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Note 13 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Cash flows from operating activities | $ 115,892 | $ 63,609
Additions to properties, plants, equipment and mineral interests | (54,382) | (97,338)
Other investing activities, net | (1,356) | 1,457
Dividends paid to shareholders | (4,365) | (4,070)
Borrowings on debt | 707,107 | 245,000
Payments on debt | (720,746) | (200,484)
Other financing activity, net | (4,032) | (2,825)
Effect of exchange rates on cash | (1,873) | 257
Changes in cash, cash equivalents and restricted cash and cash equivalents | 36,245 | 5,606
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period | 63,477 | 28,414
Cash, cash equivalents and restricted cash and cash equivalents at end of period | 99,722 | 34,020
Acquisitions of other companies, net of cash acquired |  | 0
Reportable Legal Entities [Member] | Parent Company [Member] |  |
Cash flows from operating activities | 47,945 | (140,110)
Additions to properties, plants, equipment and mineral interests | 0 | 0
Other investing activities, net | (28,657) | 72,128
Dividends paid to shareholders | (4,365) | (4,070)
Borrowings on debt | 707,107 | 245,000
Payments on debt | (716,500) | (195,000)
Other financing activity, net | 15,706 | 34,769
Effect of exchange rates on cash | 0 | 0
Changes in cash, cash equivalents and restricted cash and cash equivalents | 21,236 | 12,717
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period | 33,750 | 6,266
Cash, cash equivalents and restricted cash and cash equivalents at end of period | 54,986 | 18,983
Acquisitions of other companies, net of cash acquired |  | 0
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |
Cash flows from operating activities | 144,109 | 92,042
Additions to properties, plants, equipment and mineral interests | (53,846) | (56,329)
Other investing activities, net | 262 | 42
Dividends paid to shareholders | 0 | 0
Borrowings on debt | 0 | 0
Payments on debt | (4,246) | (4,965)
Other financing activity, net | (73,632) | (38,672)
Effect of exchange rates on cash | (796) | 257
Changes in cash, cash equivalents and restricted cash and cash equivalents | 11,851 | (7,625)
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period | 16,382 | 18,258
Cash, cash equivalents and restricted cash and cash equivalents at end of period | 28,233 | 10,633
Acquisitions of other companies, net of cash acquired |  |
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |
Cash flows from operating activities | 23,494 | (15,242)
Additions to properties, plants, equipment and mineral interests | (536) | (41,009)
Other investing activities, net | (1,617) | 1,415
Dividends paid to shareholders | 0 | 0
Borrowings on debt | 0 | 0
Payments on debt | 0 | (519)
Other financing activity, net | (17,106) | 55,869
Effect of exchange rates on cash | (1,077) | 0
Changes in cash, cash equivalents and restricted cash and cash equivalents | 3,158 | 514
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period | 13,345 | 3,890
Cash, cash equivalents and restricted cash and cash equivalents at end of period | 16,503 | 4,404
Acquisitions of other companies, net of cash acquired |  | 0
Consolidation, Eliminations [Member] |  |
Cash flows from operating activities | (99,656) | 126,919
Additions to properties, plants, equipment and mineral interests | 0 | 0
Other investing activities, net | 28,656 | (72,128)
Dividends paid to shareholders | 0 | 0
Borrowings on debt | 0 | 0
Payments on debt | 0 | 0
Other financing activity, net | 71,000 | (54,791)
Effect of exchange rates on cash | 0 | 0
Changes in cash, cash equivalents and restricted cash and cash equivalents | 0 | 0
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period | 0 | 0
Cash, cash equivalents and restricted cash and cash equivalents at end of period | $ 0 | 0
Acquisitions of other companies, net of cash acquired |  | $ 0

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121583591&loc=SL98516268-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 + Details
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