Bel Fuse (BELFB) 10-K 13 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Jun. 30, 2014	Mar. 01, 2015
Entity Information [Line Items]
Entity Registrant Name	BEL FUSE INC /NJ
Entity Central Index Key	729580
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float		$266.90
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Class A Common Stock [Member]
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding			2,174,912
Class B Common Stock [Member]
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding			9,680,527

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current Assets:
Cash and cash equivalents	$77,138	$62,123
Accounts receivable - less allowance for doubtful accounts of $1,989 and $941 at December 31, 2014 and 2013, respectively	99,605	63,849
Inventories, net	113,630	70,019
Other current assets	20,283	8,164
Total Current Assets	310,656	204,155
Property, plant and equipment, net	70,661	40,896
Intangible assets, net	95,502	29,472
Goodwill	117,573	18,490
Deferred income taxes	7,933	1,680
Other assets	33,700	13,448
Total assets	636,025	308,141
Current Liabilities:
Accounts payable	61,926	29,518
Accrued expenses	42,588	22,442
Current maturities of long-term debt	13,438	0
Short-term borrowings under revolving credit line	0	12,000
Other current liabilities	3,850	3,021
Total current liabilities	121,802	66,981
Long-term liabilities:
Long-term debt, noncurrent	219,187	0
Liability for uncertain tax positions	39,767	1,218
Minimum pension obligation and unfunded pension liability	14,205	10,830
Deferred income taxes	15,865	0
Other long-term liabilities	448	410
Total liabilities	411,274	79,439
Commitments and Contingencies
Stockholders' Equity:
Preferred stock, no par value, 1,000,000 shares authorized; none issued	0	0
Additional paid-in capital	21,626	18,914
Retained earnings	213,901	207,993
Accumulated other comprehensive (loss) income	-11,962	645
Total Stockholders' Equity	224,751	228,702
Total liabilities and stockholders' equity	636,025	308,141
Class A [Member]
Stockholders' Equity:
Common Stock	217	217
Class B [Member]
Stockholders' Equity:
Common Stock	$969	$933

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Current Assets
Accounts receivable, allowance for doubtful accounts	$1,989	$941
Stockholders' Equity:
Preferred stock, par value (in dollars per share)	$0	$0
Preferred stock, authorized (in shares)	1,000,000	1,000,000
Preferred stock, issued (in shares)	0	0
Class A [Member]
Stockholders' Equity:
Common stock, par value (in dollars per share)	$0.10	$0.10
Common stock, authorized (in shares)	10,000,000	10,000,000
Common stock, outstanding (in shares)	2,174,912	2,174,912
Common stock, treasury shares (in shares)	1,072,769	1,072,769
Class B [Member]
Stockholders' Equity:
Common stock, par value (in dollars per share)	$0.10	$0.10
Common stock, authorized (in shares)	30,000,000	30,000,000
Common stock, outstanding (in shares)	9,686,777	9,335,677
Common stock, treasury shares (in shares)	3,218,307	3,218,307

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales	$487,076	$349,189	$286,594
Cost of sales	399,100	286,952	240,115
Selling, general and administrative expenses	72,051	45,803	39,571
Restructuring charges	1,832	1,387	5,245
Income from operations	14,093	15,047	1,663
Impairment of investment	0	0	-775
Interest expense	-3,978	-156	-16
Interest income and other, net	276	274	125
Earnings before provision (benefit) for income taxes	10,391	15,165	997
Provision (benefit) for income taxes	1,296	-743	-1,376
Net earnings available to common shareholders	9,095	15,908	2,373
Class A [Member]
Net earnings available to common shareholders	1,580	2,868	372
Net earnings per common share:
Common shares - basic and diluted (in dollars per share)	$0.73	$1.32	$0.17
Weighted-average shares outstanding:
Common shares - basic and diluted (in shares)	2,175	2,175	2,175
Dividends paid per common share:
Common shares (in dollars per share)	$0.24	$0.24	$0.24
Class B [Member]
Net earnings available to common shareholders	$7,515	$13,040	$2,001
Net earnings per common share:
Common shares - basic and diluted (in dollars per share)	$0.79	$1.41	$0.21
Weighted-average shares outstanding:
Common shares - basic and diluted (in shares)	9,491	9,240	9,625
Dividends paid per common share:
Common shares (in dollars per share)	$0.28	$0.28	$0.28

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net earnings	$9,095	$15,908	$2,373
Other comprehensive (loss) income:
Currency translation adjustment, net of taxes of ($219), $77 and $0	-11,269	977	281
Reclassification adjustment for gain (loss) on sale of marketable securities included in net earnings, net of tax of $0, ($37), and $348	0	-61	569
Unrealized holding gains (losses) on marketable securities arising during the period, net of taxes of $90, $45 and $(154)	147	87	-251
Change in unfunded SERP liability, net of taxes of ($631), $457 and $(210), respectively	-1,485	1,069	-476
Other comprehensive (loss) income	-12,607	2,072	123
Comprehensive (loss) income	($3,512)	$17,980	$2,496

CONSOLIDATED_STATEMENTS_OF_COM1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other comprehensive income (loss):
Currency translation adjustment, tax	($219)	($77)	$0
Reclassification adjustment for gain (loss) of marketable securities included in net earnings, tax	0	-37	348
Unrealized holding gains (losses) on marketable securities arising during the period, tax	90	45	-154
Change in unfunded SERP liability, taxes	($631)	$457	($210)

CONSOLIDATED_STATEMENTS_OF_STO

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Total	Class A [Member]	Class B [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Common Stock [Member]	Common Stock [Member]	Additional Paid-in Capital (APIC) [Member]
In Thousands, unless otherwise specified						Class A [Member]	Class B [Member]
Balance at Dec. 31, 2011	$221,080			$196,029	($1,550)	$217	$964	$25,420
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared on Class A common stock	-522			-522
Cash dividends declared on Class B common stock	-2,697			-2,697
Issuance of restricted common stock	0						13	-13
Forfeiture of restricted common stock	0						-3	3
Repurchase/retirement of Class B common stock	-6,644		-6,600				-37	-6,607
Foreign currency translation adjustment	281				281
Unrealized holding gains (losses) on marketable securities arising during the year net of taxes	-251				-251
Reclassification adjustment for unrealized holding gains (losses) included in net earnings, net of taxes	569				569
Increase (Reduction) in APIC pool associated with tax deficiencies related to restricted stock awards	-118							-118
Stock-based compensation expense	1,767							1,767
Change in unfunded SERP liability, net of taxes	-476				-476
Net earnings	2,373	372	2,001	2,373
Balance at Dec. 31, 2012	215,362			195,183	-1,427	217	937	20,452
Balance at Dec. 31, 2011						217
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase/retirement of Class B common stock			-10,000
Balance at Dec. 31, 2013						217
Balance at Dec. 31, 2012	215,362			195,183	-1,427	217	937	20,452
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared on Class A common stock	-522			-522
Cash dividends declared on Class B common stock	-2,576			-2,576
Issuance of restricted common stock	0						16	-16
Forfeiture of restricted common stock	0						-2	2
Repurchase/retirement of Class B common stock	-3,356						-18	-3,338
Foreign currency translation adjustment	977				977
Unrealized holding gains (losses) on marketable securities arising during the year net of taxes	87				87
Reclassification adjustment for unrealized holding gains (losses) included in net earnings, net of taxes	-61				-61
Increase (Reduction) in APIC pool associated with tax deficiencies related to restricted stock awards	-65							-65
Stock-based compensation expense	1,879							1,879
Change in unfunded SERP liability, net of taxes	1,069				1,069
Net earnings	15,908	2,868	13,040	15,908
Balance at Dec. 31, 2013	228,702			207,993	645	217	933	18,914
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared on Class A common stock	-522			-522
Cash dividends declared on Class B common stock	-2,665			-2,665
Issuance of restricted common stock	0						38	-38
Forfeiture of restricted common stock	0						-2	2
Foreign currency translation adjustment	-11,269				-11,269
Unrealized holding gains (losses) on marketable securities arising during the year net of taxes	147				147
Reclassification adjustment for unrealized holding gains (losses) included in net earnings, net of taxes	0
Increase (Reduction) in APIC pool associated with tax deficiencies related to restricted stock awards	31							31
Stock-based compensation expense	2,717							2,717
Change in unfunded SERP liability, net of taxes	-1,485				-1,485
Net earnings	9,095	1,580	7,515	9,095
Balance at Dec. 31, 2014	$224,751			$213,901	($11,962)	$217	$969	$21,626

