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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Pension and postretirement benefits [Abstract] |  |  |  |
Amortization of net actuarial loss, Gross Amount | [1] | $ 4,763 | $ 6,963 | $ 68
Amortization of net actuarial loss, Income Tax (Provision) Benefit | [1] | (1,825) | (2,667) | (26)
Amortization of net actuarial loss, Net Amount | [1] | 2,938 | 4,296 | 42
Actuarial gains (losses), Gross Amount | [1] | (15,013) | 19,482 | (71,843)
Actuarial gains (losses), Income Tax (Provision) Benefit | [1] | 5,754 | (7,456) | 27,507
Actuarial gains (losses), Net Amount | [1] | (9,259) | 12,026 | (44,336)
Foreign currency translation adjustments, Gross Amount |  | 0 | 29 | (35)
Foreign currency translation adjustments, Income Tax (Provision) Benefit |  | 0 | 0 | 0
Foreign currency translation adjustments, Net Amount |  | 0 | 29 | (35)
Change in fair value of derivative instruments [Abstract] |  |  |  |
Unrealized gains (losses), Gross Amount | [2] | 0 | 0 | 24
Unrealized gains (losses), Income Tax (Provision) Benefit | [2] | 0 | 0 | (9)
Unrealized gains (losses), Net Amount | [2] | 0 | 0 | 15
Reclassified to net earnings, Gross Amount | [2] | 0 | 0 | 121
Reclassified to net earnings, Income Tax (Provision) Benefit | [2] | 0 | 0 | (51)
Reclassified to net earnings, Net Amount | [2] | 0 | 0 | 70
Total other comprehensive income, Gross Amount |  | (10,250) | 26,474 | (71,665)
Total other comprehensive income, Income Tax (Provision) Benefit |  | 3,929 | (10,123) | 27,421
Total other comprehensive income (loss), net of taxes |  | $ (6,321) | $ 16,351 | $ (44,244)
[1] | Actuarial gains (losses) are amortized into costs of sales and operating expenses or selling, general and administrative expenses as appropriate. (See Note 9 - Retirement Plans)
[2] | Reclassifications to net earnings of derivatives qualifying as effective hedges are recognized in costs of sales and operating expenses.

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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=65897934&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=66004124&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=65897934&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=66004124&loc=d3e637-108580 + Details
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