Comprehensive Income and Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

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).