Belden (BDC) 10-Q 6 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Oct. 01, 2017	Nov. 02, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 1, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Trading Symbol	BDC
Entity Registrant Name	BELDEN INC.
Entity Central Index Key	913,142
Current Fiscal Year End Date	--12-31
Entity File Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		42,173,892

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 01, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 461,363	$ 848,116
Receivables, net	439,276	388,059
Inventories, net	262,494	190,408
Other current assets	67,048	29,176
Total assets held for sale	35,953	23,193
Total current assets	1,266,134	1,478,952
Property, plant and equipment, less accumulated depreciation	324,617	309,291
Goodwill	1,475,467	1,385,995
Intangible assets, less accumulated amortization	566,958	560,082
Deferred income taxes	35,565	33,706
Other long-lived assets	36,107	38,777
Total assets	3,704,848	3,806,803
Current liabilities:
Accounts payable	301,173	258,203
Accrued liabilities	257,729	310,340
Liabilities held for sale	1,732	1,736
Total current liabilities	560,634	570,279
Long-term debt	1,530,077	1,620,161
Postretirement benefits	112,938	104,050
Deferred income taxes	21,528	14,276
Other long-term liabilities	37,311	36,720
Stockholders’ equity:
Preferred stock	1	1
Common stock	503	503
Additional paid-in capital	1,123,623	1,116,090
Retained earnings	813,936	783,812
Accumulated other comprehensive loss	(84,342)	(39,067)
Treasury stock	(412,059)	(401,026)
Total Belden stockholders’ equity	1,441,662	1,460,313
Noncontrolling interest	698	1,004
Total stockholders’ equity	1,442,360	1,461,317
Total liabilities and stockholders' equity	$ 3,704,848	$ 3,806,803

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Income Statement [Abstract]
Revenues	$ 621,745	$ 601,109	$ 1,783,759	$ 1,744,237
Cost of sales	(381,921)	(355,147)	(1,079,312)	(1,025,027)
Gross profit	239,824	245,962	704,447	719,210
Selling, general and administrative expenses	(116,429)	(126,662)	(346,786)	(372,125)
Research and development	(35,442)	(33,512)	(105,108)	(106,297)
Amortization of intangibles	(27,162)	(23,808)	(77,944)	(75,603)
Operating income	60,791	61,980	174,609	165,185
Interest expense, net	(19,385)	(23,513)	(66,424)	(71,958)
Loss on debt extinguishment	(51,594)	0	(52,441)	0
Income (loss) before taxes	(10,188)	38,467	55,744	93,227
Income tax benefit (expense)	11,133	(2,395)	6,673	1,136
Net income	945	36,072	62,417	94,363
Less: Net loss attributable to noncontrolling interest	(82)	(88)	(274)	(286)
Net income attributable to Belden	1,027	36,160	62,691	94,649
Less: Preferred stock dividends	8,732	6,695	26,198	6,695
Net income (loss) attributable to Belden common stockholders	$ (7,705)	$ 29,465	$ 36,493	$ 87,954
Weighted average number of common shares and equivalents:
Basic (in shares)	42,256	42,126	42,251	42,073
Diluted (in shares)	42,256	42,648	42,663	42,534
Basic income per share attributable to Belden common stockholders (in usd per share)	$ (0.18)	$ 0.70	$ 0.86	$ 2.09
Diluted income per share attributable to Belden common stockholders (in usd per share)	$ (0.18)	$ 0.69	$ 0.86	$ 2.07
Comprehensive income (loss) attributable to Belden	$ (18,127)	$ 32,353	$ 17,416	$ 90,760
Common stock dividends declared per share (in usd per share)	$ 0.05	$ 0.05	$ 0.15	$ 0.15

Condensed Consolidated Cash Flo

Condensed Consolidated Cash Flow Statements (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016
Cash flows from operating activities:
Net income	$ 62,417	$ 94,363
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	112,538	110,857
Share-based compensation	13,431	13,943
Loss on debt extinguishment	52,441	0
Changes in operating assets and liabilities, net of the effects of currency exchange rate changes and acquired businesses:
Receivables	(32,950)	(9,843)
Inventories	(50,232)	5,626
Accounts payable	30,290	(3,889)
Accrued liabilities	(54,828)	(43,594)
Income taxes	(32,071)	(17,375)
Other assets	(9,046)	2,798
Other liabilities	11,625	(5,457)
Net cash provided by operating activities	103,615	147,429
Cash flows from investing activities:
Cash used to acquire businesses, net of cash acquired	(166,896)	(17,848)
Capital expenditures	(33,430)	(36,057)
Other	0	(971)
Proceeds from disposal of tangible assets	15	282
Net cash used for investing activities	(200,311)	(54,594)
Cash flows from financing activities:
Payments under borrowing arrangements	(1,105,892)	(51,875)
Cash dividends paid	(32,535)	(6,307)
Debt issuance costs paid	(16,586)	0
Payments under share repurchase program	(11,508)	0
Withholding tax payments for share-based payment awards, net of proceeds from the exercise of stock options	(5,421)	(5,302)
Proceeds from the issuance of preferred stock, net	0	501,498
Borrowings under credit arrangements	866,700	0
Net cash provided by (used for) financing activities	(305,242)	438,014
Effect of foreign currency exchange rate changes on cash and cash equivalents	15,185	705
Increase (decrease) in cash and cash equivalents	(386,753)	531,554
Cash and cash equivalents, beginning of period	848,116	216,751
Cash and cash equivalents, end of period	$ 461,363	$ 748,305

Condensed Consolidated Stockhol

Condensed Consolidated Stockholders' Equity Statement (Unaudited) - 9 months ended Oct. 01, 2017 - USD ($) shares in Thousands, $ in Thousands	Total	Mandatory Convertible Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interest
Beginning balance, shares at Dec. 31, 2016		52	50,335			(8,155)
Beginning balance at Dec. 31, 2016	$ 1,461,317	$ 1	$ 503	$ 1,116,090	$ 783,812	$ (401,026)	$ (39,067)	$ 1,004
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	62,417				62,691			(274)
Foreign currency translation, net of $1.5 million tax	(46,478)						(46,446)	(32)
Adjustments to pension and postretirement liability, net of $0.7 million tax	1,171						1,171
Other comprehensive loss, net of tax	(45,307)
Exercise of stock options, net of tax withholding forfeitures	(1,696)			(1,628)		$ (68)
Exercise of stock options, net of tax withholding forfeitures (in shares)						34
Conversion of restricted stock units into common stock, net of tax withholding forfeitures	$ (3,727)			(4,270)		$ 543
Conversion of restricted stock units into common stock, net of tax withholding forfeitures (in shares)						97
Share repurchase program (in shares)	(200)					(151)
Share repurchase program	$ (11,508)					$ (11,508)
Share-based compensation	13,431			13,431
Preferred stock dividends	(26,198)				(26,198)
Common stock dividends ($0.15 per share)	(6,369)				(6,369)
Ending balance, shares at Oct. 01, 2017		52	50,335			(8,175)
Ending balance at Oct. 01, 2017	$ 1,442,360	$ 1	$ 503	$ 1,123,623	$ 813,936	$ (412,059)	$ (84,342)	$ 698

Condensed Consolidated Stockho6

Condensed Consolidated Stockholders' Equity Statement (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Statement of Stockholders' Equity [Abstract]
Foreign currency translation, tax expense (benefit)	$ 1.1	$ 0.4	$ 1.5	$ 1.5
Adjustments to pension and postretirement liability, tax expense	$ 0.2	$ 3.1	$ 0.7	$ 3.7
Dividends declared per share (in usd per share)	$ 0.05	$ 0.05	$ 0.15	$ 0.15

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Oct. 01, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying Condensed Consolidated Financial Statements include Belden Inc. and all of its subsidiaries (the Company, us, we, or our). We eliminate all significant affiliate accounts and transactions in consolidation. The accompanying Condensed Consolidated Financial Statements presented as of any date other than December 31, 2016 : • Are prepared from the books and records without audit, and • Are prepared in accordance with the instructions for Form 10-Q and do not include all of the information required by accounting principles generally accepted in the United States for complete statements, but • Include all adjustments, consisting only of normal recurring adjustments, necessary for a fair presentation of the financial statements. These Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and Supplementary Data contained in our 2016 Annual Report on Form 10-K. Business Description We are a signal transmission solutions provider built around four global business platforms – Broadcast Solutions, Enterprise Solutions, Industrial Solutions, and Network Solutions. Our comprehensive portfolio of signal transmission solutions provides industry leading secure and reliable transmission of data, sound, and video for mission critical applications. Reporting Periods Our fiscal year and fiscal fourth quarter both end on December 31. Our fiscal first quarter ends on the Sunday falling closest to 91 days after December 31, which was April 2, 2017, the 92nd day of our fiscal year 2017. Our fiscal second and third quarters each have 91 days. The nine months ended October 1, 2017 and October 2, 2016 included 274 and 276 days, respectively. Reclassifications We have made certain reclassifications to the 2016 Condensed Consolidated Financial Statements for our segment change with no impact to reported net income in order to conform to the 2017 presentation. See Note 4. Operating Segments To leverage the Company's strengths in networking, IoT, and cybersecurity technologies, effective January 1, 2017, we formed a new segment called Network Solutions, which represents the combination of the prior Industrial IT Solutions and Network Security Solutions segments. The formation is a natural evolution in our organic and inorganic strategies for a range of industrial and non-industrial applications. We have revised the prior period segment information to conform to the change in the composition of these reportable segments. In connection with this change, we re-evaluated the useful life of the Tripwire trademark and concluded that an indefinite life is no longer appropriate. We have estimated a useful life of 10 years and will re-evaluate this estimate if and when our expected use of the Tripwire trademark changes. We began amortizing the Tripwire trademark in the first quarter of 2017, which resulted in amortization expense of $0.8 million and $2.4 million for the three and nine months ended October 1, 2017, respectively. Fair Value Measurement Accounting guidance for fair value measurements specifies a hierarchy of valuation techniques based upon whether the inputs to those valuation techniques reflect assumptions other market participants would use based upon market data obtained from independent sources or reflect our own assumptions of market participant valuation. The hierarchy is broken down into three levels based on the reliability of the inputs as follows: • Level 1 – Quoted prices in active markets that are unadjusted and accessible at the measurement date for identical, unrestricted assets or liabilities; • Level 2 – Quoted prices for identical assets and liabilities in markets that are not active, quoted prices for similar assets and liabilities in active markets, or financial instruments for which significant inputs are observable, either directly or indirectly; and • Level 3 – Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable. As of and during the three and nine months ended October 1, 2017 and October 2, 2016 , we utilized Level 1 inputs to determine the fair value of cash equivalents, and we utilized Level 2 and Level 3 inputs to determine the fair value of net assets acquired in business combinations (see Note 2). We did not have any transfers between Level 1 and Level 2 fair value measurements during the nine months ended October 1, 2017 and October 2, 2016 . Cash and Cash Equivalents We classify cash on hand and deposits in banks, including commercial paper, money market accounts, and other investments with an original maturity of three months or less, that we hold from time to time, as cash and cash equivalents. We periodically have cash equivalents consisting of short-term money market funds and other investments. The primary objective of our investment activities is to preserve our capital for the purpose of funding operations. We do not enter into investments for trading or speculative purposes. As of October 1, 2017 , we did not have any significant cash equivalents. Contingent Liabilities We have established liabilities for environmental and legal contingencies that are probable of occurrence and reasonably estimable, the amounts of which are currently not material. We accrue environmental remediation costs based on estimates of known environmental remediation exposures developed in consultation with our environmental consultants and legal counsel. We are, from time to time, subject to routine litigation incidental to our business. These lawsuits primarily involve claims for damages arising out of the use of our products, allegations of patent or trademark infringement, and litigation and administrative proceedings involving employment matters and commercial disputes. Based on facts currently available, we believe the disposition of the claims that are pending or asserted will not have a materially adverse effect on our financial position, results of operations, or cash flow. As of October 1, 2017 , we were party to standby letters of credit, surety bonds, and bank guaranties totaling $7.8 million , $2.4 million , and $2.0 million , respectively. Contingent Gain On July 5, 2011, our wholly-owned subsidiary, PPC Broadband, Inc. (PPC), filed an action for patent infringement against Corning Optical Communications RF LLC (Corning). The complaint alleged that Corning infringed two of PPC’s patents. In July 2015, a jury found that Corning willfully infringed both patents. In November 2016, following a series of post-trial motions, the trial judge issued rulings for a total judgment in our favor of approximately $61.3 million . In December 2016, Corning appealed the case to the U.S. Court of Appeals for the Federal Circuit, and that appeal remains pending. We have not recorded any amounts in our consolidated financial statements related to this matter due to the pendency of the appeal. Revenue Recognition We recognize revenue when all of the following circumstances are satisfied: (1) persuasive evidence of an arrangement exists, (2) price is fixed or determinable, (3) collectability is reasonably assured, and (4) delivery has occurred. Delivery occurs in the period in which the customer takes title and assumes the risks and rewards of ownership of the products specified in the customer’s purchase order or sales agreement. At times, we enter into arrangements that involve the delivery of multiple elements. For these arrangements, when the elements can be separated, the revenue is allocated to each deliverable based on that element’s relative selling price and recognized based on the period of delivery for each element. Generally, we determine relative selling price using vendor specific objective evidence (VSOE) of fair value. We record revenue net of estimated rebates, price allowances, invoicing adjustments, and product returns. We record revisions to these estimates in the period in which the facts that give rise to each revision become known. Taxes collected from customers and remitted to governmental authorities are not included in our revenues. We have certain products subject to the accounting guidance on software revenue recognition. For such products, software license revenue is recognized when persuasive evidence of an arrangement exists, delivery of the product has occurred, the fee is fixed or determinable, collection is probable and VSOE of the fair value of undelivered elements exists. As substantially all of the software licenses are sold in multiple-element arrangements that include either support and maintenance or both support and maintenance and professional services, we use the residual method to determine the amount of software license revenue to be recognized. Under the residual method, consideration is allocated to undelivered elements based upon VSOE of the fair value of those elements, with the residual of the arrangement fee allocated to and recognized as software license revenue. We have established VSOE of the fair value of support and maintenance, subscription-based software licenses, and professional services. Software license revenue is generally recognized upon delivery of the software if all revenue recognition criteria are met. Revenue allocated to support services under our support and maintenance contracts is typically paid in advance and recognized ratably over the term of the service. Revenue allocated to subscription-based software and remote ongoing operational services is also paid in advance and recognized ratably over the term of the service. Revenue allocated to professional services, including remote implementation services, is recognized as the services are performed. Subsequent Events We have evaluated subsequent events after the balance sheet date through the financial statement issuance date for appropriate accounting and disclosure. Pending Adoption of Recent Accounting Pronouncements In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (ASU 2014-09), which will replace most existing revenue recognition guidance in U.S. GAAP. The core principle of the ASU is that an entity should recognize revenue for the transfer of goods or services equal to the amount that it expects to be entitled to receive for those goods or services. ASU 2014-09 requires additional disclosure about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. We plan to adopt ASU 2014-09 on January 1, 2018, using the modified retrospective method of adoption. Our overall, initial assessment indicates that the impact of adopting ASU 2014-09 on our consolidated financial statements will not be material. We do not expect significant changes in the timing or method of revenue recognition for any of our material revenue streams. We are currently completing detailed contract reviews to determine if any adjustments are necessary to our existing accounting policies and to support our overall, initial assessment. We believe the most significant impact of adopting ASU 2014-09 will be on our disclosures regarding revenue recognition. We will continue our evaluation of ASU 2014-09, including new or emerging interpretations of the standard, through the date of adoption. In February 2016, the FASB issued Accounting Standards Update No. 2016-02, Leases (ASU 2016-02), a leasing standard for both lessees and lessors. Under its core principle, a lessee will recognize lease assets and liabilities on the balance sheet for all arrangements with terms longer than 12 months. Lessor accounting remains largely consistent with existing U.S. generally accepted accounting principles. The new standard will be effective for us beginning January 1, 2019. Early adoption is permitted. The standard requires the use of a modified retrospective transition method. We are evaluating the effect that ASU 2016-02 will have on our consolidated financial statements and related disclosures. In October 2016, the FASB issued Accounting Standards Update No. 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (ASU 2016-16), which requires recognition of the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. Consequently, the standard eliminates the exception to the recognition of current and deferred income taxes for an intra-entity asset transfer other than for inventory until the asset has been sold to an outside party. The new standard will be effective for us beginning January 1, 2018. Early adoption is permitted. We are evaluating the effect that ASU 2016-16 will have on our consolidated financial statements and related disclosures. In March 2017, the FASB issued Accounting Standards Update No. 2017-07, Compensation - Retirement Benefits: Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07), which requires an entity to report the service cost component in the same line item or items as other compensation costs arising from the service rendered by their employees during the period. The other components of net benefit cost are required to be presented in the Statement of Operations separately from the service cost component after Operating Income. Additionally, only the service cost component will be eligible for capitalization, when applicable. The standard requires the amendments to be applied retrospectively for the presentation of the service cost component and the other cost components of net periodic pension cost and net periodic OPEB cost in the Statement of Operations and prospectively, on and after the effective date, for the capitalization of the service cost component of net periodic pension and OPEB costs. The new standard will be effective for us beginning January 1, 2018. Early adoption is permitted. We are evaluating the effect that ASU 2017-07 will have on our consolidated financial statements and related disclosures.