CONSOLIDATED_STATEMENTS_OF_STO1

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY [Abstract]
Foreign currency translation adjustment, tax effect	($219)	($77)	$0
Unrealized holding gains (losses) on marketable securities, tax effect	90	45	-154
Reclassification adjustment of unrealized holding gains (losses) included in net earnings, tax effect	0	-37	348
Change in unfunded SERP liability, taxes	($631)	$457	($210)

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net earnings	$9,095	$15,908	$2,373
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	19,746	12,382	9,113
Stock-based compensation	2,717	1,879	1,767
Impairment/loss on disposal of assets related to restructuring	0	0	1,389
Impairment of investment	0	0	775
Amortization of deferred financing costs	699	0	0
Deferred income taxes	-2,562	-877	-1,234
Other, net	-3,651	407	422
Changes in operating assets and liabilities:
Accounts receivable	1,382	-8,025	260
Inventories	9,121	-6,538	-343
Other current assets	693	1,702	-273
Other assets	-450	-62	-230
Accounts payable	-3,890	1,485	-1,422
Accrued expenses	-10,170	-7,548	553
Other liabilities	423	165	11
Accrued restructuring costs	0	-122	122
Income taxes payable	-696	-175	-1,674
Net cash provided by operating activities	22,457	10,581	11,609
Cash flows from investing activities:
Purchase of property, plant and equipment	-9,042	-6,940	-4,744
Purchase of intangible asset	0	-1,336	0
Purchase of marketable securities	-2,936	0	-24
Purchase of company-owned life insurance	-2,820	-2,820	0
Cash transferred from (to) restricted cash	0	12,993	0
Payments for acquisitions, net of cash acquired	-208,693	-30,994	-19,410
Proceeds from cash surrender of COLI policies	5,756	0	0
Proceeds from sale of marketable securities	0	2,820	5,119
Proceeds from disposal/sale of property, plant and equipment	65	96	193
Net cash used in investing activities	-217,670	-26,181	-18,866
Cash flows from financing activities:
Dividends paid to common shareholders	-3,160	-3,111	-3,225
Deferred financing costs	-5,756	0	0
Borrowings under revolving credit line	23,000	12,000	0
Repayments under revolving credit line	-12,000	0	0
Increase (reduction) in notes payable	-161	506	-17
Proceeds from long-term debt	215,000	0	0
Repayments of long-term debt	-5,375	0	0
Purchase and retirement of Class B common stock	0	-3,356	-6,644
Net cash provided by (used in) financing activities	211,548	6,039	-9,886
Effect of exchange rate changes on cash	-1,320	422	164
Net increase (decrease) in cash and cash equivalents	15,015	-9,139	-16,979
Cash and cash equivalents - beginning of year	62,123	71,262	88,241
Cash and cash equivalents - end of year	77,138	62,123	71,262
Cash paid (received) during the year for:
Income taxes, net of refunds received	4,686	-474	1,464
Interest payments	3,210	156	16
Details of acquisition (see Note 2):
Fair value of identifiable net assets acquired	136,133	34,541	13,336
Goodwill	100,016	4,812	9,065
Fair value of net assets acquired	236,149	39,353	22,401
Fair value of consideration transferred	236,149	39,353	22,401
Less: Cash acquired in acquisition	-27,456	-8,359	-2,991
Cash paid for acquisition, net of cash acquired	$208,693	$30,994	$19,410

