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Guarantees, Other Contingent Liabilities, And Other Matters (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2017 | Jan. 09, 2017
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items] |  |  |  |
Face amount of guarantee including unpaid accrued interest | $ 36,000 | $ 35,000 | $ 17,000 |
Fair value of the guarantees | 1,149 | 1,844 | 1,177 |
Other contingent liabilities | 2,000 |  |  |
Net provision for losses (recoveries) on advances and guaranteed loans to suppliers | 4,375 | 414 |  |
Dividends paid on convertible perpetual preferred stock | 0 | 11,061 |  |
Repurchase of stock, retained earnings | (9,849) | $ 0 |  |
Series B 6.75% Convertible Perpetual Preferred Stock [Member] |  |  |  |
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items] |  |  |  |
Preferred stock, shares converted to common stock |  | 111,072 |  |
Percentage of outstanding convertible perpetual preferred stock converted |  | 50.80% |  |
Non-cash reclassification of preferred stock converted |  | $ 107,600 |  |
Preferred stock, shares outstanding |  |  |  | 107,418
Payments for repurchase of convertible perpetual preferred stock |  |  | 178,400 |
Dividends paid on convertible perpetual preferred stock |  |  | 15,000 |
Repurchase of stock, retained earnings |  |  | 74,400 |
Common Stock [Member] |  |  |  |
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items] |  |  |  |
Conversion of Stock, Shares Issued |  | 2,487,118 |  |
Advances to suppliers [Member] |  |  |  |
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items] |  |  |  |
Advances to suppliers current and non-current | 136,000 | $ 125,000 | 134,000 |
Valuation Allowances and Reserves, Balance | 24,000 | 30,000 | 27,000 |
Recoverable value added tax credits [Member] |  |  |  |
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items] |  |  |  |
Aggregate balance of recoverable value added tax credits | 52,000 | 41,000 | 45,000 |
Valuation Allowances and Reserves, Balance | 17,000 | $ 11,000 | $ 13,000 |
Santa Catarina [Member] |  |  |  |
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items] |  |  |  |
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits | 15,000 |  |  |
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits | 15,000 |  |  |
Santa Catarina [Member] | Minimum [Member] |  |  |  |
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items] |  |  |  |
Estimate of possible loss on remaining VAT audit assessment | 0 |  |  |
Santa Catarina [Member] | Maximum [Member] |  |  |  |
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items] |  |  |  |
Estimate of possible loss on remaining VAT audit assessment | 15,000 |  |  |
Parana [Member] |  |  |  |
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items] |  |  |  |
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits | 17,000 |  |  |
Reduced Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits | 5,000 |  |  |
Parana [Member] | Minimum [Member] |  |  |  |
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items] |  |  |  |
Estimate of possible loss on remaining VAT audit assessment | 0 |  |  |
Parana [Member] | Maximum [Member] |  |  |  |
Guarantees, Other Contingent Liabilities, and Other Matters [Line Items] |  |  |  |
Estimate of possible loss on remaining VAT audit assessment | $ 5,000 |  |  |

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- Definition The value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12201-110248 + Details
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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 + Details
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- Definition The cash outflow to reacquire callable preferred stock which is identified as being convertible to another type of financial security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Guarantee Face Amount Including Unpaid Accrued interest + References No definition available. + Details
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- Definition [Line Items] for Guarantees, Other Contingent Liabilities, and Other Matters [Table] + References No definition available. + Details
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- Definition Percentage of outstanding convertible perpetual preferred stock that were converted to common stock + References No definition available. + Details
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- Definition Reduction of Brazil Audit Assessment For Tax, Penalties, And Interest On Recoverable Value Added Tax Credits + References No definition available. + Details
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- Definition Stock repurchased and retired during period value retained earnings. + References No definition available. + Details
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