Acquisitions

Acquisitions	9 Months Ended
	Oct. 01, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions Thinklogical Holdings, LLC We acquired 100% of the outstanding ownership interest in Thinklogical Holdings, LLC (Thinklogical) on May 31, 2017 for cash of $171.3 million . Thinklogical designs, manufactures, and markets high-bandwidth fiber matrix switches, video, and keyboard/video/mouse extender solutions, camera extenders, and console management solutions. Thinklogical is headquartered in Connecticut. The results of Thinklogical have been included in our Consolidated Financial Statements from May 31, 2017, and are reported within the Broadcast Solutions segment. The following table summarizes the estimated, preliminary fair value of the assets acquired and the liabilities assumed as of May 31, 2017 (in thousands): Cash $ 5,376 Receivables 4,355 Inventory 16,424 Prepaid and other current assets 320 Property, plant, and equipment 4,289 Intangible assets 76,400 Goodwill 68,394 Total assets acquired $ 175,558 Accounts payable $ 1,231 Accrued liabilities 1,353 Deferred revenue 1,702 Total liabilities assumed $ 4,286 Net assets $ 171,272 A single estimate of fair value results from a complex series of judgments about future events and uncertainties and relies heavily on estimates and assumptions. The judgments we have used in estimating the preliminary fair values assigned to each class of acquired assets and assumed liabilities could materially affect the results of our operations. The preliminary fair value of acquired receivables is $4.4 million , which is equivalent to its gross contractual amount. For purposes of the above allocation, we based our estimate of the preliminary fair value for the acquired inventory, intangible assets, and deferred revenue on a preliminary valuation study performed by a third party valuation firm. We have estimated a preliminary fair value adjustment for inventories based on the estimated selling price of the work-in-process and finished goods acquired at the closing date less the sum of the costs to complete the work-in-process, the costs of disposal, and a reasonable profit allowance for our post acquisition selling efforts. We used various valuation methods including discounted cash flows, lost income, excess earnings, and relief from royalty to estimate the preliminary fair value of the identifiable intangible assets and deferred revenue (Level 3 valuation). Goodwill and other intangible assets reflected above were determined to meet the criterion for recognition apart from tangible assets acquired and liabilities assumed. The goodwill is primarily attributable to expected synergies and the assembled workforce. The expected synergies for the Thinklogical acquisition primarily consist of utilizing Belden's fiber and connectivity portfolio with Thinklogical's connections between matrix switch, control systems, transmitters and source to expand our product portfolio across our segments to both existing and new customers. Our tax basis in the acquired goodwill is approximately $41.0 million and is deductible for tax purposes over a period of 15 years up to the amount of the tax basis. The intangible assets related to the acquisition consisted of the following: Fair Value Amortization Period (In thousands) (In years) Intangible assets subject to amortization: Developed technologies $ 65,200 10.0 Customer relationships 6,600 8.0 Trademarks 3,100 10.0 Sales backlog 1,500 0.3 Total intangible assets subject to amortization $ 76,400 Intangible assets not subject to amortization: Goodwill $ 68,394 n/a Total intangible assets not subject to amortization $ 68,394 Total intangible assets $ 144,794 Weighted average amortization period 9.6 The amortizable intangible assets reflected in the table above were determined by us to have finite lives. The useful life for the customer relationship intangible asset was based on our forecasts of estimated sales from recurring customers. The useful life for the trademarks was based on the period of time we expect to continue to go to market using the trademarks. The useful life for the developed technology intangible asset was based on the estimated time that the technology provides us with a competitive advantage and thus approximates the period and pattern of consumption of the intangible asset. The useful life of the backlog intangible asset was based on our estimate of when the ordered items would ship. Our consolidated revenues and consolidated loss before taxes for the three months ended October 1, 2017 included revenues of $11.6 million and a loss before taxes of $2.7 million , respectively, from Thinklogical. Our consolidated revenues and consolidated income before taxes for the nine months ended October 1, 2017 included revenues of $21.8 million and a loss before taxes of $1.7 million , respectively, from Thinklogical. The following table illustrates the unaudited pro forma effect on operating results as if the Thinklogical acquisition had been completed as of January 1, 2016. Three Months Ended Nine Months Ended October 1, 2017 October 2, 2016 October1, 2017 October 2, 2016 (In thousands, except per share data) (Unaudited) Revenues $ 621,745 $ 616,760 $ 1,792,614 $ 1,772,202 Net income (loss) attributable to Belden common stockholders (5,128 ) 34,564 37,097 85,588 Diluted income (loss) per share attributable to Belden common stockholders $ (0.12 ) $ 0.81 $ 0.87 $ 2.01 The above unaudited pro forma financial information is presented for informational purposes only and does not purport to represent what our results of operations would have been had we completed the acquisition on the date assumed, nor is it necessarily indicative of the results that may be expected in future periods. Pro forma adjustments exclude cost savings from any synergies resulting from the acquisition. M2FX We acquired 100% of the shares of M2FX Limited (M2FX) on January 7, 2016 for a purchase price of $19.0 million . M2FX is a manufacturer of fiber optic cable and fiber protective solutions for broadband access and telecommunications networks. M2FX is located in the United Kingdom. The results of M2FX have been included in our Consolidated Financial Statements from January 7, 2016, and are reported within the Broadcast Solutions segment. The M2FX acquisition was not material to our financial position or results of operations.

Assets Held for Sale

Assets Held for Sale	9 Months Ended
	Oct. 01, 2017
Discontinued Operations and Disposal Groups [Abstract]
Assets Held for Sale	Assets Held for Sale We classify assets and liabilities as held for sale (disposal group) when management, having the authority to approve the action, commits to a plan to sell the disposal group, the sale is probable within one year, and the disposal group is available for immediate sale in its present condition. We also consider whether an active program to locate a buyer has been initiated, whether the disposal group is marketed actively for sale at a price that is reasonable in relation to its current fair value, and whether actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. When we classify a disposal group as held for sale, we test for impairment. An impairment charge is recognized when the carrying value of the disposal group exceeds the estimated fair value, less costs to sell. We also cease depreciation and amortization for assets classified as held for sale. During the fourth quarter of 2016, we committed to a plan to sell our MCS business and Hirschmann JV and determined that we met all of the criteria to classify the assets and liabilities of these businesses as held for sale. The MCS business is part of the Industrial Solutions segment and the Hirschmann JV is an equity method investment that is not included in an operating segment. The MCS business operates in Germany and the United States, and the Hirschmann JV is an equity method investment located in China. During the fourth quarter of 2016, we reached an agreement in principle to sell this disposal group for a total sales price of $39 million . The carrying value of the disposal group exceeded the fair value less costs to sell, which we determined based on the expected sales price, by $23.9 million . Therefore, we recognized an impairment charge equal to this amount in the fourth quarter of 2016. During the first quarter of 2017, we signed a definitive sales agreement for a purchase price of $39 million , and we expect the sale to be completed in the fourth quarter of 2017. The following table provides the major classes of assets and liabilities classified as held for sale as of October 1, 2017 and December 31, 2016. In addition, the disposal group had $5.1 million and $15.7 million of accumulated other comprehensive losses at October 1, 2017 and December 31, 2016, respectively. October 1, 2017 December 31, 2016 (In thousands) Receivables, net $ 5,937 $ 4,551 Inventories, net 4,302 2,848 Other current assets 1,101 1,131 Property, plant, and equipment, less accumulated depreciation 2,348 1,946 Intangible assets, less accumulated amortization 4,589 4,405 Goodwill 5,477 5,477 Other long-lived assets 36,130 26,766 Total assets of disposal group 59,884 47,124 Impairment of assets held for sale (23,931 ) (23,931 ) Total assets held for sale $ 35,953 $ 23,193 Accrued liabilities $ 1,325 $ 1,288 Postretirement benefits 407 448 Total liabilities held for sale $ 1,732 $ 1,736

