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Long-term Debt (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] |
| December 31,
Dollar amounts in millions | 2018 |  | 2017
| Interest Rate |  | Principal |  | Unamortized Debt Costs |  | Total |  | Principal |  | Unamortized Debt Costs |  | Total
Debentures: |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, maturing 2024, interest rates fixed | 4.875 | % |  | $ | 350.0 |  |  | $ | (3.7 | ) |  | $ | 346.3 |  |  | $ | 350.0 |  |  | $ | (4.4 | ) |  | $ | 345.6 |
Bank credit facilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Chilean term credit facility, maturing 2019, interest rates fixed | UF+3.9% |  |  | 4.7 |  |  | (0.1 | ) |  | 4.6 |  |  | 7.7 |  |  | (0.1 | ) |  | 7.6 |
Limited recourse notes payable: |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, payable matured 2018, interest rates fixed | 7.3 | % |  | — |  |  | — |  |  | — |  |  | 22.0 |  |  | — |  |  | 22.0 |
Other financing: |  |  |  |  |  |  |  |  |  |  |  |  |
Capital leases |  |  | 1.0 |  |  | — |  |  | 1.0 |  |  | 0.7 |  |  | — |  |  | 0.7 |
Total |  |  | 355.7 |  |  | (3.8 | ) |  | 351.9 |  |  | 380.4 |  |  | (4.5 | ) |  | 375.9 |
Less: current portion |  |  | (5.0 | ) |  | — |  |  | (5.0 | ) |  | (25.1 | ) |  | — |  |  | (25.1 | )
Net long-term portion |  |  | $ | 350.7 |  |  | $ | (3.8 | ) |  | $ | 346.9 |  |  | $ | 355.3 |  |  | $ | (4.5 | ) |  | $ | 350.8 |
Schedule of Maturities of Long-term Debt [Table Text Block] | The weighted average interest rate for all long-term debt at December 31, 2018 and 2017 was approximately 4.9% and 5.1% . Required repayment of principal for long-term debt is as follows:
Dollar amounts in millions |
Years ending December 31, |
2019 | $ | 5.2 |
2020 | 0.2 |
2021 | 0.2 |
2022 | 0.1 |
2023 | — |
2024 and after | 350.0 |
Total | $ | 355.7 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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