DESCRIPTION_OF_BUSINESS_AND_SU

DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2014
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	1.            DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Bel Fuse Inc. and subsidiaries ("Bel," the "Company," "we," "us," and "our") design, manufacture and sell a broad array of products that power, protect and connect electronic circuits.  These products are used in the networking, telecommunication, high-speed data transmission, commercial aerospace, military, broadcasting, transportation and consumer electronic industries around the world.  We manage our operations geographically through our three reportable operating segments: North America, Asia and Europe.
	On June 19, 2014, we completed our acquisition of 100% of the issued and outstanding capital stock of the Power-One Power Solutions business ("Power Solutions") of ABB Ltd.  On July 25, 2014, we completed our acquisition of 100% of the issued and outstanding capital stock of the U.S. and U.K. Connectivity Solutions businesses from Emerson Electric Co. ("Emerson").  On August 29, 2014, we completed our acquisition of the Connectivity Solutions business in China from Emerson (collectively with the U.S. and U.K. portion of the transaction, "Connectivity Solutions").  The acquisitions of Power Solutions and Connectivity Solutions may hereafter be referred to collectively as either the "2014 Acquisitions" or the "2014 Acquired Companies".
	On March 29, 2013, we completed our acquisition of 100% of the issued and outstanding capital stock of Transpower Technologies (HK) Limited ("Transpower") and certain other tangible and intangible assets related to the Transpower magnetics business of TE Connectivity ("TE").  These operations are now doing business as TRP Connector ("TRP").  On August 20, 2013, we completed our acquisition of 100% of the issued and outstanding capital stock of Array Connector Corporation ("Array"). The acquisitions of TRP and Array may hereafter be referred to collectively as either the "2013 Acquisitions" or the "2013 Acquired Companies".
	On March 9, 2012, we completed our acquisition of 100% of the issued and outstanding capital stock of GigaCom Interconnect AB ("GigaCom").  On July 31, 2012, we consummated our acquisition of 100% of the issued and outstanding capital stock of Fibreco Ltd. ("Fibreco").  On September 12, 2012, we completed our acquisition of 100% of the issued and outstanding capital stock of Powerbox Italia S.r.L. and its subsidiary, Powerbox Design (collectively, "Powerbox", now merged to form Bel Power Europe S.r.l.). The acquisitions of GigaCom, Fibreco and Powerbox may hereafter be referred to collectively as either the "2012 Acquisitions" or the "2012 Acquired Companies".
	Accordingly, as of the respective acquisition dates, all of the assets acquired and liabilities assumed were recorded at their preliminary fair values and the Company's consolidated results of operations for the years ended December 31, 2014, 2013 and 2012 include the operating results of the acquired companies from their respective acquisition dates through the respective period end dates.  The accompanying consolidated balance sheet as of December 31, 2013 has been restated to reflect the acquisition-date fair values related to property, plant and equipment, intangible assets and various other balance sheet accounts of the 2013 Acquired Companies as further outlined in Note 2 to the consolidated financial statements contained in this Annual Report.  The consolidated statements of operations, stockholders' equity and cash flows for the year ended December 31, 2012 and 2013 reflect measurement period adjustments related to the 2012 and 2013 Acquisitions. In 2014, Power Solutions had a fiscal year end of December 28, 2014.  The financial results during the period from December 29, 2014 through Bel's year-end were not material to our consolidated financial position or results of operations.
	All amounts included in the tables to these notes to consolidated financial statements, except per share amounts, are in thousands.
	Principles of Consolidation - The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, including businesses acquired since their respective dates of acquisition.  All intercompany transactions and balances have been eliminated.
	Use of Estimates - The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP") requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an on-going basis, we evaluate our estimates, including but not limited to those related to product returns, provisions for bad debt, inventories, goodwill, intangible assets, investments, Supplemental Executive Retirement Plan ("SERP") expense, income taxes, contingencies and litigation. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.
	Cash Equivalents - Cash equivalents include short-term investments in money market funds and certificates of deposit with an original maturity of three months or less when purchased.
	Allowance for Doubtful Accounts - We maintain an allowance for doubtful accounts for estimated losses from the inability of our customers to make required payments.  We determine our allowance by both specific identification of customer accounts where appropriate and the application of historical loss experience to non-specific accounts.
	Business Combinations – We  account for business combinations by recognizing the assets acquired, the liabilities assumed, and any noncontrolling interest in the acquiree at the acquisition date, measured at their fair values as of that date, with limited exceptions specified in the accounting literature.  Acquisition-related costs, including restructuring costs,  are recognized separately from the acquisition and will generally be expensed as incurred.
	Effects of Foreign Currency – In non-U.S. locations that are not considered highly inflationary, we translate the balance sheets at the end of period exchange rates with translation adjustments accumulated in stockholders' equity on our consolidated balance sheets. We translate the statements of operations at the average exchange rates during the applicable period.
	Most significant expenses, including raw materials, labor and manufacturing expenses, are incurred primarily in U.S. dollars or the Chinese renminbi, and to a lesser extent in British pounds and Mexican pesos.  The Chinese renminbi appreciated by approximately 0.8% in 2014 as compared to 2013.  Future appreciation of the renminbi would result in the Company's incurring higher costs for all expenses incurred in the PRC.  The Company's European entities, whose functional currencies are euros, British pounds and Czech korunas, enter into transactions which include sales which are denominated principally in euros, British pounds and various other European currencies, and purchases that are denominated principally in U.S. dollars and British pounds.  Such transactions resulted in net realized and unrealized currency exchange gains (losses) of $4.3 million, ($0.6) million and $0.6 million for the years ended December 31, 2014, 2013 and 2012, respectively, which were included in net earnings.  Translation of subsidiaries' foreign currency financial statements into U.S. dollars resulted in translation adjustments of ($11.3) million, $1.0 million and $0.3 million for the years ended December 31, 2014, 2013 and 2012, respectively, which are included in accumulated other comprehensive income (loss).
	Concentration of Credit Risk - Financial instruments which potentially subject us to concentrations of credit risk consist principally of accounts receivable and temporary cash investments.  We grant credit to customers that are primarily original equipment manufacturers and to subcontractors of original equipment manufacturers based on an evaluation of the customer's financial condition, without requiring collateral.  Exposure to losses on receivables is principally dependent on each customer's financial condition.  We control our exposure to credit risk through credit approvals, credit limits and monitoring procedures and establish allowances for anticipated losses.  See Note 12 for disclosures regarding significant customers.
	We place temporary cash investments with quality financial institutions and commercial issuers of short-term paper and, by policy, limit the amount of credit exposure in any one financial instrument.
	Inventories - Inventories are stated at the lower of weighted-average cost or market.
	Revenue Recognition – Revenue is recognized when the product has been delivered and title and risk of loss has passed to the customer, collection of the resulting receivable is deemed reasonably assured by management, persuasive evidence of an arrangement exists and the sales price is fixed and determinable.  Substantially all of our shipments are FCA (free carrier), which provides for title to pass upon delivery to the customer's freight carrier.  Some product is shipped DDP/DDU with title passing when the product arrives at the customer's dock.  DDP is defined as Delivered Duty Paid by the Company and DDU is Delivered Duty Unpaid by the Company.
	For certain customers, we provide consigned inventory, either at the customer's facility or at a third-party warehouse. Sales of consigned inventory are recorded when the customer withdraws inventory from consignment.
	The Company is not contractually obligated to accept returns except for defective product or in instances where the product does not meet the Company's product specifications.  However, the Company may permit its customers to return product for other reasons.  In these instances, the Company would generally require a significant cancellation penalty payment by the customer.  The Company estimates such returns, where applicable, based upon management's evaluation of historical experience, market acceptance of products produced and known negotiations with customers.  Such estimates are deducted from sales and provided for at the time revenue is recognized.
	Product Warranties – Warranties vary by product line and are competitive for the markets in which the Company operates.  Warranties generally extend for one to three years from the date of sale. The Company reviews its warranty liability quarterly based on an analysis of actual expenses and failure rates accompanied with estimated future costs and projected failure rate trends. Factors taken into consideration when evaluating our warranty reserve are (i) historical claims for each product, (ii) volume increases, (iii) life of warranty, (iv) historical warranty repair costs and (v) other factors. To the extent that actual experience differs from our estimate, the provision for product warranties will be adjusted in future periods. Actual warranty repair costs are charged against the reserve balance as incurred.  See Note 11 of the consolidated financial statements.
	Finite-Lived Intangible Assets – Intangible assets with finite lives are stated at cost less accumulated amortization.  Amortization is calculated using the straight-line method over the estimated useful life of the asset.