Operating Segments

Operating Segments	9 Months Ended
	Oct. 01, 2017
Segment Reporting [Abstract]
Operating Segments	Operating Segments We are organized around four global business platforms: Broadcast Solutions, Enterprise Solutions, Industrial Solutions, and Network Solutions. Each of the global business platforms represents a reportable segment. To leverage the Company's strengths in networking, IoT, and cybersecurity technologies, effective January 1, 2017, we formed a new segment called Network Solutions, which represents the combination of the prior Industrial IT Solutions and Network Security Solutions segments. The formation of this new segment is a natural evolution in our organic and inorganic strategies for a range of industrial and non-industrial applications. We have revised the prior period segment information to conform to the change in the composition of these reportable segments. This change had no impact to our reporting units for purposes of goodwill impairment testing. Beginning in 2017, sales of certain audio-visual cable that had previously been reported in our Broadcast Solutions segment are now reported in our Enterprise Solutions segment. As the annual revenues associated with this product line are not material, we have not revised the prior period segment information. The key measures of segment profit or loss reviewed by our chief operating decision maker are Segment Revenues and Segment EBITDA. Segment Revenues represent non-affiliate revenues and include revenues that would have otherwise been recorded by acquired businesses as independent entities but were not recognized in our Consolidated Statements of Operations due to the effects of purchase accounting and the associated write-down of acquired deferred revenue to fair value. Segment EBITDA excludes certain items, including depreciation expense; amortization of intangibles; asset impairment; severance, restructuring, and acquisition integration costs; purchase accounting effects related to acquisitions, such as the adjustment of acquired inventory and deferred revenue to fair value; and other costs. We allocate corporate expenses to the segments for purposes of measuring Segment EBITDA. Corporate expenses are allocated on the basis of each segment’s relative EBITDA prior to the allocation. Our measure of segment assets does not include cash, goodwill, intangible assets, deferred tax assets, or corporate assets. All goodwill is allocated to reporting units of our segments for purposes of impairment testing. Broadcast Solutions Enterprise Solutions Industrial Solutions Network Solutions Total Segments (In thousands) As of and for the three months ended October 1, 2017 Segment revenues $ 193,753 $ 167,089 $ 160,471 $ 100,432 $ 621,745 Affiliate revenues 129 1,419 332 — 1,880 Segment EBITDA 35,671 26,409 30,545 24,906 117,531 Depreciation expense 4,088 2,740 3,285 1,570 11,683 Amortization expense 13,482 438 646 12,596 27,162 Severance, restructuring, and acquisition integration costs 3,056 6,253 6,840 530 16,679 Purchase accounting effects of acquisitions 2,922 — — — 2,922 Segment assets 373,848 284,327 291,984 108,554 1,058,713 As of and for the three months ended October 2, 2016 Segment revenues $ 196,173 $ 156,658 $ 149,847 $ 99,790 $ 602,468 Affiliate revenues 46 1,587 511 13 2,157 Segment EBITDA 36,545 27,294 23,649 24,448 111,936 Depreciation expense 4,063 3,210 2,738 1,592 11,603 Amortization expense 10,955 431 604 11,818 23,808 Severance, restructuring, and acquisition integration costs 174 5,573 4,746 2,302 12,795 Deferred gross profit adjustments 283 — — 1,076 1,359 Segment assets 314,020 265,085 261,923 105,938 946,966 As of and for the nine months ended October 1, 2017 Segment revenues $ 550,420 $ 473,504 $ 465,907 $ 293,928 $ 1,783,759 Affiliate revenues 324 5,522 994 92 6,932 Segment EBITDA 90,681 77,310 87,314 65,563 320,868 Depreciation expense 12,095 8,034 9,659 4,806 34,594 Amortization expense 36,950 1,291 1,928 37,775 77,944 Severance, restructuring, and acquisition integration costs 4,434 19,267 8,307 831 32,839 Purchase accounting effects of acquisitions 4,089 — — — 4,089 Segment assets 373,848 284,327 291,984 108,554 1,058,713 As of and for the nine months ended October 2, 2016 Segment revenues $ 560,966 $ 452,951 $ 438,746 $ 296,986 $ 1,749,649 Affiliate revenues 644 4,615 906 44 6,209 Segment EBITDA 89,317 80,605 73,700 66,715 310,337 Depreciation expense 12,086 10,028 8,165 4,974 35,253 Amortization expense 37,306 1,292 1,796 35,209 75,603 Severance, restructuring, and acquisition integration costs 5,871 7,280 7,982 5,939 27,072 Purchase accounting effects of acquisitions 195 — — — 195 Deferred gross profit adjustments 1,391 — — 4,021 5,412 Segment assets 314,020 265,085 261,923 105,938 946,966 The following table is a reconciliation of the total of the reportable segments’ Revenues and EBITDA to consolidated revenues and consolidated income before taxes, respectively. Three Months Ended Nine Months Ended October 1, 2017 October 2, 2016 October 1, 2017 October 2, 2016 (In thousands) Total Segment Revenues $ 621,745 $ 602,468 $ 1,783,759 $ 1,749,649 Deferred revenue adjustments (1) — (1,359 ) — (5,412 ) Consolidated Revenues $ 621,745 $ 601,109 $ 1,783,759 $ 1,744,237 Total Segment EBITDA $ 117,531 $ 111,936 $ 320,868 $ 310,337 Amortization of intangibles (27,162 ) (23,808 ) (77,944 ) (75,603 ) Severance, restructuring, and acquisition integration costs (2) (16,679 ) (12,795 ) (32,839 ) (27,072 ) Depreciation expense (11,683 ) (11,603 ) (34,594 ) (35,253 ) Purchase accounting effects related to acquisitions (3) (2,922 ) — (4,089 ) (195 ) Deferred gross profit adjustments (1) — (1,359 ) — (5,412 ) Income from equity method investment 2,551 586 5,835 1,077 Eliminations (845 ) (977 ) (2,628 ) (2,694 ) Consolidated operating income 60,791 61,980 174,609 165,185 Interest expense, net (19,385 ) (23,513 ) (66,424 ) (71,958 ) Loss on debt extinguishment (51,594 ) — (52,441 ) — Consolidated income (loss) before taxes $ (10,188 ) $ 38,467 $ 55,744 $ 93,227 (1) For the three and nine months ended October 2, 2016 , our segment results include revenues that would have been recorded by acquired businesses had they remained as independent entities. Our consolidated results do not include these revenues due to the purchase accounting effect of recording deferred revenue at fair value. (2) See Note 8, Severance, Restructuring, and Acquisition Integration Activities, for details . (3) For the three and nine months ended October 1, 2017 and nine months ended October 2, 2016 , we recognized cost of sales for the adjustment of acquired inventory to fair value related to the Thinklogical and M2FX acquisitions, respectively.

Income per Share

Income per Share	9 Months Ended
	Oct. 01, 2017
Earnings Per Share [Abstract]
Income per Share	Income per Share The following table presents the basis for the income per share computations: Three Months Ended Nine Months Ended October 1, 2017 October 2, 2016 October 1, 2017 October 2, 2016 (In thousands) Numerator: Net income $ 945 $ 36,072 $ 62,417 $ 94,363 Less: Net loss attributable to noncontrolling interest (82 ) (88 ) (274 ) (286 ) Less: Preferred stock dividends 8,732 6,695 26,198 6,695 Net income (loss) attributable to Belden common stockholders $ (7,705 ) $ 29,465 $ 36,493 $ 87,954 Denominator: Weighted average shares outstanding, basic 42,256 42,126 42,251 42,073 Effect of dilutive common stock equivalents — 522 412 461 Weighted average shares outstanding, diluted 42,256 42,648 42,663 42,534 For the three and nine months ended October 1, 2017 , diluted weighted average shares outstanding do not include outstanding equity awards of 0.9 million and 0.5 million , respectively, because to do so would have been anti-dilutive. In addition, for both the three and nine months ended October 1, 2017 , diluted weighted average shares outstanding do not include outstanding equity awards of 0.2 million because the related performance conditions have not been satisfied. Furthermore, for the three and nine months ended October 1, 2017 , diluted weighted average shares outstanding do not include the impact of preferred shares that are convertible into 6.8 million and 6.9 million common shares, respectively, because deducting the preferred stock dividends from net income was more dilutive. For the three and nine months ended October 2, 2016 , diluted weighted average shares outstanding do not include outstanding equity awards of 0.4 million and 0.7 million , respectively, because to do so would have been anti-dilutive. In addition, for both the three and nine months ended October 2, 2016 , diluted weighted average shares outstanding do not include outstanding equity awards of 0.1 million because the related performance conditions have not been satisfied. Furthermore, for the three and nine months ended October 2, 2016 , diluted weighted average shares outstanding do not include the impact of preferred shares that are convertible into 5.2 million and 1.7 million common shares, respectively, because deducting the preferred stock dividends from net income was more dilutive. For purposes of calculating basic earnings per share, unvested restricted stock units are not included in the calculation of basic weighted average shares outstanding until all necessary conditions have been satisfied and issuance of the shares underlying the restricted stock units is no longer contingent. Necessary conditions are not satisfied until the vesting date, at which time holders of our restricted stock units receive shares of our common stock. For purposes of calculating diluted earnings per share, unvested restricted stock units are included to the extent that they are dilutive. In determining whether unvested restricted stock units are dilutive, each issuance of restricted stock units is considered separately. Once a restricted stock unit has vested, it is included in the calculation of both basic and diluted weighted average shares outstanding.

Inventories

Inventories	9 Months Ended
	Oct. 01, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories The major classes of inventories were as follows: October 1, 2017 December 31, 2016 (In thousands) Raw materials $ 119,754 $ 90,019 Work-in-process 39,672 25,166 Finished goods 130,009 99,784 Gross inventories 289,435 214,969 Excess and obsolete reserves (26,941 ) (24,561 ) Net inventories $ 262,494 $ 190,408

Long-Lived Assets

Long-Lived Assets	9 Months Ended
	Oct. 01, 2017
Property, Plant and Equipment [Abstract]
Long-Lived Assets	Long-Lived Assets Depreciation and Amortization Expense We recognized depreciation expense of $11.7 million and $34.6 million in the three and nine months ended October 1, 2017 , respectively. We recognized depreciation expense of $11.6 million and $35.3 million in the three and nine months ended October 2, 2016 , respectively. In connection with the segment change discussed in Note 4, we re-evaluated the useful life of the Tripwire trademark and concluded that an indefinite life is no longer appropriate. We have estimated a useful life of 10 years and will re-evaluate this estimate if and when our expected use of the Tripwire trademark changes. We began amortizing the Tripwire trademark in the first quarter of 2017, which resulted in amortization expense of $0.8 million and $2.4 million for the three and nine months ended October 1, 2017, respectively. As of October 1, 2017 , the net book value of the Tripwire trademark was $28.6 million . We recognized amortization expense related to our intangible assets of $27.2 million and $77.9 million in the three and nine months ended October 1, 2017 , respectively. We recognized amortization expense related to our intangible assets of $23.8 million and $75.6 million in the three and nine months ended October 2, 2016 , respectively.

Severance, Restructuring, and A

Severance, Restructuring, and Acquisition Integration Activities	9 Months Ended
	Oct. 01, 2017
Restructuring and Related Activities [Abstract]
Severance, Restructuring, and Acquisition Integration Activities	Severance, Restructuring, and Acquisition Integration Activities Industrial and Network Solutions Restructuring Program: 2015-2016 Both our Industrial Solutions and Network Solutions segments were negatively impacted by a decline in sales volume in 2015. At such time, global demand for industrial products was negatively impacted by the strengthened U.S. dollar and lower energy prices. As a result, our customers reduced their capital spending. In response to these industrial market conditions, we began to execute a restructuring program in the fourth fiscal quarter of 2015 to reduce our cost structure. We recognized $2.6 million and $8.4 million of severance and other restructuring costs for this program during the three and nine months ended October 2, 2016, respectively. Most of these costs were incurred by our Network Solutions segment. We did not incur any severance and other restructuring costs for this program in 2017. To date, we have incurred a total of $13 million in severance and other restructuring costs for this program. We expect the restructuring program to generate approximately $18 million of savings on an annualized basis, and we are substantially realizing such benefits. Industrial Manufacturing Footprint Program: 2016 - 2017 In 2016, we began a program to consolidate our manufacturing footprint. The manufacturing consolidation is expected to be completed in 2018. We recognized $10.0 million and $12.5 million of severance and other restructuring costs for this program during the three and nine months ended October 2, 2016, respectively. We recognized $11.4 million and $25.3 million of severance and other restructuring costs for this program during the three and nine months ended October 1, 2017 , respectively. The costs were incurred by the Enterprise Solutions and Industrial Solutions segments, as the manufacturing locations involved in the program serve both platforms. To date, we have incurred a total of $43.1 million in severance and other restructuring costs, including manufacturing inefficiencies for this program. We expect to incur approximately $7 million of additional severance and other restructuring costs for this program over 2017 and 2018. We expect the program to generate approximately $13 million of savings on an annualized basis, which we began to realize in the third quarter of 2017. Grass Valley Restructuring Program: 2015-2016 Our Broadcast Solutions segment’s Grass Valley brand was negatively impacted by a decline in global demand of broadcast technology infrastructure products beginning in 2015. Outside of the U.S., demand for these products was impacted by the relative price increase of products due to the strengthened U.S. dollar as well as the impact of weaker economic conditions which resulted in lower capital spending. Within the U.S., demand for these products was impacted by deferred capital spending. We believe broadcast customers deferred their capital spending as they navigated through a number of important industry transitions and a changing media landscape. In response to these broadcast market conditions, we began to execute a restructuring program beginning in the third fiscal quarter of 2015 to reduce our cost structure. We recognized $0.1 million and $5.1 million of severance and other restructuring costs for this program during the three and nine months ended October 2, 2016, respectively. We did not incur any severance and other restructuring costs for this program in 2017. To date, we have incurred a total of $34.1 million in severance and other restructuring costs for this program. We expect the restructuring program to generate approximately $30 million of savings on an annualized basis, and we are substantially realizing such benefits. The following table summarizes the costs by segment of the various programs described above as well as other immaterial programs and acquisition integration activities: Severance Other Restructuring and Integration Costs Total Costs Three Months Ended October 1, 2017 (In thousands) Broadcast Solutions $ 510 $ 2,546 $ 3,056 Enterprise Solutions 712 5,541 6,253 Industrial Solutions 712 6,128 6,840 Network Solutions — 530 530 Total $ 1,934 $ 14,745 $ 16,679 Three Months Ended October 2, 2016 Broadcast Solutions $ (114 ) $ 288 $ 174 Enterprise Solutions (21 ) 5,594 5,573 Industrial Solutions 184 4,562 4,746 Network Solutions 1,103 1,199 2,302 Total $ 1,152 $ 11,643 $ 12,795 Nine Months Ended October 1, 2017 Broadcast Solutions $ 559 $ 3,875 $ 4,434 Enterprise Solutions 2,839 16,428 19,267 Industrial Solutions 865 7,442 8,307 Network Solutions — 831 831 Total $ 4,263 $ 28,576 $ 32,839 Nine Months Ended October 2, 2016 Broadcast Solutions $ (865 ) $ 6,736 $ 5,871 Enterprise Solutions 55 7,225 7,280 Industrial Solutions 1,961 6,021 7,982 Network Solutions 3,734 2,205 5,939 Total $ 4,885 $ 22,187 $ 27,072 Of the total severance, restructuring, and acquisition integration costs recognized in the three months ended October 1, 2017 , $12.4 million , $4.2 million , and $0.1 million were included in cost of sales; selling, general and administrative expenses; and research and development, respectively. Of the total severance, restructuring, and acquisition integration costs recognized in the three months ended October 2, 2016 , $2.9 million , $9.9 million , and $0.0 million were included in cost of sales; selling, general and administrative expenses; and research and development, respectively. Of the total severance, restructuring, and acquisition integration costs recognized in the nine months ended October 1, 2017 , $26.5 million , $6.2 million , and $0.1 million were included in cost of sales; selling, general and administrative expenses; and research and development, respectively. Of the total severance, restructuring, and acquisition integration costs recognized in the nine months ended October 2, 2016 , $6.8 million , $19.6 million , and $0.7 million were included in cost of sales; selling, general and administrative expenses; and research and development, respectively. The other restructuring and integration costs primarily consisted of non-cash pension settlement charges due in part to our restructuring activities as well as equipment transfer, costs to consolidate operating and support facilities, retention bonuses, relocation, travel, legal, and other costs. The majority of the other cash restructuring and integration costs related to these actions were paid as incurred or are payable within the next 60 days . There were no significant severance accrual balances as of October 1, 2017 or December 31, 2016.

