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Accumulated Other Comprehensive Loss Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income (loss) before income taxes |  | $ 21,381 | $ (11,564) | $ 184,146
Tax expense |  | 6,911 | (242) | 61,501
Net income (loss) |  | 14,470 | (11,322) | 122,645
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income (loss) | [1] | (347) | (40,532) | (339)
Amortization of prior-service cost | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of prior-service cost | [1],[2] | (354) | (543) | (543)
Income (loss) before income taxes | [1] | (354) | (543) | (543)
Tax expense |  | 133 | 204 | 204
Net income (loss) | [1] | (221) | (339) | $ (339)
Recognition of gain on sale of investment | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Recognition of gain on sale of investment | [2],[3] | (200) |  |
Income (loss) before income taxes | [3] | (200) |  |
Tax expense |  | 74 |  |
Net income (loss) | [3] | $ (126) |  |
Settlement of defined benefit pension plan | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of prior-service cost | [3] |  | 64,939 |
Income (loss) before income taxes | [3] |  | (64,939) |
Tax expense |  |  | 24,746 |
Net income (loss) | [3] |  | $ (40,193) |
[1] | Amounts in parentheses indicate debits to profit/loss
[2] | This accumulated other comprehensive income component is included in the computation of net periodic benefit cost (see Note 7. Employee Benefit Plans footnote for additional details)
[3] | All amounts are net of tax. Amounts in parentheses indicate debits

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (b)(7) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20187-122688 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51673353&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 2: 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.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 + Details
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