	Goodwill and Other Indefinite-lived Intangible Assets– Goodwill represents the excess of the aggregate of the following (1) consideration transferred, (2) the fair value of any noncontrolling interest in the acquiree and, (3) if the business combination is achieved in stages, the acquisition-date fair value of our previously held equity interest in the acquiree over the net of the acquisition-date amounts of the identifiable assets acquired and the liabilities assumed.
	We evaluate goodwill and other indefinite-lived intangible assets for impairment annually as of October 1 or more frequently if impairment indicators arise in accordance with Accounting Standards Codification ("ASC") Topic 350, "Intangibles – Goodwill and Other".
	The Company tests goodwill for impairment using a fair value approach at the reporting unit level.  A reporting unit is an operating segment or one level below an operating segment for  which discrete financial information is available and reviewed regularly by management.  Our reporting units are geographical in nature and are North America, Asia and Europe.  Assets and liabilities of the Company have been assigned to the reporting units to the extent they are employed in or are considered a liability related to the operations of the reporting unit and are considered in determining the fair value of the reporting unit.  Reporting units with similar economic characteristics are aggregated for purposes of the goodwill impairment test.
	The goodwill impairment test is a two-step process.  If the fair value of a reporting unit exceeds its carrying amount, goodwill of the reporting unit is considered not impaired and the second step of the impairment test is unnecessary.  If the carrying amount of a reporting unit exceeds its fair value, the second step of the goodwill impairment test is performed to measure the amount of impairment loss, if any.  The second step of the goodwill impairment test, used to measure the amount of impairment loss, compares the implied fair value of goodwill associated with each reporting unit with the carrying amount of that goodwill.  If the carrying amount of goodwill associated with a reporting unit exceeds the implied fair value of that goodwill, an impairment loss shall be recognized in an amount equal to that excess.  No impairment was recognized as a result of the October 1, 2014 and 2013  testing.  See Note 4 of the consolidated financial statements.
	The Company tests indefinite-lived intangible assets for impairment using the relief-from-royalty method (a form of the income approach).  No impairment was recognized as a result of the October 1, 2014 testing.  See Note 4 of the consolidated financial statements.
	Evaluation of Long-lived Assets –  Management reviews long-lived assets for potential impairment whenever significant events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable.  An impairment exists when the carrying amount of the long-lived asset is not recoverable and exceeds its fair value.  The carrying amount of a long-lived asset is not recoverable if it exceeds the sum of the estimated undiscounted cash flows expected to result from the use and eventual disposition of the asset.  If an impairment exists, the resulting writedown would be the difference between fair market value of the long-lived asset and the related net book value
	Depreciation - Property, plant and equipment are stated at cost less accumulated depreciation and amortization.  Depreciation and amortization are calculated primarily using the straight-line method over the estimated useful life of the asset.  The estimated useful lives primarily range from 1 to 39 years for buildings and leasehold improvements, and from 1 to 15 years for machinery and equipment.
	Income Taxes - We account for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the consolidated financial statements.  Under this method, deferred tax assets and liabilities are determined based on the differences between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse.  The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date.
	We record net deferred tax assets to the extent we believe these assets will more-likely-than-not be realized.  In making such determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies and recent financial operations.  We have established  valuation allowances for deferred tax assets that are not likely to be realized.  In the event we were to determine that we would be able to realize our deferred income tax assets in the future in excess of our net recorded amount, we would adjust  the valuation allowance, which would reduce the provision for income taxes.
	We establish reserves for tax contingencies when, despite the belief that our tax return positions are fully supported, it is probable that certain positions may be challenged and may not be fully sustained. The tax contingency reserves are analyzed on a quarterly basis and adjusted based upon changes in facts and circumstances, such as the conclusion of federal and state audits, expiration of the statute of limitations for the assessment of tax, case law and emerging legislation. Our effective tax rate includes the effect of tax contingency reserves and changes to the reserves as considered appropriate by management.
	Earnings per Share  – We utilize the two-class method to report our earnings per share.  The two-class method is an earnings allocation formula that determines earnings per share for each class of common stock according to dividends declared and participation rights in undistributed earnings.  The Company's Certificate of Incorporation, as amended, states that Class B common shares are entitled to dividends at least 5% greater than dividends paid to Class A common shares, resulting in the two-class method of computing earnings per share.  In computing earnings per share, the Company has allocated dividends declared to Class A and Class B based on amounts actually declared for each class of stock and 5% more of the undistributed earnings have been allocated to Class B shares than to the Class A shares on a per share basis.  Basic earnings per common share are computed by dividing net earnings by the weighted-average number of common shares outstanding during the period.  Diluted earnings per common share, for each class of common stock, are computed by dividing net earnings by the weighted-average number of common shares and potential common shares outstanding during the period. There were no potential common shares outstanding during the years ended December 31, 2014, 2013 or 2012 which would have had a dilutive effect on earnings per share.
	The earnings and weighted average shares outstanding used in the computation of basic and diluted earnings per share are as follows:
		2014		2013		2012
	Numerator:
	Net earnings	$	9,095	$	15,908	$	2,373
	Less dividends declared:
	Class A		522		522		522
	Class B		2,665		2,576		2,697
	Undistributed earnings (loss)	$	5,908	$	12,810	$	(846	)
	Undistributed earnings (loss) allocation - basic and diluted:
	Class A undistributed earnings (loss)	$	1,058	$	2,346	$	(150	)
	Class B undistributed earnings (loss)		4,850		10,464		(696	)
	Total undistributed earnings (loss)	$	5,908	$	12,810	$	(846	)
	Net earnings allocation - basic and diluted:
	Class A net earnings	$	1,580	$	2,868	$	372
	Class B net earnings		7,515		13,040		2,001
	Net earnings	$	9,095	$	15,908	$	2,373
	Denominator:
	Weighted average shares outstanding:
	Class A - basic and diluted		2,175		2,175		2,175
	Class B - basic and diluted		9,491		9,240		9,625
	Net earnings per share:
	Class A - basic and diluted	$	0.73	$	1.32	$	0.17
	Class B - basic and diluted	$	0.79	$	1.41	$	0.21
	Research and Development ("R&D") - Our engineering groups are strategically located around the world to facilitate communication with and access to customers' engineering personnel. This collaborative approach enables partnerships with customers for technical development efforts. On occasion, we execute non-disclosure agreements with our customers to help develop proprietary, next generation products destined for rapid deployment.  R&D costs are expensed as incurred, and are included in cost of sales on the consolidated statements of operations. Generally, R&D is performed internally for the benefit of the Company. R&D costs include salaries, building maintenance and utilities, rents, materials, administration costs and miscellaneous other items. R&D expenses for the years ended December 31, 2014, 2013 and 2012 amounted to $21.5 million, $14.1 million and $12.4 million, respectively.  The increase in R&D expense from 2013 to 2014 was primarily due to the inclusion of R&D expense related to the recently-acquired businesses of Power Solutions and Connectivity Solutions.
	Fair Value Measurements - We utilize the accounting guidance for fair value measurements and disclosures for all financial assets and liabilities and nonfinancial assets and liabilities that are recognized or disclosed at fair value in the consolidated financial statements on a recurring basis or on a nonrecurring basis during the reporting period.  The fair value is an exit price, representing the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants based upon the best use of the asset or liability at the measurement date.  The Company utilizes market data or assumptions that market participants would use in pricing the asset or liability.  The accounting guidance establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value.  These tiers are defined as follows:
	Level 1 -  Observable inputs such as quoted market prices in active markets
	Level 2 -  Inputs other than quoted prices in active markets that are either directly or indirectly observable
	Level 3 - Unobservable inputs about which little or no market data exists, therefore requiring an entity to develop its own assumptions
	For financial instruments such as cash and cash equivalents, accounts receivable, accounts payable, accrued expenses and notes payable, the carrying amount approximates fair value because of the short maturities of such instruments.  See Note 5 for additional disclosures related to fair value measurements.
	Recently Issued Accounting Standards
	Recently Adopted Accounting Standards
In November 2014, the FASB issued guidance on pushdown accounting for business combinations.  This amendment provides an acquired entity with an option to apply pushdown accounting in its separate financial statements upon occurrence of an event in which an acquirer obtains control of the acquired entity.  This amendment is effective on November 18, 2014.  The effects of this standard will depend on any future events whereby we obtain control of an entity and elect to apply pushdown accounting.
In July 2013, the FASB issued revised guidance to address the diversity in practice related to the financial statement presentation of unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The Company adopted this guidance as of January 1, 2014, on a prospective basis. The adoption did not have a material impact on the Company's consolidated financial statements.