Long-Term Debt and Other Borrow

Long-Term Debt and Other Borrowing Arrangements	9 Months Ended
	Oct. 01, 2017
Debt Disclosure [Abstract]
Long-Term Debt and Other Borrowing Arrangements	Long-Term Debt and Other Borrowing Arrangements The carrying values of our long-term debt were as follows: October 1, 2017 December 31, 2016 (In thousands) Revolving credit agreement due 2022 $ — $ — Senior subordinated notes: 3.375% Senior subordinated notes due 2027 528,165 — 4.125% Senior subordinated notes due 2026 234,740 209,081 2.875% Senior subordinated notes due 2025 352,110 — 5.25% Senior subordinated notes due 2024 200,000 200,000 5.50% Senior subordinated notes due 2023 238,805 529,146 5.50% Senior subordinated notes due 2022 — 700,000 9.25% Senior subordinated notes due 2019 — 5,221 Total senior subordinated notes 1,553,820 1,643,448 Less unamortized debt issuance costs (23,743 ) (23,287 ) Long-term debt $ 1,530,077 $ 1,620,161 Revolving Credit Agreement due 2022 On May 16, 2017, we entered into an Amended and Restated Credit Agreement (the Revolver) to amend and restate our prior Revolving Credit Agreement. The Revolver provides a $400.0 million multi-currency asset-based revolving credit facility. The borrowing base under the Revolver includes eligible accounts receivable; inventory; and property, plant and equipment of certain of our subsidiaries in the U.S., Canada, Germany, and the Netherlands. The maturity date of the Revolver is May 16, 2022. Interest on outstanding borrowings is variable, based upon LIBOR or other similar indices in foreign jurisdictions, plus a spread that ranges from 1.25% - 1.75% , depending upon our leverage position. We pay a commitment fee on our available borrowing capacity of 0.25% . In the event we borrow more than 90% of our borrowing base, we are subject to a fixed charge coverage ratio covenant. We recognized a $0.8 million loss on debt extinguishment for unamortized debt issuance costs related to creditors no longer participating in the new Revolver. In connection with executing the Revolver, we paid $2.2 million of fees to creditors and third parties that we will amortize over the remaining term of the Revolver. As of October 1, 2017 , we had no borrowings outstanding on the Revolver, and our available borrowing capacity was $314.1 million . Senior Subordinated Notes In July 2017, we completed an offering for €450.0 million ( $509.5 million at issuance) aggregate principal amount of 3.375% senior subordinated notes due 2027 (the 2027 Notes). The carrying value of the 2027 Notes as of October 1, 2017 is $528.2 million . The 2027 Notes are guaranteed on a senior subordinated basis by our current and future domestic subsidiaries. The 2027 Notes rank equal in right of payment with our senior subordinated notes due 2026, 2025, 2024, and 2023 and with any future subordinated debt, and they are subordinated to all of our senior debt and the senior debt of our subsidiary guarantors, including our Revolver. Interest is payable semiannually on January 15 and July 15 of each year, beginning on January 15, 2018. We paid approximately $8.7 million of fees associated with the issuance of the 2027 Notes, which will be amortized over the life of the 2027 Notes using the effective interest method. We used the net proceeds from this offering and cash on hand to repurchase all of the $700.0 million 2022 Notes outstanding for cash consideration of $722.7 million . We recognized a $29.8 million loss on debt extinguishment including the write-off of unamortized debt issuance costs. We have outstanding €200.0 million aggregate principal amount of 4.125% senior subordinated notes due 2026 (the 2026 Notes). The carrying value of the 2026 Notes as of October 1, 2017 is $234.7 million . The 2026 Notes are guaranteed on a senior subordinated basis by our current and future domestic subsidiaries. The 2026 Notes rank equal in right of payment with our senior subordinated notes due 2027, 2025, 2024, and 2023 and with any future subordinated debt, and they are subordinated to all of our senior debt and the senior debt of our subsidiary guarantors, including our Revolver. Interest is payable semiannually on April 15 and October 15 of each year. In September 2017, we completed an offering for €300.0 million ( $357.2 million at issuance) aggregate principal amount of 2.875% senior subordinated notes due 2025 (the 2025 Notes). The carrying value of the 2025 Notes as of October 1, 2017 is $352.1 million . The 2025 Notes are guaranteed on a senior subordinated basis by our current and future domestic subsidiaries. The 2025 Notes rank equal in right of payment with our senior subordinated notes due 2027, 2026, 2024, and 2023 and with any future subordinated debt, and they are subordinated to all of our senior debt and the senior debt of our subsidiary guarantors, including our Revolver. Interest is payable semiannually on March 15 and September 15 of each year, beginning on March 15, 2018. We paid approximately $5.7 million of fees associated with the issuance of the 2025 Notes, which will be amortized over the life of the 2025 Notes using the effective interest method. We used the net proceeds from this offering to repurchase €300.0 million of the €500.0 million 2023 Notes outstanding. See further discussion below. We have outstanding $200.0 million aggregate principal amount of 5.25% senior subordinated notes due 2024 (the 2024 Notes). The 2024 Notes are guaranteed on a senior subordinated basis by certain of our subsidiaries. The 2024 Notes rank equal in right of payment with our senior subordinated notes due 2027, 2026, 2025, and 2023 and with any future subordinated debt, and they are subordinated to all of our senior debt and the senior debt of our subsidiary guarantors, including our Revolver. Interest is payable semiannually on January 15 and July 15 of each year. We had outstanding €500.0 million aggregate principal amount of 5.5% senior subordinated notes due 2023 (the 2023 Notes). In September 2017, we repurchased €300.0 million of the €500.0 million 2023 Notes outstanding for cash consideration of $377.9 million and recognized a $21.8 million loss on debt extinguishment including the write-off of unamortized debt issuance costs. The carrying value of the 2023 Notes as of October 1, 2017 is $238.8 million . The 2023 Notes are guaranteed on a senior subordinated basis by certain of our subsidiaries. The notes rank equal in right of payment with our senior subordinated notes due 2027, 2026, 2025, and 2024 and with any future subordinated debt, and they are subordinated to all of our senior debt and the senior debt of our subsidiary guarantors, including our Revolver. Interest is payable semiannually on April 15 and October 15 of each year. We had outstanding $5.2 million aggregate principal amount of 9.25% senior subordinated notes due 2019 (the 2019 Notes). On June 15, 2017, we repaid all of the 2019 Notes outstanding, plus accrued interest, and recognized an immaterial loss on debt extinguishment related to unamortized debt issuance costs. Fair Value of Long-Term Debt The fair value of our senior subordinated notes as of October 1, 2017 was approximately $1,582.9 million based on quoted prices of the debt instruments in inactive markets (Level 2 valuation). This amount represents the fair values of our senior subordinated notes with a carrying value of $1,553.8 million as of October 1, 2017 .

Net Investment Hedge

Net Investment Hedge	9 Months Ended
	Oct. 01, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net Investment Hedge	Net Investment Hedge All of our euro denominated notes were issued by Belden Inc., a USD functional currency ledger. As of October 1, 2017, all of our outstanding foreign denominated debt is designated as a net investment hedge on the foreign currency risk of our net investment in our euro foreign operations. The objective of the hedge is to protect the net investment in the foreign operation against adverse changes in exchange rates. The transaction gain or loss is reported in the cumulative translation adjustment section of other comprehensive income. The amount of the cumulative translation adjustment associated with these notes at October 1, 2017 was $25.3 million .

Income Taxes

Income Taxes	9 Months Ended
	Oct. 01, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We recognized an income tax benefit of $11.1 million and $6.7 million for the three and nine months ended October 1, 2017 , respectively, representing effective tax rates of 109.3% and (12.0)% , respectively. The effective tax rates were impacted by the following significant factors: • We recognized an income tax benefit of $2.5 million and $8.4 million in the three and nine months ended October 1, 2017, respectively, as a result of the implementation of a foreign tax credit planning strategy. • Foreign tax rate differences reduced our income tax expense by approximately $1.4 million and $8.4 million in the three and nine months ended October 1, 2017, respectively. The statutory tax rates associated with our foreign earnings generally are lower than the statutory U.S. tax rate of 35% . This had the greatest impact on our income before taxes that is generated in Germany, Canada, and the Netherlands, which have statutory tax rates of approximately 28% , 26% , and 25% , respectively. • We also recognized an income tax benefit of $6.4 million and $11.7 million in the three and nine months ended October 1, 2017, respectively, related to non-taxable currency translation gains. All other items impacting the effective tax rate represented a net expense of $2.6 million and $2.3 million in the three and nine months ended October 1, 2017, respectively. We recognized income tax expense of $2.4 million for the three months ended October 2, 2016 , representing an effective tax rate of 6.2% . We recognized an income tax benefit of $1.1 million for the nine months ended October 2, 2016 , representing an effective tax rate of (1.2)% . The effective tax rates were impacted by the following significant factors: • We recognized $2.9 million and $11.0 million of tax benefit in the three and nine months ended October 2, 2016 , respectively, as the result of securing a significant tax deduction for a foreign currency loss by implementing several transactions related to our international tax structure. • We also recognized a $7.0 million tax benefit in the nine months ended October 2, 2016 for the reduction of deferred tax liabilities related to a previously completed acquisition. As part of an implemented tax planning strategy, we secured a Private Letter Ruling from the Internal Revenue Service that effectively increased the tax basis in the acquired assets to the full fair value. Accordingly, a book-tax difference was eliminated, and we reversed deferred tax liabilities previously recorded, resulting in the tax benefit. • In the three and nine months ended October 2, 2016 , we recognized tax benefits of $2.2 million and $6.0 million , respectively, as a result of reducing a deferred tax valuation allowance related to net operating loss carryforwards in a foreign jurisdiction. Based on certain restructuring transactions in the nine months ended October 2, 2016 , the net operating loss carryforwards are expected to be realizable. The tax benefits described above for the nine months ended October 2, 2016 were partially offset by a $2.7 million tax expense to record a liability for uncertain tax positions in one of our foreign jurisdictions.

Pension and Other Postretiremen

Pension and Other Postretirement Obligations	9 Months Ended
	Oct. 01, 2017
Retirement Benefits [Abstract]
Pension and Other Postretirement Obligations	Pension and Other Postretirement Obligations The following table provides the components of net periodic benefit costs for our pension and other postretirement benefit plans: Pension Obligations Other Postretirement Obligations Three Months Ended October 1, 2017 October 2, 2016 October 1, 2017 October 2, 2016 (In thousands) Service cost $ 1,206 $ 1,282 $ 14 $ 11 Interest cost 1,822 2,202 344 305 Expected return on plan assets (2,487 ) (2,931 ) — — Amortization of prior service credit (10 ) (11 ) — (11 ) Actuarial losses 633 659 23 29 Settlement loss — 7,385 — — Net periodic benefit cost $ 1,164 $ 8,586 $ 381 $ 334 Nine Months Ended Service cost $ 3,549 $ 4,118 $ 41 $ 40 Interest cost 5,391 7,020 1,000 1,152 Expected return on plan assets (7,415 ) (9,339 ) — — Amortization of prior service credit (30 ) (29 ) — (33 ) Actuarial losses 1,866 2,067 68 260 Settlement loss — 7,385 — — Net periodic benefit cost $ 3,361 $ 11,222 $ 1,109 $ 1,419

Comprehensive Income and Accumu

Comprehensive Income and Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Oct. 01, 2017
Equity [Abstract]
Comprehensive Income and Accumulated Other Comprehensive Income (Loss)	Comprehensive Income and Accumulated Other Comprehensive Income (Loss) The following table summarizes total comprehensive income: Three Months Ended Nine Months Ended October 1, 2017 October 2, 2016 October 1, 2017 October 2, 2016 (In thousands) Net income $ 945 $ 36,072 $ 62,417 $ 94,363 Foreign currency translation loss, net of $1.1 million, $0.4 million, $1.5 million, and $1.5 million tax, respectively (19,535 ) (8,762 ) (46,478 ) (9,855 ) Adjustments to pension and postretirement liability, net of $0.2 million, $3.1 million, $0.7 million, and $3.7 million tax, respectively 397 4,952 1,171 5,934 Total comprehensive income (loss) (18,193 ) 32,262 17,110 90,442 Less: Comprehensive loss attributable to noncontrolling interest (66 ) (91 ) (306 ) (318 ) Comprehensive income (loss) attributable to Belden $ (18,127 ) $ 32,353 $ 17,416 $ 90,760 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, 2016 $ (4,661 ) $ (34,406 ) $ (39,067 ) Other comprehensive loss attributable to Belden before reclassifications (46,446 ) — (46,446 ) Amounts reclassified from accumulated other comprehensive income (loss) — 1,171 1,171 Net current period other comprehensive loss attributable to Belden (46,446 ) 1,171 (45,275 ) Balance at October 1, 2017 $ (51,107 ) $ (33,235 ) $ (84,342 ) The following table summarizes the effects of reclassifications from accumulated other comprehensive income (loss) for the nine months ended October 1, 2017 : 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: Actuarial losses $ 1,934 (1) Prior service credit (30 ) (1) Total before tax 1,904 Tax benefit (733 ) Total net of tax $ 1,171 (1) The amortization of these accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit costs (see Note 12).

