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Accounting Policies - Accumulated Other Comprehensive Loss by Component, Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 2,828,532 |
Ending balance | 2,988,229 |
Foreign currency translation |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 5,063 | $ (321,033)
Other comprehensive income (loss) before reclassifications | 77,967 | 49,395
Amounts reclassified from accumulated other comprehensive income | 0 | 0
Net current period other comprehensive income (loss) | 77,967 | 49,395
Ending balance | 83,030 | (271,638)
Derivative contracts |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 4,015 | (2,957)
Other comprehensive income (loss) before reclassifications | 920 | 903
Amounts reclassified from accumulated other comprehensive income | 448 | 426
Net current period other comprehensive income (loss) | 1,368 | 1,329
Ending balance | 5,383 | (1,628)
Pension and post retirement benefit plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (54,070) | (55,615)
Other comprehensive income (loss) before reclassifications | (847) | (3,363)
Amounts reclassified from accumulated other comprehensive income | 520 | 592
Net current period other comprehensive income (loss) | (327) | (2,771)
Ending balance | (54,397) | (58,386)
AOCI Attributable to Parent |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (44,992) | (379,605)
Other comprehensive income (loss) before reclassifications | 78,040 | 46,935
Amounts reclassified from accumulated other comprehensive income | 968 | 1,018
Net current period other comprehensive income (loss) | 79,008 | 47,953
Ending balance | $ 34,016 | $ (331,652)

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- Definition Amount after tax, before 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 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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