Accounting Standards Issued But Not Yet Adopted
In January 2015, the FASB issued guidance on simplifying the income statement presentation by eliminating the concept of extraordinary items.  Extraordinary items are events and transactions that are distinguished by their unusual nature and by the infrequency of their occurrence.  Eliminating the extraordinary classification simplifies income statement presentation by altogether removing the concept of extraordinary items from consideration.  This amendment is effective for annual periods beginning after December 15, 2015.  The adoption of this standard is not expected to have a material impact on our consolidated financial position or results of operations.
In August 2014, the FASB issued guidance on the presentation of financial statements when there is substantial doubt about an entity's ability to continue as a going concern. The amendment requires that an entity's management evaluate whether there are conditions or events, considered in the aggregate, that raise substantial doubt about the entity's ability to continue as a going concern within one year after the date that the financial statements are issued. If conditions or events raise substantial doubt about an entity's ability to continue as a going concern, additional disclosure is required to enable users of the financial statements to understand the conditions or events, management's evaluation of the significance of those conditions and management's plans that are intended to alleviate or management's plans that have alleviated substantial doubt. The amendment is effective for annual periods ending after December 15, 2016, and for annual periods and interim periods thereafter. Early application is permitted. Management does not believe that the adoption of this guidance will have any material impact on the Company's consolidated financial position or results of operations.
In June 2014, the FASB issued guidance on stock compensation.  The amendment requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition.  A reporting entity should apply existing guidance in Topic 718 as it relates to awards with performance conditions that affect vesting to account for such awards.  Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered.  The amendment is effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2015.  Earlier adoption is permitted.  Management does not believe that the adoption of this guidance will have any material impact on the Company's consolidated financial position or results of operations.
In May 2014, the FASB issued guidance on the accounting for revenue from contracts with customers that will supersede most existing revenue recognition guidance, including industry-specific guidance. The core principle requires an entity to recognize revenue to depict the transfer of goods and services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In addition, the guidance requires enhanced disclosures regarding the nature, timing and uncertainty of revenue and cash flows arising from an entity's contracts with customers. This guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. Entities can choose to apply the guidance using either the full retrospective approach or a modified retrospective approach. Management is currently evaluating the impact that this guidance will have on the Company's consolidated financial statements, if any, including which transition method it will adopt.
In April 2014, the FASB issued guidance for the reporting of discontinued operations, which also contains new disclosure requirements for both discontinued operations and other disposals that do not meet the definition of a discontinued operation. This guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. The effects of this guidance will depend on future disposals by the Company.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2014
Acquisitions [Abstract]
Acquisitions	2	Acquisitions
	2014 Acquisitions:
	On June 19, 2014, the Company completed its acquisition of Power Solutions for $109.9 million, net of cash acquired.  Power Solutions is a leading provider of high-efficiency and high-density power conversion products for server, storage and networking equipment, industrial applications and power systems.  Power Solutions offers a premier line of standard, modified-standard and custom designed AC/DC, DC/DC and other specific power conversion products for a variety of technologies in data centers, telecommunications and industrial applications.  The acquisition of Power Solutions brings a complementary, industry-leading power product portfolio to Bel's existing line of power products, expands our current customer base in the areas of server, storage and networking equipment and adds industrial and additional transportation applications to the Company's product offering.
	On July 25, 2014, the Company completed its acquisition of the U.S. and U.K. entities of the Emerson Network Power Connectivity Solutions business ("CS") from Emerson Electric Co. On August 29, 2014, the China portion of the transaction closed.  Collectively, the U.S., U.K. and China closings are referred to as the "CS Transaction".  In connection with the CS Transaction, the Company paid a total of $98.8 million, net of cash acquired and including a working capital adjustment.  CS is a leading provider of high‑performance RF/Microwave and Harsh Environment Optical Connectors and Assemblies for military, aerospace, wireless communications, data communications, broadcast and industrial applications. CS is headquartered in Bannockburn, Illinois, and has manufacturing facilities in North America, the U.K. and China.  CS will become part of Bel's Connectivity Solutions product group under the Cinch Connector business.  Management believes the acquisition of CS will enable the Company to further expand into the aerospace and military markets where long-term product reliability resulting from highly engineered solutions is critical. The addition of the CS Stratos brand with our Fibreco/Gigacom Interconnect products will also give the Company a solid position in the expanded beam fiber optic market place.  The CS group will also significantly expand the Company's existing copper‑based product offerings with the addition of RF/Microwave components and assemblies.
	During the year ended December 31, 2014, the Company incurred $7.3 million of acquisition-related costs associated with the 2014 Acquisitions primarily for audit-related costs, investment banker fees and legal fees.  These costs are included in selling, general and administrative expenses on the consolidated statements of operations.
	Fair Value Estimate of Assets Acquired and Liabilities Assumed
	With respect to the 2014 Acquisitions, we are continuing our review of our fair value estimate of assets acquired and liabilities assumed during the measurement period, which will conclude as soon as we receive the information we are seeking about facts and circumstances that existed as of the acquisition date, or learn that more information is not available. This measurement period will not exceed one year from the acquisition date. At the effective date of the acquisition, the assets acquired and liabilities assumed are generally required to be measured at fair value.
	Our fair value estimate of assets acquired and liabilities assumed is pending completion of several elements, including the finalization of an independent appraisal and valuations of fair value of the assets acquired and liabilities assumed and final review by our management. The primary areas that are not yet finalized relate to the tangible assets acquired and liabilities assumed, the valuation of property and equipment, the valuation of intangible assets acquired, legal reserves, favorable or unfavorable contracts, operating leases or commitments, contingent liabilities and income and non-income based taxes. Accordingly, there could be material adjustments to our consolidated financial statements, including changes to our depreciation and amortization expense related to the valuation of property and equipment and intangible assets acquired and their respective useful lives among other adjustments.
	The companies included in the 2014 Acquisitions are subject to legal and regulatory requirements, including but not limited to those related to environmental matters and taxation, in each of the jurisdictions in which they operate. We have conducted a preliminary assessment of the liabilities arising from these matters in each of these jurisdictions and have recognized provisional amounts in our initial accounting for the 2014 Acquisitions for all identified liabilities. However, we are continuing our review of these matters during the measurement period, and if new information obtained about facts and circumstances that existed at the acquisition date identifies adjustments to the liabilities initially recognized, as well as any additional liabilities that existed at the acquisition date, the acquisition accounting will be revised to reflect the resulting adjustments to the provisional amounts initially recognized.
	The final determination of the assets acquired and liabilities assumed will be based on the established fair value of the assets acquired and the liabilities assumed as of the acquisition date. The excess of the purchase price over the fair value of net assets acquired is allocated to goodwill. The final determination of the purchase price, fair values and resulting goodwill may differ significantly from what is reflected in these consolidated financial statements.
	The following table depicts the Company's current preliminary estimates of the respective acquisition date fair values of the consideration paid, identifiable net assets acquired and goodwill:
			Power Solutions					Connectivity Solutions					2014 Acquisitions
			June 19,					July 25/August 29,					Acquisition-Date
			2014					2014*					Fair Values
			(As adjusted)					(As adjusted)					(As adjusted)
	Cash		$	20,912				$	6,544				$	27,456
	Accounts receivable			29,389					9,375					38,764
	Inventories			36,429		(a)			17,632		(a)			54,061
	Other current assets			7,350					2,615					9,965
	Property, plant and equipment			28,175		(b)			9,900		(b)			38,075
	Intangible assets			33,220		(c)			40,000		(c)			73,220
	Other assets			19,171		(d)			2,345					21,516
	Total identifiable assets			174,646					88,411					263,057
	Accounts payable			(26,180	)				(10,682	)				(36,862	)
	Accrued expenses			(25,545	)	(e)			(5,307	)				(30,852	)
	Other current liabilities			223					(57	)				166
	Noncurrent liabilities			(42,062	)	(d)(e)(f)			(17,314	)				(59,376	)
	Total liabilities assumed			(93,564	)				(33,360	)				(126,924	)
	Net identifiable assets acquired			81,082					55,051					136,133
	Goodwill			49,710		(g)			50,306		(e)			100,016
