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Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Statement of Comprehensive Income [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax | $ 0 | $ 251 | $ 0 | $ 481
Net income (loss) | (34,200) | 8,274 | (1,314) | 56,180
Other comprehensive income (loss): |  |  |  |
Foreign currency translation adjustment | (2,666) | 7,143 | (11,571) | 9,817
Derivative financial instruments adjustment | (1,701) | 326 | (2,891) | 288
Amortization of prior service costs and net gains or losses | 2,703 | 1,854 | 7,926 | 5,754
Other comprehensive income (loss) | (1,664) | 9,323 | (6,536) | 15,859
Comprehensive income (loss) | (35,864) | 17,597 | (7,850) | 72,039
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax | (336) | 186 | (316) | 162
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | $ 789 | $ 1,057 | $ 2,312 | $ 3,279

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e557-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 + Details
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