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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Summary of components of accumulated other comprehensive loss, net of tax | The following summary sets forth the components of accumulated other comprehensive loss, net of tax:
|  | Currency Translation Adjustments and Other |  | Net Actuarial Loss (1) |  | Prior Service Credit (1) |  | Accumulated Other Comprehensive Loss
|  | (In thousands)
January 1, 2015 |  | $ | (36,087 | ) |  | (585,941 | ) |  | 1,758 |  |  | (620,270 | )
Amortization |  | — |  |  | 19,505 |  |  | (1,411 | ) |  | 18,094 |
Other current period change |  | (99,933 | ) |  | (10,557 | ) |  | (69 | ) |  | (110,559 | )
December 31, 2015 |  | (136,020 | ) |  | (576,993 | ) |  | 278 |  |  | (712,735 | )
Amortization |  | — |  |  | 18,876 |  |  | 165 |  |  | 19,041 |
Other current period change |  | (70,590 | ) |  | (62,175 | ) |  | (7,573 | ) |  | (140,338 | )
December 31, 2016 |  | (206,610 | ) |  | (620,292 | ) |  | (7,130 | ) |  | (834,032 | )
Amortization |  | — |  |  | 20,267 |  |  | 219 |  |  | 20,486 |
Other current period change |  | 66,172 |  |  | 39,872 |  |  | 1 |  |  | 106,045 |
December 31, 2017 |  | $ | (140,438 | ) |  | (560,153 | ) |  | (6,910 | ) |  | (707,501 | )
_______________________
(1) | These amounts are included in the computation of net periodic pension cost and pension settlement charge. See Note 22, "Employee Benefit Plans," for further information.

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- Definition Tabular disclosure of the components of accumulated 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 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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