	Net assets acquired		$	130,792				$	105,357				$	236,149
	Cash paid		$	130,792				$	105,357				$	236,149
	Assumption of liability			-					-					-
	Fair value of consideration
	transferred			130,792					105,357					236,149
	Deferred consideration			-					-					-
	Total consideration paid		$	130,792				$	105,357				$	236,149
	* The Company acquired the U.S. and U.K. entities of Connectivity Solutions on July 25, 2014 and the China entity of Connectivity Solutions on August 29, 2014.  These values represent the estimated fair values as of the respective acquisition dates.
	(a)	The inventories noted include the following estimated net step-up in fair value:
			Estimated Net Step-Up in Fair Value
	Power Solutions		$	3,273
	Connectivity Solutions			2,651
	2014 Acquisitions total		$	5,924
	(b)	The property, plant and equipment noted above for Connectivity Solutions includes a $4.3 million step-up based on estimated acquisition-date fair value.  There was no step-up for property, plant and equipment for Power Solutions since the estimated acquisition-date fair value approximated the carrying value of those assets.
	(c)	The preliminary fair value of identifiable intangible assets related to the 2014 Acquired Companies is shown in the table below.  For those intangible assets with finite lives, the acquisition-date fair values will be amortized over their respective estimated future lives utilizing the straight-line method.
			Acquisition-date Fair Values
			Power Solutions				Connectivity Solutions				2014 Acquisitions			Weighted-Average Life
	Trademarks		$	890			$	7,500			$	8,390		Indefinite
	Customer relationships			12,200				22,000				34,200		16 years
	Technology			7,800				9,000				16,800		14 years
	License agreements			11,800				-				11,800		8 years
	Non-compete agreements			530				1,500				2,030		3 years
	Total intangible assets acquired		$	33,220			$	40,000			$	73,220
	(d)	These amounts include a $12.0 million noncurrent liability and offsetting indemnification asset related to an ongoing claim by the Arezzo Revenue Agency in Italy concerning certain tax matters related to what was then Power-One Asia Pacific Electronics Shenzhen Co. Ltd. (now Bel Power Solutions Asia Pacific Electronics Shenzhen Co. Ltd.) for the years 2004 through 2006, as further described in Note 16.
	(e)	The Company acquired a liability for uncertain tax positions related to various tax matters for the years 2007 through 2013.  While resolution of these tax matters are being actively pursued with the applicable taxing authority, these issues remained unresolved as of the filing date of this Annual Report on Form 10-K.
	(f)	Deferred taxes have been established on the previously-mentioned step-ups for inventories, property, plant and equipment and intangible assets.
	(g)	The amount of goodwill is provisional as of the filing date, as the fair value determination of inventories acquired, and appraisals related to property, plant and equipment, various intangible assets and certain liabilities such as lease liabilities is still under review.  The portion of goodwill, if any, that will be deductible for tax purposes is yet to be determined.
	In connection with its acquisition of Power Solutions, the Company acquired a 49% interest in a joint venture in the PRC.  The Company provisionally assigned no value to this investment.  See Note 18, Related Party Transactions, for additional information.
	The results of operations of the 2014 Acquired Companies have been included in the Company's consolidated financial statements for the period subsequent to their respective acquisition dates.  During the year ended December 31, 2014, the 2014 Acquired Companies contributed revenue of $134.3 million and an operating loss of approximately $1.9 million to the Company's consolidated financial results.
	The following unaudited pro forma information presents a summary of the combined results of operations of the Company and the aggregate results of TRP, Array, Power Solutions and Connectivity Solutions for the periods presented as if the 2013 Acquisitions had occurred on January 1, 2012 and the 2014 Acquisitions had occurred on January 1, 2013, along with certain pro forma adjustments.  These pro forma adjustments give effect to the amortization of certain definite-lived intangible assets, adjusted depreciation based upon estimated fair value of assets acquired, interest expense and amortization of deferred financing costs related to the financing of the business combinations, and related tax effects.  The 2014 unaudited pro forma net earnings for the year ended December 31, 2014 were adjusted to exclude $14.9 million ($9.8 million after tax) of non-recurring expenses, including audit, legal and other transaction fees, IT migration costs and employee-related expenses, which were incurred in connection with the 2013 and 2014 Acquisitions.  The 2013 unaudited pro forma net earnings were adjusted to include these charges in addition to an estimated non-recurring expense related to a fair value adjustment to acquisition-date inventory of $5.9 million ($4.1 million after tax) during the year ended December 31, 2013, respectively.  The 2013 results reflected below include merger-related charges incurred by Power Solutions in connection with its acquisition by ABB in July 2013.  The pro forma results do not reflect the realization of any potential cost savings, or any related integration costs. Certain cost savings may result from these acquisitions; however, there can be no assurance that these cost savings will be achieved. The unaudited pro forma results are presented for illustrative purposes only and are not necessarily indicative of the results that would have actually been obtained if the acquisitions had occurred on the assumed dates, nor is the pro forma data intended to be a projection of results that may be obtained in the future:
			Year Ended
			December 31,
			2014				2013
	Revenue		$	629,132			$	710,937
Net earnings			11,705				(65,299	)
Earnings per Class A common share - basic and diluted			0.94				(5.52	)
Earnings per Class B common share - basic and diluted			1.02				(5.77	)
2013 Acquisitions:
On March 29, 2013, the Company completed its acquisition of TRP for $21.0 million, net of cash acquired. The Company's purchase of TRP consisted of the integrated connector module ("ICM") family of products, including RJ45, 10/100 Gigabit, 10G, PoE/PoE+, MRJ21 and RJ.5, a line of modules for smart-grid applications, and discrete magnetics.
On August 20, 2013, the Company completed its acquisition of Array, a manufacturer of aerospace and mil-spec connector products based in Miami, Florida, for $10.0 million in cash.  The acquisition of Array expands the Company's portfolio of connector products that can be offered to the combined customer base, and provides an opportunity to sell other products that Bel manufactures to Array's customers.  Array has become part of Bel's Cinch Connector business.
During the years ended December 31, 2014, 2013 and 2012, the Company incurred $0.1 million, $0.9 million and $1.3 million, respectively, of combined acquisition-related costs associated with the 2012 and 2013 Acquisitions.  These costs are included in selling, general and administrative expense in the accompanying consolidated statements of operations for the years ended December 31, 2014, 2013 and 2012.
The purchase price allocations for TRP and Array were finalized during the first quarter of 2014.  The following table depicts the finalized respective acquisition date fair values of the consideration paid and identifiable net assets acquired:
		TRP				Array				2013 Acquisitions
		March 29,				August 20,				Acquisition-Date
		2013				2013				Fair Values
		(As finalized)				(As finalized)				(As finalized)
Cash		$	8,388			$	-			$	8,388
Accounts receivable			11,541				994				12,535
Inventories			7,355				993				8,348
Other current assets			1,619				428				2,047
Property, plant and equipment			5,790				3,510				9,300
Intangible assets			6,110				1,470				7,580
Other assets			1,349				1,747				3,096
Total identifiable assets			42,152				9,142				51,294
Accounts payable			(8,234	)			(676	)			(8,910	)
Accrued expenses			(4,465	)			(285	)			(4,750	)
Other current liabilities			(759	)			-				(759	)
Noncurrent liabilities			(586	)			(1,748	)			(2,334	)
Total liabilities assumed			(14,044	)			(2,709	)			(16,753	)
Net identifiable assets acquired			28,108				6,433				34,541
Goodwill			1,240				3,572				4,812
Net assets acquired		$	29,348			$	10,005			$	39,353
Fair value of consideration transferred		$	29,348			$	10,005			$	39,353
The measurement period adjustments primarily related to adjustments to fair value based on the appraisals on inventory, property, plant and equipment, and intangible assets.  In addition, various other asset and liability accounts had measurement period adjustments related to deferred taxes.
The results of operations of the 2013 Acquired Companies have been included in the Company's consolidated financial statements for the period subsequent to their respective acquisition dates.  During the years ended December 31, 2014 and 2013, the 2013 Acquired Companies contributed revenue of $75.4 million and $68.6 million, respectively, and operating income of $12.7 million and $8.4 million, respectively, to the Company's consolidated financial results.
2012 Acquisitions:
On March 9, 2012, the Company completed its acquisition of 100% of the issued and outstanding capital stock of GigaCom with a cash payment of $2.7 million (£1.7 million). GigaCom, located in Gothenburg, Sweden, is a supplier of expanded beam fiber optic technology. On July 31, 2012, the Company completed its acquisition of 100% of the issued and outstanding capital stock of Fibreco with a cash payment, net of $2.7 million of cash acquired, of $13.7 million (£8.7 million). Fibreco, located in the United Kingdom, is a supplier of a broad range of expanded beam fiber optic components for use in military communications, outside broadcast and offshore exploration applications.  Both GigaCom and Fibreco have become part of Bel's Cinch Connectivity Solutions business.
On September 12, 2012, the Company completed its acquisition of 100% of the issued and outstanding capital stock of Powerbox, now known as Bel Power Europe, with a cash payment, net of $0.2 million of cash acquired, of $3.0 million and 30,000 restricted shares of the Company's Class B common stock with a grant date fair value of $0.6 million.  Bel Power Europe, located near Milan, Italy, develops high-power AC-DC power conversion solutions targeted at the broadcasting market.
The purchase accounting related to the 2012 Acquisitions was finalized within one year of the respective acquisition dates.  The final purchase price allocation related to the 2012 Acquisitions is outlined in Note 2 of the Company's Annual Report on Form 10-K for the year ended December 31, 2013.  The contributions to revenue and operating income from the 2012 Acquisitions is detailed in Note 12 to the notes to consolidated financial statements.