Preferred Stock

Preferred Stock	9 Months Ended
	Oct. 01, 2017
Equity [Abstract]
Preferred Stock	Preferred Stock On July 26, 2016, we issued 5.2 million depositary shares, each of which represents 1/100th interest in a share of 6.75% Series B Mandatory Convertible Preferred Stock (the Preferred Stock), for an offering price of $100 per depositary share. Holders of the Preferred Stock may elect to convert their shares into common stock at any time prior to the mandatory conversion date. Unless earlier converted, each share of Preferred Stock will automatically convert into common stock on or around July 15, 2019 into between 120.46 and 132.50 shares of Belden common stock, subject to customary anti-dilution adjustments. This represents a range of 6.2 million to 6.9 million shares of Belden common stock to be issued upon conversion. The number of shares of Belden common stock issuable upon the mandatory conversion of the Preferred Stock will be determined based upon the volume-weighted average price of Belden’s common stock over the 20 day trading period beginning on, and including, the 22nd scheduled trading day prior to July 15, 2019. The net proceeds from this offering were approximately $501 million . The net proceeds are for general corporate purposes. With respect to dividend and liquidation rights, the Preferred Stock ranks senior to our common stock and junior to all of our existing and future indebtedness. During the three and nine months ended October 1, 2017 , dividends on the Preferred Stock were $8.7 million and $26.2 million , respectively.

Share Repurchases

Share Repurchases	9 Months Ended
	Oct. 01, 2017
Text Block [Abstract]
Share Repurchases	Share Repurchases On May 25, 2017, our Board of Directors authorized a share repurchase program, which allows us to purchase up to $200.0 million of our common stock through open market repurchases, negotiated transactions, or other means, in accordance with applicable securities laws and other restrictions. This program is funded with cash on hand and cash flows from operating activities. The program does not have an expiration date and may be suspended at any time at the discretion of the Company. During both the three and nine months ended October 1, 2017, we repurchased 0.2 million shares of our common stock under the share repurchase program for an aggregate cost of $11.5 million and an average price per share of $76.16 .

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Oct. 01, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying Condensed Consolidated Financial Statements include Belden Inc. and all of its subsidiaries (the Company, us, we, or our). We eliminate all significant affiliate accounts and transactions in consolidation. The accompanying Condensed Consolidated Financial Statements presented as of any date other than December 31, 2016 : • Are prepared from the books and records without audit, and • Are prepared in accordance with the instructions for Form 10-Q and do not include all of the information required by accounting principles generally accepted in the United States for complete statements, but • Include all adjustments, consisting only of normal recurring adjustments, necessary for a fair presentation of the financial statements. These Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and Supplementary Data contained in our 2016 Annual Report on Form 10-K
Business Description	Business Description We are a signal transmission solutions provider built around four global business platforms – Broadcast Solutions, Enterprise Solutions, Industrial Solutions, and Network Solutions. Our comprehensive portfolio of signal transmission solutions provides industry leading secure and reliable transmission of data, sound, and video for mission critical applications.
Reporting Periods	Reporting Periods Our fiscal year and fiscal fourth quarter both end on December 31. Our fiscal first quarter ends on the Sunday falling closest to 91 days after December 31, which was April 2, 2017, the 92nd day of our fiscal year 2017. Our fiscal second and third quarters each have 91 days. The nine months ended October 1, 2017 and October 2, 2016 included 274 and 276 days, respectively.
Reclassifications	Reclassifications We have made certain reclassifications to the 2016 Condensed Consolidated Financial Statements for our segment change with no impact to reported net income in order to conform to the 2017 presentation. See Note 4.
Operating Segments	Operating Segments To leverage the Company's strengths in networking, IoT, and cybersecurity technologies, effective January 1, 2017, we formed a new segment called Network Solutions, which represents the combination of the prior Industrial IT Solutions and Network Security Solutions segments. The formation is a natural evolution in our organic and inorganic strategies for a range of industrial and non-industrial applications. We have revised the prior period segment information to conform to the change in the composition of these reportable segments. In connection with this change, we re-evaluated the useful life of the Tripwire trademark and concluded that an indefinite life is no longer appropriate. We have estimated a useful life of 10 years and will re-evaluate this estimate if and when our expected use of the Tripwire trademark changes.
Fair Value Measurement	Fair Value Measurement Accounting guidance for fair value measurements specifies a hierarchy of valuation techniques based upon whether the inputs to those valuation techniques reflect assumptions other market participants would use based upon market data obtained from independent sources or reflect our own assumptions of market participant valuation. The hierarchy is broken down into three levels based on the reliability of the inputs as follows: • Level 1 – Quoted prices in active markets that are unadjusted and accessible at the measurement date for identical, unrestricted assets or liabilities; • Level 2 – Quoted prices for identical assets and liabilities in markets that are not active, quoted prices for similar assets and liabilities in active markets, or financial instruments for which significant inputs are observable, either directly or indirectly; and • Level 3 – Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable. As of and during the three and nine months ended October 1, 2017 and October 2, 2016 , we utilized Level 1 inputs to determine the fair value of cash equivalents, and we utilized Level 2 and Level 3 inputs to determine the fair value of net assets acquired in business combinations (see Note 2).
Cash and Cash Equivalents	Cash and Cash Equivalents We classify cash on hand and deposits in banks, including commercial paper, money market accounts, and other investments with an original maturity of three months or less, that we hold from time to time, as cash and cash equivalents. We periodically have cash equivalents consisting of short-term money market funds and other investments. The primary objective of our investment activities is to preserve our capital for the purpose of funding operations. We do not enter into investments for trading or speculative purposes. As of October 1, 2017 , we did not have any significant cash equivalents.
Contingent Liabilities	Contingent Liabilities We have established liabilities for environmental and legal contingencies that are probable of occurrence and reasonably estimable, the amounts of which are currently not material. We accrue environmental remediation costs based on estimates of known environmental remediation exposures developed in consultation with our environmental consultants and legal counsel. We are, from time to time, subject to routine litigation incidental to our business. These lawsuits primarily involve claims for damages arising out of the use of our products, allegations of patent or trademark infringement, and litigation and administrative proceedings involving employment matters and commercial disputes. Based on facts currently available, we believe the disposition of the claims that are pending or asserted will not have a materially adverse effect on our financial position, results of operations, or cash flow.
Revenue Recognition	Revenue Recognition We recognize revenue when all of the following circumstances are satisfied: (1) persuasive evidence of an arrangement exists, (2) price is fixed or determinable, (3) collectability is reasonably assured, and (4) delivery has occurred. Delivery occurs in the period in which the customer takes title and assumes the risks and rewards of ownership of the products specified in the customer’s purchase order or sales agreement. At times, we enter into arrangements that involve the delivery of multiple elements. For these arrangements, when the elements can be separated, the revenue is allocated to each deliverable based on that element’s relative selling price and recognized based on the period of delivery for each element. Generally, we determine relative selling price using vendor specific objective evidence (VSOE) of fair value. We record revenue net of estimated rebates, price allowances, invoicing adjustments, and product returns. We record revisions to these estimates in the period in which the facts that give rise to each revision become known. Taxes collected from customers and remitted to governmental authorities are not included in our revenues. We have certain products subject to the accounting guidance on software revenue recognition. For such products, software license revenue is recognized when persuasive evidence of an arrangement exists, delivery of the product has occurred, the fee is fixed or determinable, collection is probable and VSOE of the fair value of undelivered elements exists. As substantially all of the software licenses are sold in multiple-element arrangements that include either support and maintenance or both support and maintenance and professional services, we use the residual method to determine the amount of software license revenue to be recognized. Under the residual method, consideration is allocated to undelivered elements based upon VSOE of the fair value of those elements, with the residual of the arrangement fee allocated to and recognized as software license revenue. We have established VSOE of the fair value of support and maintenance, subscription-based software licenses, and professional services. Software license revenue is generally recognized upon delivery of the software if all revenue recognition criteria are met. Revenue allocated to support services under our support and maintenance contracts is typically paid in advance and recognized ratably over the term of the service. Revenue allocated to subscription-based software and remote ongoing operational services is also paid in advance and recognized ratably over the term of the service. Revenue allocated to professional services, including remote implementation services, is recognized as the services are performed.
Subsequent Events	Subsequent Events We have evaluated subsequent events after the balance sheet date through the financial statement issuance date for appropriate accounting and disclosure.
Pending Adoption of Recent Accounting Pronouncements	Pending Adoption of Recent Accounting Pronouncements In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (ASU 2014-09), which will replace most existing revenue recognition guidance in U.S. GAAP. The core principle of the ASU is that an entity should recognize revenue for the transfer of goods or services equal to the amount that it expects to be entitled to receive for those goods or services. ASU 2014-09 requires additional disclosure about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. We plan to adopt ASU 2014-09 on January 1, 2018, using the modified retrospective method of adoption. Our overall, initial assessment indicates that the impact of adopting ASU 2014-09 on our consolidated financial statements will not be material. We do not expect significant changes in the timing or method of revenue recognition for any of our material revenue streams. We are currently completing detailed contract reviews to determine if any adjustments are necessary to our existing accounting policies and to support our overall, initial assessment. We believe the most significant impact of adopting ASU 2014-09 will be on our disclosures regarding revenue recognition. We will continue our evaluation of ASU 2014-09, including new or emerging interpretations of the standard, through the date of adoption. In February 2016, the FASB issued Accounting Standards Update No. 2016-02, Leases (ASU 2016-02), a leasing standard for both lessees and lessors. Under its core principle, a lessee will recognize lease assets and liabilities on the balance sheet for all arrangements with terms longer than 12 months. Lessor accounting remains largely consistent with existing U.S. generally accepted accounting principles. The new standard will be effective for us beginning January 1, 2019. Early adoption is permitted. The standard requires the use of a modified retrospective transition method. We are evaluating the effect that ASU 2016-02 will have on our consolidated financial statements and related disclosures. In October 2016, the FASB issued Accounting Standards Update No. 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (ASU 2016-16), which requires recognition of the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. Consequently, the standard eliminates the exception to the recognition of current and deferred income taxes for an intra-entity asset transfer other than for inventory until the asset has been sold to an outside party. The new standard will be effective for us beginning January 1, 2018. Early adoption is permitted. We are evaluating the effect that ASU 2016-16 will have on our consolidated financial statements and related disclosures. In March 2017, the FASB issued Accounting Standards Update No. 2017-07, Compensation - Retirement Benefits: Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07), which requires an entity to report the service cost component in the same line item or items as other compensation costs arising from the service rendered by their employees during the period. The other components of net benefit cost are required to be presented in the Statement of Operations separately from the service cost component after Operating Income. Additionally, only the service cost component will be eligible for capitalization, when applicable. The standard requires the amendments to be applied retrospectively for the presentation of the service cost component and the other cost components of net periodic pension cost and net periodic OPEB cost in the Statement of Operations and prospectively, on and after the effective date, for the capitalization of the service cost component of net periodic pension and OPEB costs. The new standard will be effective for us beginning January 1, 2018. Early adoption is permitted. We are evaluating the effect that ASU 2017-07 will have on our consolidated financial statements and related disclosures.

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Oct. 01, 2017
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the estimated, preliminary fair value of the assets acquired and the liabilities assumed as of May 31, 2017 (in thousands): Cash $ 5,376 Receivables 4,355 Inventory 16,424 Prepaid and other current assets 320 Property, plant, and equipment 4,289 Intangible assets 76,400 Goodwill 68,394 Total assets acquired $ 175,558 Accounts payable $ 1,231 Accrued liabilities 1,353 Deferred revenue 1,702 Total liabilities assumed $ 4,286 Net assets $ 171,272
Schedule of Acquired Intangible Assets	The intangible assets related to the acquisition consisted of the following: Fair Value Amortization Period (In thousands) (In years) Intangible assets subject to amortization: Developed technologies $ 65,200 10.0 Customer relationships 6,600 8.0 Trademarks 3,100 10.0 Sales backlog 1,500 0.3 Total intangible assets subject to amortization $ 76,400 Intangible assets not subject to amortization: Goodwill $ 68,394 n/a Total intangible assets not subject to amortization $ 68,394 Total intangible assets $ 144,794 Weighted average amortization period 9.6
Schedule of Pro Forma Information	The following table illustrates the unaudited pro forma effect on operating results as if the Thinklogical acquisition had been completed as of January 1, 2016. Three Months Ended Nine Months Ended October 1, 2017 October 2, 2016 October1, 2017 October 2, 2016 (In thousands, except per share data) (Unaudited) Revenues $ 621,745 $ 616,760 $ 1,792,614 $ 1,772,202 Net income (loss) attributable to Belden common stockholders (5,128 ) 34,564 37,097 85,588 Diluted income (loss) per share attributable to Belden common stockholders $ (0.12 ) $ 0.81 $ 0.87 $ 2.01

Assets Held for Sale (Tables)

Assets Held for Sale (Tables)	9 Months Ended
	Oct. 01, 2017
Discontinued Operations and Disposal Groups [Abstract]
Summary of Major Assets and Liabilities Classified as Held for Sale	The following table provides the major classes of assets and liabilities classified as held for sale as of October 1, 2017 and December 31, 2016. In addition, the disposal group had $5.1 million and $15.7 million of accumulated other comprehensive losses at October 1, 2017 and December 31, 2016, respectively. October 1, 2017 December 31, 2016 (In thousands) Receivables, net $ 5,937 $ 4,551 Inventories, net 4,302 2,848 Other current assets 1,101 1,131 Property, plant, and equipment, less accumulated depreciation 2,348 1,946 Intangible assets, less accumulated amortization 4,589 4,405 Goodwill 5,477 5,477 Other long-lived assets 36,130 26,766 Total assets of disposal group 59,884 47,124 Impairment of assets held for sale (23,931 ) (23,931 ) Total assets held for sale $ 35,953 $ 23,193 Accrued liabilities $ 1,325 $ 1,288 Postretirement benefits 407 448 Total liabilities held for sale $ 1,732 $ 1,736

Operating Segments (Tables)

