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Accumulated Other Comprehensive Income - Pre-tax and After-tax Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
After-tax amount |  |
Pre-tax amount | $ 13,002 | $ 14,191
Tax benefit/(expense) | (2,166) | (804)
Total other comprehensive income | 10,836 | 13,387
Defined benefit and other postretirement plans |  |
After-tax amount |  |
Pre-tax amount | (24) | (194)
Tax benefit/(expense) | 6 | 13
Total other comprehensive income | (18) | (181)
Net gain (loss) from hedging activities |  |
After-tax amount |  |
Pre-tax amount | 2,912 | (2,862)
Tax benefit/(expense) | (729) | 1,093
Total other comprehensive income | 2,183 | (1,769)
Foreign currency translation |  |
After-tax amount |  |
Pre-tax amount | 10,114 | 17,247
Tax benefit/(expense) | (1,443) | (1,910)
Total other comprehensive income | $ 8,671 | $ 15,337

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- Definition Amount before tax, after reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669625-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33775-111570 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669619-108580 + Details
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