URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611322-123010 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column E)) -URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611322-123010 + Details
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