Operating Segments (Tables)	9 Months Ended
	Oct. 01, 2017
Segment Reporting [Abstract]
Operating Segment Information	Our measure of segment assets does not include cash, goodwill, intangible assets, deferred tax assets, or corporate assets. All goodwill is allocated to reporting units of our segments for purposes of impairment testing. Broadcast Solutions Enterprise Solutions Industrial Solutions Network Solutions Total Segments (In thousands) As of and for the three months ended October 1, 2017 Segment revenues $ 193,753 $ 167,089 $ 160,471 $ 100,432 $ 621,745 Affiliate revenues 129 1,419 332 — 1,880 Segment EBITDA 35,671 26,409 30,545 24,906 117,531 Depreciation expense 4,088 2,740 3,285 1,570 11,683 Amortization expense 13,482 438 646 12,596 27,162 Severance, restructuring, and acquisition integration costs 3,056 6,253 6,840 530 16,679 Purchase accounting effects of acquisitions 2,922 — — — 2,922 Segment assets 373,848 284,327 291,984 108,554 1,058,713 As of and for the three months ended October 2, 2016 Segment revenues $ 196,173 $ 156,658 $ 149,847 $ 99,790 $ 602,468 Affiliate revenues 46 1,587 511 13 2,157 Segment EBITDA 36,545 27,294 23,649 24,448 111,936 Depreciation expense 4,063 3,210 2,738 1,592 11,603 Amortization expense 10,955 431 604 11,818 23,808 Severance, restructuring, and acquisition integration costs 174 5,573 4,746 2,302 12,795 Deferred gross profit adjustments 283 — — 1,076 1,359 Segment assets 314,020 265,085 261,923 105,938 946,966 As of and for the nine months ended October 1, 2017 Segment revenues $ 550,420 $ 473,504 $ 465,907 $ 293,928 $ 1,783,759 Affiliate revenues 324 5,522 994 92 6,932 Segment EBITDA 90,681 77,310 87,314 65,563 320,868 Depreciation expense 12,095 8,034 9,659 4,806 34,594 Amortization expense 36,950 1,291 1,928 37,775 77,944 Severance, restructuring, and acquisition integration costs 4,434 19,267 8,307 831 32,839 Purchase accounting effects of acquisitions 4,089 — — — 4,089 Segment assets 373,848 284,327 291,984 108,554 1,058,713 As of and for the nine months ended October 2, 2016 Segment revenues $ 560,966 $ 452,951 $ 438,746 $ 296,986 $ 1,749,649 Affiliate revenues 644 4,615 906 44 6,209 Segment EBITDA 89,317 80,605 73,700 66,715 310,337 Depreciation expense 12,086 10,028 8,165 4,974 35,253 Amortization expense 37,306 1,292 1,796 35,209 75,603 Severance, restructuring, and acquisition integration costs 5,871 7,280 7,982 5,939 27,072 Purchase accounting effects of acquisitions 195 — — — 195 Deferred gross profit adjustments 1,391 — — 4,021 5,412 Segment assets 314,020 265,085 261,923 105,938 946,966
Reconciliation of Total Reportable Segments' Revenues and EBITDA to Consolidated Revenues and Consolidated Income from Continuing Operations Before Taxes	The following table is a reconciliation of the total of the reportable segments’ Revenues and EBITDA to consolidated revenues and consolidated income before taxes, respectively. Three Months Ended Nine Months Ended October 1, 2017 October 2, 2016 October 1, 2017 October 2, 2016 (In thousands) Total Segment Revenues $ 621,745 $ 602,468 $ 1,783,759 $ 1,749,649 Deferred revenue adjustments (1) — (1,359 ) — (5,412 ) Consolidated Revenues $ 621,745 $ 601,109 $ 1,783,759 $ 1,744,237 Total Segment EBITDA $ 117,531 $ 111,936 $ 320,868 $ 310,337 Amortization of intangibles (27,162 ) (23,808 ) (77,944 ) (75,603 ) Severance, restructuring, and acquisition integration costs (2) (16,679 ) (12,795 ) (32,839 ) (27,072 ) Depreciation expense (11,683 ) (11,603 ) (34,594 ) (35,253 ) Purchase accounting effects related to acquisitions (3) (2,922 ) — (4,089 ) (195 ) Deferred gross profit adjustments (1) — (1,359 ) — (5,412 ) Income from equity method investment 2,551 586 5,835 1,077 Eliminations (845 ) (977 ) (2,628 ) (2,694 ) Consolidated operating income 60,791 61,980 174,609 165,185 Interest expense, net (19,385 ) (23,513 ) (66,424 ) (71,958 ) Loss on debt extinguishment (51,594 ) — (52,441 ) — Consolidated income (loss) before taxes $ (10,188 ) $ 38,467 $ 55,744 $ 93,227 (1) For the three and nine months ended October 2, 2016 , our segment results include revenues that would have been recorded by acquired businesses had they remained as independent entities. Our consolidated results do not include these revenues due to the purchase accounting effect of recording deferred revenue at fair value. (2) See Note 8, Severance, Restructuring, and Acquisition Integration Activities, for details . (3) For the three and nine months ended October 1, 2017 and nine months ended October 2, 2016 , we recognized cost of sales for the adjustment of acquired inventory to fair value related to the Thinklogical and M2FX acquisitions, respectively.

Income per Share (Tables)

Income per Share (Tables)	9 Months Ended
	Oct. 01, 2017
Earnings Per Share [Abstract]
Basis for Income Per Share Computations	The following table presents the basis for the income per share computations: Three Months Ended Nine Months Ended October 1, 2017 October 2, 2016 October 1, 2017 October 2, 2016 (In thousands) Numerator: Net income $ 945 $ 36,072 $ 62,417 $ 94,363 Less: Net loss attributable to noncontrolling interest (82 ) (88 ) (274 ) (286 ) Less: Preferred stock dividends 8,732 6,695 26,198 6,695 Net income (loss) attributable to Belden common stockholders $ (7,705 ) $ 29,465 $ 36,493 $ 87,954 Denominator: Weighted average shares outstanding, basic 42,256 42,126 42,251 42,073 Effect of dilutive common stock equivalents — 522 412 461 Weighted average shares outstanding, diluted 42,256 42,648 42,663 42,534

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Oct. 01, 2017
Inventory Disclosure [Abstract]
Major Classes of Inventories	The major classes of inventories were as follows: October 1, 2017 December 31, 2016 (In thousands) Raw materials $ 119,754 $ 90,019 Work-in-process 39,672 25,166 Finished goods 130,009 99,784 Gross inventories 289,435 214,969 Excess and obsolete reserves (26,941 ) (24,561 ) Net inventories $ 262,494 $ 190,408

Severance, Restructuring, and28

Severance, Restructuring, and Acquisition Integration Activities (Tables)	9 Months Ended
	Oct. 01, 2017
Restructuring and Related Activities [Abstract]
Severance, Restructuring and Integration Costs by Segment	The following table summarizes the costs by segment of the various programs described above as well as other immaterial programs and acquisition integration activities: Severance Other Restructuring and Integration Costs Total Costs Three Months Ended October 1, 2017 (In thousands) Broadcast Solutions $ 510 $ 2,546 $ 3,056 Enterprise Solutions 712 5,541 6,253 Industrial Solutions 712 6,128 6,840 Network Solutions — 530 530 Total $ 1,934 $ 14,745 $ 16,679 Three Months Ended October 2, 2016 Broadcast Solutions $ (114 ) $ 288 $ 174 Enterprise Solutions (21 ) 5,594 5,573 Industrial Solutions 184 4,562 4,746 Network Solutions 1,103 1,199 2,302 Total $ 1,152 $ 11,643 $ 12,795 Nine Months Ended October 1, 2017 Broadcast Solutions $ 559 $ 3,875 $ 4,434 Enterprise Solutions 2,839 16,428 19,267 Industrial Solutions 865 7,442 8,307 Network Solutions — 831 831 Total $ 4,263 $ 28,576 $ 32,839 Nine Months Ended October 2, 2016 Broadcast Solutions $ (865 ) $ 6,736 $ 5,871 Enterprise Solutions 55 7,225 7,280 Industrial Solutions 1,961 6,021 7,982 Network Solutions 3,734 2,205 5,939 Total $ 4,885 $ 22,187 $ 27,072

Long-Term Debt and Other Borr29

Long-Term Debt and Other Borrowing Arrangements (Tables)	9 Months Ended
	Oct. 01, 2017
Debt Disclosure [Abstract]
Carrying Values of Long-Term Debt and Other Borrowing Arrangements	The carrying values of our long-term debt were as follows: October 1, 2017 December 31, 2016 (In thousands) Revolving credit agreement due 2022 $ — $ — Senior subordinated notes: 3.375% Senior subordinated notes due 2027 528,165 — 4.125% Senior subordinated notes due 2026 234,740 209,081 2.875% Senior subordinated notes due 2025 352,110 — 5.25% Senior subordinated notes due 2024 200,000 200,000 5.50% Senior subordinated notes due 2023 238,805 529,146 5.50% Senior subordinated notes due 2022 — 700,000 9.25% Senior subordinated notes due 2019 — 5,221 Total senior subordinated notes 1,553,820 1,643,448 Less unamortized debt issuance costs (23,743 ) (23,287 ) Long-term debt $ 1,530,077 $ 1,620,161

Pension and Other Postretirem30

Pension and Other Postretirement Obligations (Tables)	9 Months Ended
	Oct. 01, 2017
Retirement Benefits [Abstract]
Components of Net Periodic Benefit Costs	The following table provides the components of net periodic benefit costs for our pension and other postretirement benefit plans: Pension Obligations Other Postretirement Obligations Three Months Ended October 1, 2017 October 2, 2016 October 1, 2017 October 2, 2016 (In thousands) Service cost $ 1,206 $ 1,282 $ 14 $ 11 Interest cost 1,822 2,202 344 305 Expected return on plan assets (2,487 ) (2,931 ) — — Amortization of prior service credit (10 ) (11 ) — (11 ) Actuarial losses 633 659 23 29 Settlement loss — 7,385 — — Net periodic benefit cost $ 1,164 $ 8,586 $ 381 $ 334 Nine Months Ended Service cost $ 3,549 $ 4,118 $ 41 $ 40 Interest cost 5,391 7,020 1,000 1,152 Expected return on plan assets (7,415 ) (9,339 ) — — Amortization of prior service credit (30 ) (29 ) — (33 ) Actuarial losses 1,866 2,067 68 260 Settlement loss — 7,385 — — Net periodic benefit cost $ 3,361 $ 11,222 $ 1,109 $ 1,419

Comprehensive Income and Accu31

Comprehensive Income and Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Oct. 01, 2017
Equity [Abstract]
Total Comprehensive Income	The following table summarizes total comprehensive income: Three Months Ended Nine Months Ended October 1, 2017 October 2, 2016 October 1, 2017 October 2, 2016 (In thousands) Net income $ 945 $ 36,072 $ 62,417 $ 94,363 Foreign currency translation loss, net of $1.1 million, $0.4 million, $1.5 million, and $1.5 million tax, respectively (19,535 ) (8,762 ) (46,478 ) (9,855 ) Adjustments to pension and postretirement liability, net of $0.2 million, $3.1 million, $0.7 million, and $3.7 million tax, respectively 397 4,952 1,171 5,934 Total comprehensive income (loss) (18,193 ) 32,262 17,110 90,442 Less: Comprehensive loss attributable to noncontrolling interest (66 ) (91 ) (306 ) (318 ) Comprehensive income (loss) attributable to Belden $ (18,127 ) $ 32,353 $ 17,416 $ 90,760
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, 2016 $ (4,661 ) $ (34,406 ) $ (39,067 ) Other comprehensive loss attributable to Belden before reclassifications (46,446 ) — (46,446 ) Amounts reclassified from accumulated other comprehensive income (loss) — 1,171 1,171 Net current period other comprehensive loss attributable to Belden (46,446 ) 1,171 (45,275 ) Balance at October 1, 2017 $ (51,107 ) $ (33,235 ) $ (84,342 )
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) for the nine months ended October 1, 2017 : 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: Actuarial losses $ 1,934 (1) Prior service credit (30 ) (1) Total before tax 1,904 Tax benefit (733 ) Total net of tax $ 1,171 (1) The amortization of these accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit costs (see Note 12).

