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Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 1,387,588 | $ 1,434,866
Ending balance | 965,819 | 1,387,588
Foreign Currency Translation Component |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (41,882) | (69,691)
Other comprehensive gain (loss) loss attributable to Belden before reclassifications | 23,657 | 27,809
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0
Net current period other comprehensive gain (loss) attributable to Belden | 23,657 | 27,809
Ending balance | (18,225) | (41,882)
Pension and Other Postretirement Benefit Plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (33,025) | (28,335)
Other comprehensive gain (loss) loss attributable to Belden before reclassifications | (13,281) | (7,813)
Amounts reclassified from accumulated other comprehensive income (loss) | 1,113 | 3,123
Net current period other comprehensive gain (loss) attributable to Belden | (12,168) | (4,690)
Ending balance | (45,193) | (33,025)
Accumulated Other Comprehensive Income (Loss) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (74,907) | (98,026)
Other comprehensive gain (loss) loss attributable to Belden before reclassifications | 10,376 | 19,996
Amounts reclassified from accumulated other comprehensive income (loss) | 1,113 | 3,123
Net current period other comprehensive gain (loss) attributable to Belden | 11,489 | 23,119
Ending balance | $ (63,418) | $ (74,907)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + Details
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