Restructuring_Activities

Restructuring Activities	12 Months Ended
	Dec. 31, 2014
Restructuring Activities [Abstract]
Restructuring Activities	3	Restructuring Activities
	Activity and liability balances related to restructuring costs for the years ended December 31, 2013 and 2014 are as follows:
					2013							2014
			Liability at				Cash Payments			Liability at				Cash Payments			Liability at
			December 31,		New		and Other			December 31,		New		and Other			December 31,
			2012		Charges		Settlements			2013		Charges		Settlements			2014
	Severance costs		$	122	$	1,239	$	(1,361	)	$	-	$	1,778	$	(1,778	)	$	-
	Transportation of equipment			-		100		(100	)		-		-		-			-
	Other restructuring costs			-		48		(48	)		-		54		(54	)		-
	Total		$	122	$	1,387	$	(1,509	)	$	-	$	1,832	$	(1,832	)	$	-
	During the year ended December 31, 2014, the Company incurred severance costs associated with restructuring of management and sales teams after the acquisitions of Power Solutions and Connectivity Solutions.
	During 2012, Bel initiated the closure of its Cinch North American manufacturing facility in Vinita, Oklahoma, and transition of  the operations to Reynosa, Mexico and a new facility in McAllen, Texas.  The Company recorded $5.2 million related to this restructuring during 2012, comprised primarily of $3.2 million in severance costs, $1.4 million related to asset disposals and $0.6 million of other expenses.  The Cinch restructuring continued into early 2013 and the Company incurred an additional $1.4 million of restructuring costs in 2013 related to these efforts, as detailed in the table above.  These amounts are classified as restructuring charges on the consolidated statements of operations.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2014
Goodwill and Other Intangible Assets [Abstract]
Goodwill and Other Intangible Assets	4	Goodwill and Other Intangible Assets
	Goodwill represents the excess of the purchase price and related acquisition costs over the fair value assigned to the net tangible and other intangible assets acquired in a business acquisition.
	Other intangible assets include patents, technology, license agreements, non-compete agreements and trademarks.  Amounts assigned to these intangible assets have been determined by management.  Management considered a number of factors in determining the allocations, including valuations and independent appraisals.  Trademarks have indefinite lives and are reviewed for impairment on an annual basis.  Other intangible assets, excluding trademarks, are being amortized over 2 to 24 years.
	The changes in the carrying value of goodwill classified by reportable operating segment for the years ended December 31, 2014 and 2013 are as follows:
			Total			North America			Asia			Europe
	Balance at January 1, 2013:
	Goodwill, gross			40,500			15,293			12,875			12,332
	Accumulated impairment charges			(26,941	)		(14,066	)		(12,875	)		-
	Goodwill, net		$	13,559		$	1,227		$	-		$	12,332
	Goodwill allocation related to acquisitions			4,812			3,572			1,240			-
	Foreign currency translation			119			-			(8	)		127
	Balance at December 31, 2013:
	Goodwill, gross			45,431			18,865			14,107			12,459
	Accumulated impairment charges			(26,941	)		(14,066	)		(12,875	)		-
	Goodwill, net		$	18,490		$	4,799		$	1,232		$	12,459
	Goodwill allocation related to acquisitions			100,016			50,118			35,486			14,412
	Measurement period adjustments			(496	)		(496	)		-			-
	Foreign currency translation			(437	)		-			(210	)		(227	)
	Balance at December 31, 2014:
	Goodwill, gross			144,514			68,487			49,383			26,644
	Accumulated impairment charges			(26,941	)		(14,066	)		(12,875	)		-
	Goodwill, net		$	117,573		$	54,421		$	36,508		$	26,644
	During the year ended December 31, 2014, the Company recorded $100.0 million of additional goodwill related to the 2014 Acquisitions.
	During the year ended December 31, 2013, the Company recorded $4.6 million of additional goodwill related to the 2013 Acquisitions.  The goodwill related to the acquisition of TRP was assigned to the Company's Asia operating segment and the goodwill related to the acquisition of Array was assigned to the Company's North America operating segment.  The Company completed its annual goodwill impairment test during the fourth quarter of 2014, noting no impairment.  Management determined that the fair value of the goodwill at December 31, 2014 exceeded its carrying value and that no impairment existed as of that date.
	The Company tests indefinite-lived intangible assets for impairment using a fair value approach, the relief-from-royalty method (a form of the income approach).  At December 31, 2014, the Company's indefinite-lived intangible assets related to the trademarks acquired in the Power Solutions, Connectivity Solutions, Cinch and Fibreco acquisitions.  The Company completed its annual indefinite-lived intangible assets impairment test during the fourth quarter of 2014, noting no impairment.  Management has concluded that the fair value of these trademarks exceeded the related carrying values at December 31, 2014 and that no impairment existed as of that date.
	2014 Annual Impairment Test
	During the fourth quarter of 2014 and 2013, we completed step one of our annual goodwill impairment test for our reporting units. We concluded that the fair values of these reporting units were above their carrying values and, therefore, there was no indication of impairment in either year.
	We estimated the fair value of these reporting units using a weighting of fair values derived from income and market approaches. Under the income approach, we determine the fair value of a reporting unit based on the present value of estimated future cash flows. Cash flow projections are based on management's estimates of revenue growth rates and operating margins, taking into consideration industry and market conditions. The discount rate used is based on a weighted average cost of capital adjusted for the relevant risk associated with the characteristics of the business and the projected cash flows. The market approach estimates fair value based on market multiples of revenue and earnings derived from comparable publicly traded companies with similar operating and investment characteristics as the reporting unit.
	The excess of estimated fair values over carrying value, including goodwill for each of our reporting units that had goodwill as of the 2014 annual impairment test were the following:
	Reporting Unit		% by Which Estimated Fair Value Exceeds Carrying Value
	North America			10	%
	Asia			63	%
	Europe			19	%
	As noted above, the fair value determined under step one of the goodwill impairment test completed in the fourth quarter of 2014 exceeded the carrying value for each reporting unit.  Therefore, there was no impairment of goodwill. However, if the fair value decreases in future periods, the Company may fail step one of the goodwill impairment test and be required to perform step two. In performing step two, the fair value would have to be allocated to all of the assets and liabilities of the reporting unit. Therefore, any potential goodwill impairment charge would be dependent upon the estimated fair value of the reporting unit at that time and the outcome of step two of the impairment test. The fair values of the assets and liabilities of the reporting unit, including the intangible assets, could vary depending on various factors.
	The future occurrence of a potential indicator of impairment, such as a decrease in expected net earnings, adverse equity market conditions, a decline in current market multiples, a decline in our common stock price, a significant adverse change in legal factors or business climates, an adverse action or assessment by a regulator, unanticipated competition, strategic decisions made in response to economic or competitive conditions, or a more-likely-than-not expectation that a reporting unit or a significant portion of a reporting unit will be sold or disposed of, could require an interim assessment for some or all of the reporting units before the next required annual assessment. In the event of significant adverse changes of the nature described above, it may be necessary for us to recognize a non-cash impairment of goodwill, which could have a material adverse effect on our consolidated financial condition and results of operations.
	The components of intangible assets other than goodwill are as follows:
			31-Dec-14									31-Dec-13
			Gross Carrying			Accumulated			Net Carrying			Gross Carrying			Accumulated		Net Carrying
			Amount			Amortization			Amount			Amount			Amortization		Amount
	Patents, licenses and technology		$	38,872		$	4,297		$	34,575		$	11,919		$	1,864	$	10,055
	Customer relationships			45,836			3,062			42,774			11,923			1,191		10,732
	Non-compete agreements			2,781			1,050			1,731			787			483		304
	Trademarks			16,624			202			16,422			8,381			-		8,381
			$	104,113		$	8,611		$	95,502		$	33,010		$	3,538	$	29,472
	During the years ended December 31, 2014 and 2013, the Company recorded $73.2 million and $8.9 million, respectively, of various intangible assets in connection with the recent acquisitions.  A listing of intangible assets acquired with the 2013 and 2014 Acquired Companies and the related weighted-average lives of those assets is detailed in Note 2.  Amortization expense was $5.4 million, $1.9 million and $0.8 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	Estimated amortization expense for intangible assets for the next five years is as follows:
	December 31,		Amortization Expense
	2015		$	7,481
	2016			7,181
	2017			6,848
	2018			6,556
	2019			6,515