Summary of Significant Accoun32

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	Jul. 05, 2011patent	Nov. 30, 2016USD ($)	Jul. 31, 2015patent	Oct. 01, 2017USD ($)	Oct. 02, 2016USD ($)	Oct. 01, 2017USD ($)Segment	Oct. 02, 2016USD ($)
Significant Accounting Policies [Line Items]
Number of global business platforms | Segment						4
Amortization expense				$ 27,162	$ 23,808	$ 77,944	$ 75,603
Corning | PPC
Significant Accounting Policies [Line Items]
Gain contingency, number of patents allegedly infringed upon | patent	2
Gain contingency, number of patents infringed upon | patent			2
Litigation settlement amount		$ 61,300
Standby Letters of Credit
Significant Accounting Policies [Line Items]
Loss contingency, range of possible loss, portion not accrued				7,800		7,800
Surety Bonds
Significant Accounting Policies [Line Items]
Loss contingency, range of possible loss, portion not accrued				2,400		2,400
Bank Guaranties
Significant Accounting Policies [Line Items]
Loss contingency, range of possible loss, portion not accrued				2,000		$ 2,000
Trademarks
Significant Accounting Policies [Line Items]
Useful life (in years)						10 years
Amortization expense				$ 800		$ 2,400

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	May 31, 2017	Jan. 07, 2016	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Business Acquisition [Line Items]
Revenues			$ 621,745	$ 601,109	$ 1,783,759	$ 1,744,237
Loss before taxes			10,188	$ (38,467)	(55,744)	$ (93,227)
Thinklogical Holdings LLC
Business Acquisition [Line Items]
Percentage of outstanding shares acquired	100.00%
Acquisition price	$ 171,300
Receivables	$ 4,355
Business combination, goodwill, tax deductible amount			41,000		$ 41,000
Business acquisition, goodwill, tax deductible period					15 years
Revenues			11,600		$ 21,800
Loss before taxes			$ 2,700		$ 1,700
M2FX Limited
Business Acquisition [Line Items]
Percentage of outstanding shares acquired		100.00%
Acquisition price		$ 19,000

Acquisitions - Schedule of Reco

Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Oct. 01, 2017	May 31, 2017	Dec. 31, 2016
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Goodwill	$ 1,475,467		$ 1,385,995
Thinklogical Holdings LLC
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Cash		$ 5,376
Receivables		4,355
Inventory		16,424
Prepaid and other current assets		320
Property, plant, and equipment		4,289
Intangible assets		76,400
Goodwill		68,394
Total assets acquired		175,558
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Accounts payable		1,231
Accrued liabilities		1,353
Deferred revenue		1,702
Total liabilities assumed		4,286
Net assets		$ 171,272

Acquisitions - Schedule of Acqu

Acquisitions - Schedule of Acquired Intangible Assets (Details) - Thinklogical Holdings LLC $ in Thousands	May 31, 2017USD ($)
Business Acquisition [Line Items]
Total intangible assets subject to amortization	$ 76,400
Total intangible assets not subject to amortization	68,394
Total intangible assets	$ 144,794
Amortization Period	9 years 7 months 6 days
Goodwill
Business Acquisition [Line Items]
Total intangible assets not subject to amortization	$ 68,394
Developed technologies
Business Acquisition [Line Items]
Total intangible assets subject to amortization	$ 65,200
Amortization Period	10 years
Customer relationships
Business Acquisition [Line Items]
Total intangible assets subject to amortization	$ 6,600
Amortization Period	8 years
Trademarks
Business Acquisition [Line Items]
Total intangible assets subject to amortization	$ 3,100
Amortization Period	10 years
Sales backlog
Business Acquisition [Line Items]
Total intangible assets subject to amortization	$ 1,500
Amortization Period	3 months 19 days

Acquisitions - Schedule of Pro

Acquisitions - Schedule of Pro Forma Information (Details) - Thinklogical Holdings LLC - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Business Acquisition [Line Items]
Revenues	$ 621,745	$ 616,760	$ 1,792,614	$ 1,772,202
Net income (loss) attributable to Belden common stockholders	$ (5,128)	$ 34,564	$ 37,097	$ 85,588
Diluted income (loss) per share attributable to Belden common stockholders (in usd per share)	$ (0.12)	$ 0.81	$ 0.87	$ 2.01

Assets Held for Sale - Narrativ

Assets Held for Sale - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2016	Oct. 01, 2017	Dec. 31, 2016	Apr. 02, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accumulated other comprehensive loss	$ (39,067)	$ (84,342)	$ (39,067)
Discontinued Operations, Held-for-sale | Hirschmann Jv
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposition, sales price	39,000		39,000	$ 39,000
Impairment of assets held for sale	23,900	23,931	23,931
Accumulated other comprehensive loss	$ 15,700	$ 5,100	$ 15,700

Assets Held for Sale - Summary

Assets Held for Sale - Summary of Major Assets and Liabilities Classified as held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2016	Oct. 01, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets held for sale	$ 23,193	$ 35,953	$ 23,193
Total liabilities held for sale	1,736	1,732	1,736
Discontinued Operations, Held-for-sale | Hirschmann Jv
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Receivables, net	4,551	5,937	4,551
Inventories, net	2,848	4,302	2,848
Other current assets	1,131	1,101	1,131
Property, plant, and equipment, less accumulated depreciation	1,946	2,348	1,946
Intangible assets, less accumulated amortization	4,405	4,589	4,405
Goodwill	5,477	5,477	5,477
Other long-lived assets	26,766	36,130	26,766
Total assets of disposal group	47,124	59,884	47,124
Impairment of assets held for sale	(23,900)	(23,931)	(23,931)
Total assets held for sale	23,193	35,953	23,193
Accrued liabilities	1,288	1,325	1,288
Postretirement benefits	448	407	448
Total liabilities held for sale	$ 1,736	$ 1,732	$ 1,736

Operating Segments - Additional

Operating Segments - Additional Information (Detail)	9 Months Ended
	Oct. 01, 2017Segment
Segment Reporting [Abstract]
Number of global business platforms	4

Operating Segments - Operating

Operating Segments - Operating Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Depreciation expense	$ 11,700	$ 11,600	$ 34,600	$ 35,300
Amortization expense	27,162	23,808	77,944	75,603
Severance, restructuring, and acquisition integration costs	16,679	12,795	32,839	27,072
Segment assets	3,704,848		3,704,848		$ 3,806,803
Broadcast Solutions
Segment Reporting Information [Line Items]
Severance, restructuring, and acquisition integration costs	3,056	174	4,434	5,871
Enterprise Solutions
Segment Reporting Information [Line Items]
Severance, restructuring, and acquisition integration costs	6,253	5,573	19,267	7,280
Industrial Solutions
Segment Reporting Information [Line Items]
Severance, restructuring, and acquisition integration costs	6,840	4,746	8,307	7,982
Reportable Segment
Segment Reporting Information [Line Items]
Segment revenues	621,745	602,468	1,783,759	1,749,649
Affiliate revenues	1,880	2,157	6,932	6,209
Segment EBITDA	117,531	111,936	320,868	310,337
Depreciation expense	11,683	11,603	34,594	35,253
Amortization expense	27,162	23,808	77,944	75,603
Severance, restructuring, and acquisition integration costs	16,679	12,795	32,839	27,072
Purchase accounting effects of acquisitions	2,922	0	4,089	195
Deferred gross profit adjustments	0	1,359	0	5,412
Segment assets	1,058,713	946,966	1,058,713	946,966
Reportable Segment | Broadcast Solutions
Segment Reporting Information [Line Items]
Segment revenues	193,753	196,173	550,420	560,966
Affiliate revenues	129	46	324	644
Segment EBITDA	35,671	36,545	90,681	89,317
Depreciation expense	4,088	4,063	12,095	12,086
Amortization expense	13,482	10,955	36,950	37,306
Severance, restructuring, and acquisition integration costs	3,056	174	4,434	5,871
Purchase accounting effects of acquisitions	2,922		4,089	195
Deferred gross profit adjustments		283		1,391
Segment assets	373,848	314,020	373,848	314,020
Reportable Segment | Enterprise Solutions
Segment Reporting Information [Line Items]
Segment revenues	167,089	156,658	473,504	452,951
Affiliate revenues	1,419	1,587	5,522	4,615
Segment EBITDA	26,409	27,294	77,310	80,605
Depreciation expense	2,740	3,210	8,034	10,028
Amortization expense	438	431	1,291	1,292
Severance, restructuring, and acquisition integration costs	6,253	5,573	19,267	7,280
Purchase accounting effects of acquisitions	0		0	0
Deferred gross profit adjustments		0		0
Segment assets	284,327	265,085	284,327	265,085
Reportable Segment | Industrial Solutions
Segment Reporting Information [Line Items]
Segment revenues	160,471	149,847	465,907	438,746
Affiliate revenues	332	511	994	906
Segment EBITDA	30,545	23,649	87,314	73,700
Depreciation expense	3,285	2,738	9,659	8,165
Amortization expense	646	604	1,928	1,796
Severance, restructuring, and acquisition integration costs	6,840	4,746	8,307	7,982
Purchase accounting effects of acquisitions	0		0	0
Deferred gross profit adjustments		0		0
Segment assets	291,984	261,923	291,984	261,923
Reportable Segment | Network Solutions
Segment Reporting Information [Line Items]
Segment revenues	100,432	99,790	293,928	296,986
Affiliate revenues	0	13	92	44
Segment EBITDA	24,906	24,448	65,563	66,715
Depreciation expense	1,570	1,592	4,806	4,974
Amortization expense	12,596	11,818	37,775	35,209
Severance, restructuring, and acquisition integration costs	530	2,302	831	5,939
Purchase accounting effects of acquisitions	0		0	0
Deferred gross profit adjustments		1,076		4,021
Segment assets	$ 108,554	$ 105,938	$ 108,554	$ 105,938

Operating Segments - Reconcilia

Operating Segments - Reconciliation of Total Reportable Segments' Revenues and EBITDA to Consolidated Revenues and Consolidated Income from Continuing Operations Before Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Revenues	$ 621,745	$ 601,109	$ 1,783,759	$ 1,744,237
Amortization of intangibles	(27,162)	(23,808)	(77,944)	(75,603)
Severance, restructuring, and acquisition integration costs	(16,679)	(12,795)	(32,839)	(27,072)
Depreciation expense	(11,700)	(11,600)	(34,600)	(35,300)
Operating income	60,791	61,980	174,609	165,185
Interest expense, net	(19,385)	(23,513)	(66,424)	(71,958)
Loss on debt extinguishment	(51,594)	0	(52,441)	0
Income before taxes	(10,188)	38,467	55,744	93,227
Reportable Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Revenues	621,745	602,468	1,783,759	1,749,649
Deferred revenue adjustments	0	(1,359)	0	(5,412)
Consolidated Revenues	621,745	601,109	1,783,759	1,744,237
Total Segment EBITDA	117,531	111,936	320,868	310,337
Amortization of intangibles	(27,162)	(23,808)	(77,944)	(75,603)
Severance, restructuring, and acquisition integration costs	(16,679)	(12,795)	(32,839)	(27,072)
Depreciation expense	(11,683)	(11,603)	(34,594)	(35,253)
Purchase accounting effects related to acquisitions	(2,922)	0	(4,089)	(195)
Deferred gross profit adjustments	0	(1,359)	0	(5,412)
Income from equity method investment	2,551	586	5,835	1,077
Eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ (845)	$ (977)	$ (2,628)	$ (2,694)

Income Per Share - Basis for In

Income Per Share - Basis for Income Per Share Computations (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Numerator:
Net income	$ 945	$ 36,072	$ 62,417	$ 94,363
Less: Net loss attributable to noncontrolling interest	(82)	(88)	(274)	(286)
Less: Preferred stock dividends	8,732	6,695	26,198	6,695
Net income (loss) attributable to Belden common stockholders	$ (7,705)	$ 29,465	$ 36,493	$ 87,954
Denominator:
Weighted average shares outstanding, basic (in shares)	42,256	42,126	42,251	42,073
Effect of dilutive common stock equivalents (in shares)	0	522	412	461
Weighted average shares outstanding, diluted (in shares)	42,256	42,648	42,663	42,534

Income Per Share - Additional I

Income Per Share - Additional Information (Detail) - shares shares in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from diluted weighted average shares outstanding	0.9	0.4	0.5	0.7
Anti-dilutive shares excluded from diluted weighted average shares outstanding due to performance conditions not being met	0.2	0.1	0.2	0.1
Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from diluted weighted average shares outstanding	6.8	5.2	6.9	1.7

Inventories - Major Classes of

Inventories - Major Classes of Inventories (Detail) - USD ($) $ in Thousands	Oct. 01, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 119,754	$ 90,019
Work-in-process	39,672	25,166
Finished goods	130,009	99,784
Gross inventories	289,435	214,969
Excess and obsolete reserves	(26,941)	(24,561)
Net inventories	$ 262,494	$ 190,408

Long-Lived Assets - Additional

Long-Lived Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Finite-Lived Intangible Assets [Line Items]
Depreciation expense	$ 11,700	$ 11,600	$ 34,600	$ 35,300
Amortization of intangible assets	27,162	$ 23,808	$ 77,944	$ 75,603
Trademarks
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)			10 years
Amortization of intangible assets	800		$ 2,400
Intangible assets	$ 28,600		$ 28,600

Severance, Restructuring and Ac

Severance, Restructuring and Acquisition Integration Activities - Additional Information (Detail) - USD ($) $ in Thousands	Oct. 01, 2017	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 01, 2017	Oct. 01, 2017
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		$ 16,679	$ 12,795	$ 32,839	$ 27,072
Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and integration cost payable period				60 days
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		12,400	2,900	$ 26,500	6,800
Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		4,200	9,900	6,200	19,600
Research and Development
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		100	0	100	700
Industrial Restructuring Program
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs			2,600	0	8,400		$ 13,000
Expected savings from the restructuring program	$ 18,000
Industrial Manufacturing Footprint Program
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs		11,400	10,000	25,300	12,500	$ 43,100
Expected savings from the restructuring program	13,000
Additional severance and other restructuring costs	7,000	$ 7,000		7,000		$ 7,000	$ 7,000	$ 7,000
Grass Valley Restructuring Program
Restructuring Cost and Reserve [Line Items]
Severance, restructuring, and acquisition integration costs			$ 100	$ 0	$ 5,100			$ 34,100
Expected savings from the restructuring program	$ 30,000

Severance, Restructuring and 47

Severance, Restructuring and Acquisition Integration Activities - Severance, Restructuring and Integration Costs by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Restructuring Cost and Reserve [Line Items]
Total Costs	$ 16,679	$ 12,795	$ 32,839	$ 27,072
Broadcast Solutions
Restructuring Cost and Reserve [Line Items]
Total Costs	3,056	174	4,434	5,871
Enterprise Solutions
Restructuring Cost and Reserve [Line Items]
Total Costs	6,253	5,573	19,267	7,280
Industrial Solutions
Restructuring Cost and Reserve [Line Items]
Total Costs	6,840	4,746	8,307	7,982
Network Solutions
Restructuring Cost and Reserve [Line Items]
Total Costs	530	2,302	831	5,939
Severance
Restructuring Cost and Reserve [Line Items]
Severance	1,934	1,152	4,263	4,885
Severance | Broadcast Solutions
Restructuring Cost and Reserve [Line Items]
Severance	510	(114)	559	(865)
Severance | Enterprise Solutions
Restructuring Cost and Reserve [Line Items]
Severance	712	(21)	2,839	55
Severance | Industrial Solutions
Restructuring Cost and Reserve [Line Items]
Severance	712	184	865	1,961
Severance | Network Solutions
Restructuring Cost and Reserve [Line Items]
Severance	0	1,103	0	3,734
Other Restructuring and Integration Costs
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	14,745	11,643	28,576	22,187
Other Restructuring and Integration Costs | Broadcast Solutions
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	2,546	288	3,875	6,736
Other Restructuring and Integration Costs | Enterprise Solutions
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	5,541	5,594	16,428	7,225
Other Restructuring and Integration Costs | Industrial Solutions
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	6,128	4,562	7,442	6,021
Other Restructuring and Integration Costs | Network Solutions
Restructuring Cost and Reserve [Line Items]
Other Restructuring and Integration Costs	$ 530	$ 1,199	$ 831	$ 2,205

