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Comprehensive Income and Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Components of Other Comprehensive Income (Loss), Net of Tax | The accumulated balances related to each component of other comprehensive income (loss), net of tax, are as follows:
| Foreign Currency Translation Component |  | Pension and Other Postretirement Benefit Plans |  | Accumulated Other Comprehensive Income (Loss)
|  |  | (In thousands) |  |
Balance at December 31, 2015 | $ | (23,411 | ) |  | $ | (35,576 | ) |  | $ | (58,987 | )
Other comprehensive gain (loss) loss attributable to Belden before reclassifications | 18,750 |  |  | (5,166 | ) |  | 13,584 |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 6,336 |  |  | 6,336 |
Net current period other comprehensive gain attributable to Belden | 18,750 |  |  | 1,170 |  |  | 19,920 |
Balance at December 31, 2016 | (4,661 | ) |  | (34,406 | ) |  | (39,067 | )
Other comprehensive gain (loss) attributable to Belden before reclassifications | (65,030 | ) |  | 4,504 |  |  | (60,526 | )
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 1,567 |  |  | 1,567 |
Net current period other comprehensive gain (loss) attributable to Belden | (65,030 | ) |  | 6,071 |  |  | (58,959 | )
Balance at December 31, 2017 | $ | (69,691 | ) |  | $ | (28,335 | ) |  | $ | (98,026 | )
Summary of Effects of Reclassifications from Accumulated Other Comprehensive Income (Loss) | The following table summarizes the effects of reclassifications from accumulated other comprehensive income (loss):
| Amount Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Affected Line Item in the Consolidated Statements of Operations and Comprehensive Income
| (In thousands) |  |
Amortization of pension and other postretirement benefit plan items: |  |  |
Settlement gain | $ | (8 | ) |  | (1 | )
Actuarial losses | 2,597 |  |  | (1 | )
Prior service credit | (41 | ) |  | (1 | )
Total before tax | 2,548 |  |  |
Tax benefit | (981 | ) |  |
Total net of tax | $ | 1,567 |  |  |
(1) | The amortization of these accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit costs (see Note 16).

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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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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