Long-Term Debt and Other Borr48

Long-Term Debt and Other Borrowing Arrangements - Carrying Values of Long-Term Debt and Other Borrowing Arrangements (Detail) - USD ($)	Oct. 01, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total senior subordinated notes	$ 1,553,820,000	$ 1,643,448,000
Less unamortized debt issuance costs	(23,743,000)	(23,287,000)
Long-term debt	1,530,077,000	1,620,161,000
Revolving credit agreement due 2022
Debt Instrument [Line Items]
Revolving credit agreement due 2022	0	0
3.375% Senior subordinated notes due 2027
Debt Instrument [Line Items]
Total senior subordinated notes	$ 528,165,000	$ 0
Senior subordinated notes interest rate	3.375%	3.375%
4.125% Senior subordinated notes due 2026
Debt Instrument [Line Items]
Total senior subordinated notes	$ 234,740,000	$ 209,081,000
Senior subordinated notes interest rate	4.125%	4.125%
2.875% Senior subordinated notes due 2025
Debt Instrument [Line Items]
Total senior subordinated notes	$ 352,110,000	$ 0
Senior subordinated notes interest rate	2.875%	2.875%
5.25% Senior subordinated notes due 2024
Debt Instrument [Line Items]
Total senior subordinated notes	$ 200,000,000	$ 200,000,000
Senior subordinated notes interest rate	5.25%	5.25%
5.50% Senior subordinated notes due 2023
Debt Instrument [Line Items]
Total senior subordinated notes	$ 238,805,000	$ 529,146,000
Senior subordinated notes interest rate	5.50%	5.50%
5.50% Senior subordinated notes due 2022
Debt Instrument [Line Items]
Total senior subordinated notes	$ 0	$ 700,000,000
Senior subordinated notes interest rate	5.50%	5.50%
9.25% Senior subordinated notes due 2019
Debt Instrument [Line Items]
Total senior subordinated notes	$ 0	$ 5,221,000
Senior subordinated notes interest rate	9.25%	9.25%

Long-Term Debt and Other Borr49

Long-Term Debt and Other Borrowing Arrangements - Additional Information (Detail)	May 16, 2017USD ($)	Sep. 30, 2017USD ($)	Jul. 31, 2017USD ($)	Oct. 01, 2017USD ($)	Oct. 02, 2016USD ($)	Oct. 01, 2017USD ($)	Oct. 02, 2016USD ($)	Oct. 01, 2017EUR (€)	Oct. 01, 2017USD ($)	Sep. 30, 2017EUR (€)	Sep. 30, 2017USD ($)	Aug. 31, 2017EUR (€)	Jul. 31, 2017EUR (€)	Jul. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Debt Instrument [Line Items]
Loss on debt extinguishment				$ 51,594,000	$ 0	$ 52,441,000	$ 0
Senior subordinated notes									$ 1,553,820,000						$ 1,643,448,000
Senior Subordinated Notes
Debt Instrument [Line Items]
Senior subordinated notes									1,553,800,000
Fair value of debt instrument									1,582,900,000
Revolving credit agreement due 2022
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 400,000,000
Commitment fee percentage	0.25%
Fixed charge coverage, minimum threshold (as a percent)	90.00%
Loss on debt extinguishment	$ 800,000
Fees incurred to creditors and third parties	$ 2,200,000
Borrowings outstanding									0						$ 0
Available borrowing capacity									$ 314,100,000
Revolving credit agreement due 2022 | Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate (as a percent)	1.25%
Revolving credit agreement due 2022 | Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate (as a percent)	1.75%
3.375% Senior subordinated notes due 2027
Debt Instrument [Line Items]
Senior subordinated notes interest rate								3.375%	3.375%						3.375%
Senior subordinated notes									$ 528,165,000						$ 0
3.375% Senior subordinated notes due 2027 | Senior Subordinated Notes
Debt Instrument [Line Items]
Fees incurred to creditors and third parties														$ 8,700,000
Aggregate principal amount outstanding of senior subordinated notes													€ 450,000,000	$ 509,500,000
Senior subordinated notes interest rate													3.375%	3.375%
5.50% Senior subordinated notes due 2022
Debt Instrument [Line Items]
Senior subordinated notes interest rate								5.50%	5.50%						5.50%
Senior subordinated notes									$ 0						$ 700,000,000
5.50% Senior subordinated notes due 2022 | Senior Subordinated Notes
Debt Instrument [Line Items]
Loss on debt extinguishment			$ (29,800,000)
Debt repurchased														$ 700,000,000
Repayments of debt			$ 722,700,000
4.125% Senior subordinated notes due 2026
Debt Instrument [Line Items]
Senior subordinated notes interest rate								4.125%	4.125%						4.125%
Senior subordinated notes									$ 234,740,000						$ 209,081,000
4.125% Senior subordinated notes due 2026 | Senior Subordinated Notes
Debt Instrument [Line Items]
Aggregate principal amount outstanding of senior subordinated notes | €								€ 200,000,000
Senior subordinated notes interest rate								4.125%	4.125%
2.875% Senior subordinated notes due 2025
Debt Instrument [Line Items]
Senior subordinated notes interest rate								2.875%	2.875%						2.875%
Senior subordinated notes									$ 352,110,000						$ 0
2.875% Senior subordinated notes due 2025 | Senior Subordinated Notes
Debt Instrument [Line Items]
Fees incurred to creditors and third parties											$ 5,700,000
Aggregate principal amount outstanding of senior subordinated notes										€ 300,000,000	$ 357,200,000
Senior subordinated notes interest rate										2.875%	2.875%
5.50% Senior subordinated notes due 2023
Debt Instrument [Line Items]
Senior subordinated notes interest rate								5.50%	5.50%						5.50%
Senior subordinated notes									$ 238,805,000						$ 529,146,000
5.50% Senior subordinated notes due 2023 | Senior Subordinated Notes
Debt Instrument [Line Items]
Loss on debt extinguishment		$ 21,800,000
Aggregate principal amount outstanding of senior subordinated notes | €												€ 500,000,000
Senior subordinated notes interest rate								5.50%	5.50%
Debt repurchased | €										€ 300,000,000
Repayments of debt		$ 377,900,000
5.25% Senior subordinated notes due 2024
Debt Instrument [Line Items]
Senior subordinated notes interest rate								5.25%	5.25%						5.25%
Senior subordinated notes									$ 200,000,000						$ 200,000,000
5.25% Senior subordinated notes due 2024 | Senior Subordinated Notes
Debt Instrument [Line Items]
Aggregate principal amount outstanding of senior subordinated notes									$ 200,000,000
Senior subordinated notes interest rate								5.25%	5.25%
9.25% Senior subordinated notes due 2019
Debt Instrument [Line Items]
Senior subordinated notes interest rate								9.25%	9.25%						9.25%
Senior subordinated notes									$ 0						$ 5,221,000

Net Investment Hedge (Details)

Net Investment Hedge (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency translation adjustment	$ (19,535)	$ (8,762)	$ (46,478)	$ (9,855)
Senior Subordinate Notes | 4.125% Senior subordinated notes due 2026
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency translation adjustment			$ 25,300

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Operating Loss Carryforwards [Line Items]
Income tax benefit (expense)	$ 11,133	$ (2,395)	$ 6,673	$ 1,136
Effective tax rate	109.30%	6.20%	(12.00%)	(1.20%)
Income tax benefit from implementing a foreign tax credit planning strategy	$ 2,500		$ 8,400
Foreign tax benefit recognized	1,400	$ 2,900	$ 8,400	$ 11,000
Federal statutory income tax rate (as a percent)			35.00%
Income tax benefit from currency translation gains	6,400		$ 11,700
Income tax expense from other reconciling items	$ 2,600		$ 2,300
Deferred tax benefit recognized				(7,000)
Income tax benefit from reducing a deferred tax valuation allowance		$ (2,200)		(6,000)
Net change in reserve for uncertain tax positions				$ (2,700)
GERMANY
Operating Loss Carryforwards [Line Items]
Federal statutory income tax rate (as a percent)			28.00%
CANADA
Operating Loss Carryforwards [Line Items]
Federal statutory income tax rate (as a percent)			26.00%
NETHERLANDS
Operating Loss Carryforwards [Line Items]
Federal statutory income tax rate (as a percent)			25.00%

Pension and Other Postretirem52

Pension and Other Postretirement Obligations - Components of Net Periodic Benefit Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Pension Obligations
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,206	$ 1,282	$ 3,549	$ 4,118
Interest cost	1,822	2,202	5,391	7,020
Expected return on plan assets	(2,487)	(2,931)	(7,415)	(9,339)
Amortization of prior service credit	(10)	(11)	(30)	(29)
Actuarial losses	633	659	1,866	2,067
Settlement loss	0	7,385	0	7,385
Net periodic benefit cost	1,164	8,586	3,361	11,222
Other Postretirement Obligations
Defined Benefit Plan Disclosure [Line Items]
Service cost	14	11	41	40
Interest cost	344	305	1,000	1,152
Expected return on plan assets	0	0	0	0
Amortization of prior service credit	0	(11)	0	(33)
Actuarial losses	23	29	68	260
Settlement loss	0	0	0	0
Net periodic benefit cost	$ 381	$ 334	$ 1,109	$ 1,419

Comprehensive Income and Accu53

Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Total Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Equity [Abstract]
Net income	$ 945	$ 36,072	$ 62,417	$ 94,363
Foreign currency translation loss, net of $1.1 million, $0.4 million, $1.5 million, and $1.5 million tax, respectively	(19,535)	(8,762)	(46,478)	(9,855)
Adjustments to pension and postretirement liability, net of $0.2 million, $3.1 million, $0.7 million, and $3.7 million tax, respectively	397	4,952	1,171	5,934
Total comprehensive income (loss)	(18,193)	32,262	17,110	90,442
Less: Comprehensive loss attributable to noncontrolling interest	(66)	(91)	(306)	(318)
Comprehensive income (loss) attributable to Belden	(18,127)	32,353	17,416	90,760
Foreign currency translation, tax income (loss)	1,100	400	1,500	1,500
Adjustments to pension and postretirement liability, tax	$ 200	$ 3,100	$ 700	$ 3,700

Comprehensive Income and Accu54

Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss), Net of Tax (Detail) $ in Thousands	9 Months Ended
	Oct. 01, 2017USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 1,461,317
Other comprehensive loss, net of tax	(45,307)
Ending balance	1,442,360
Foreign Currency Translation Component
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(4,661)
Other comprehensive loss attributable to Belden before reclassifications	(46,446)
Amounts reclassified from accumulated other comprehensive income (loss)	0
Other comprehensive loss, net of tax	(46,446)
Ending balance	(51,107)
Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(34,406)
Other comprehensive loss attributable to Belden before reclassifications	0
Amounts reclassified from accumulated other comprehensive income (loss)	1,171
Other comprehensive loss, net of tax	1,171
Ending balance	(33,235)
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(39,067)
Other comprehensive loss attributable to Belden before reclassifications	(46,446)
Amounts reclassified from accumulated other comprehensive income (loss)	1,171
Other comprehensive loss, net of tax	(45,275)
Ending balance	$ (84,342)

Comprehensive Income and Accu55

Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Summary of Effects of Reclassifications from Accumulated Other Comprehensive Income (Loss) (Detail) $ in Thousands	9 Months Ended
	Oct. 01, 2017USD ($)
Pension and Other Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total net of tax	$ (1,171)
Reclassification out of Accumulated Other Comprehensive Income | Actuarial losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	1,934
Reclassification out of Accumulated Other Comprehensive Income | Prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(30)
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	1,904
Tax benefit	(733)
Total net of tax	$ 1,171

Preferred Stock (Details)

Preferred Stock (Details) $ / shares in Units, $ in Thousands	Jul. 15, 2019shares	Jul. 26, 2016USD ($)trading_day$ / sharesshares	Oct. 01, 2017USD ($)	Oct. 02, 2016USD ($)	Oct. 01, 2017USD ($)	Oct. 02, 2016USD ($)
Class of Stock [Line Items]
Preferred stock dividends | $			$ 8,732	$ 6,695	$ 26,198	$ 6,695
Depository Shares
Class of Stock [Line Items]
Depository shares issued		5,200,000
Interest in preferred stock per depository share		0.01
Six Point Seven Five Percentage Series B Mandatory Convertible Preferred Stock
Class of Stock [Line Items]
Percentage of issued shares		6.75%
Offering price per share (in dollars per share) | $ / shares		$ 100
Threshold trading day period | trading_day		20
Proceeds from offering, net | $		$ 501,000
Six Point Seven Five Percentage Series B Mandatory Convertible Preferred Stock | Scenario, Forecast | Minimum
Class of Stock [Line Items]
Preferred stock converted in to common stock (in shares)	120.46
Number of common stock issued upon conversion (in shares)	6,200,000
Six Point Seven Five Percentage Series B Mandatory Convertible Preferred Stock | Scenario, Forecast | Maximum
Class of Stock [Line Items]
Preferred stock converted in to common stock (in shares)	132.50
Number of common stock issued upon conversion (in shares)	6,900,000

Share Repurchases (Details)

Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 01, 2017	Oct. 01, 2017	May 25, 2017
Text Block [Abstract]
Number of shares authorized for repurchase under the share repurchase program			200,000,000
Shares repurchased	200,000	200,000
Value of shares repurchased	$ 11,500	$ 11,508
Treasury stock acquired, average cost per share (in dollars per share)	$ 76.16	$ 76.12