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Measurements [Abstract]
Fair Value Measurements	5	Fair Value Measurements
	As of December 31, 2014 and 2013, the Company held certain financial assets that are measured at fair value on a recurring basis.  These consisted of securities that are among the Company's investments in a rabbi trust which are intended to fund the Company's Supplemental Executive Retirement Plan ("SERP") obligations, and other marketable securities described below.  The securities that are held in the rabbi trust are categorized as available-for-sale securities and are included as other assets in the accompanying consolidated balance sheets at December 31, 2014 and 2013.  The gross unrealized gains associated with the investments held in the rabbi trust were $0.7 million and $0.4 million at December 31, 2014 and 2013, respectively.  Such unrealized gains are included, net of tax, in accumulated other comprehensive income.
	As of December 31, 2014 and December 31, 2013, the Company had marketable securities with a combined fair value of less than $0.1 million at each date, and gross unrealized gains of less than $0.1 million at each date.  Such unrealized gains are included, net of tax, in accumulated other comprehensive income.  The fair value of the equity securities is determined based on quoted market prices in public markets and is categorized as Level 1.  As of December 31, 2014 and 2013, our available-for-sale securities, which primarily consist of investments held in a rabbi trust of $6.5 million and $3.3 million, respectively, are measured at fair value using quoted prices in active markets for identical assets (Level 1) inputs.  The Company does not have any financial assets measured at fair value on a recurring basis categorized as Level 3, and there were no transfers in or out of Level 1, Level 2 or Level 3 during 2014 or 2013.  There were no changes to the Company's valuation techniques used to measure asset fair values on a recurring or nonrecurring basis during 2014.
	There were no financial assets accounted for at fair value on a nonrecurring basis as of December 31, 2014 or 2013.
	The Company has other financial instruments, such as cash and cash equivalents, accounts receivable, restricted cash, accounts payable, accrued expenses and notes payable, which are not measured at fair value on a recurring basis but are recorded at amounts that approximate fair value due to their liquid or short-term nature.  The fair value of the Company's long-term debt is estimated using a discounted cash flow method based on interest rates that are currently available for debt issuances with similar terms and maturities.  At December 31, 2014, the estimated fair value of long-term debt was $233.3 million compared to a carrying amount of $232.6 million. The Company did not have any other financial liabilities within the scope of the fair value disclosure requirements as of December 31, 2014.
	Nonfinancial assets and liabilities, such as goodwill, indefinite-lived intangible assets and long-lived assets, are accounted for at fair value on a nonrecurring basis.  These items are tested for impairment upon the occurrence of a triggering event or in the case of goodwill, on at least an annual basis.  See Note 4, Goodwill and Other Intangible Assets for further information about goodwill and other indefinite-lived intangible assets.

Other_Assets

Other Assets	12 Months Ended
	Dec. 31, 2014
Other Assets [Abstract]
Other Assets	6	Other Assets
	At December 31, 2014 and 2013, the Company has obligations of $14.2 million and $10.8 million, respectively, associated with its SERP.  As a means of informally funding these obligations, the Company has invested in life insurance policies related to certain employees and marketable securities held in a rabbi trust.  At December 31, 2014 and 2013, these assets had a combined value of $12.3 million and $11.9 million, respectively.
	Company-Owned Life Insurance
	Investments in company-owned life insurance policies ("COLI") were made with the intention of utilizing them as a long-term funding source for the Company's SERP obligations.  However, the cash surrender value of the COLI does not represent a committed funding source for these obligations.  Any proceeds from these policies are subject to claims from creditors.  The cash surrender value of the COLI of $5.8 million and $8.6 million at December 31, 2014 and 2013, respectively, is included in other assets in the accompanying consolidated balance sheets. During 2014, the Company surrendered $2.9 million of COLI and utilized the proceeds to purchase additional marketable securities within the rabbi trust.  The volatility in global equity markets in recent years has also had a significant effect on the cash surrender value of the COLI policies.  The Company recorded income (expense) to account for the increase (decrease) in cash surrender value in the amount of $0.2 million, $0.7 million and $0.3 million during the years ended December 31, 2014, 2013 and 2012, respectively.  These fluctuations in the cash surrender value were allocated between cost of sales and selling, general and administrative expenses on the consolidated statements of operations for the years ended December 31, 2014, 2013 and 2012.  The allocation is consistent with the costs associated with the long-term employee benefit obligations that the COLI is intended to fund.
	Other Investments
	At December 31, 2014 and 2013, the Company held, in the aforementioned rabbi trust, available-for-sale investments at a cost of $5.8 million and $2.9 million, respectively. Together with the COLI described above, these investments are intended to fund the Company's SERP obligations and are classified as other assets in the accompanying consolidated balance sheets.   The Company monitors these investments for impairment on an ongoing basis.  As discussed above, the Company purchased $2.9 million of additional SERP investments during 2014.  At December 31, 2014 and 2013, the fair market value of these investments was $6.5 million and $3.3 million, respectively.  The gross unrealized gain of $0.7 million and $0.4 million at December 31, 2014 and 2013, respectively, has been included, net of tax, in accumulated other comprehensive income (loss).

Inventories_net

Inventories, net	12 Months Ended
	Dec. 31, 2014
Inventories, net [Abstract]
Inventories, net	7	Inventories, net
	The components of inventories, net are as follows:
			December 31,
			2014		2013
	Raw materials		$	51,638	$	29,428
	Work in progress			16,128		8,783
	Finished goods			45,864		31,808
	Inventories, net		$	113,630	$	70,019

Property_Plant_and_Equipment_n

Property, Plant and Equipment, net	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment, net [Abstract]
Property, Plant and Equipment, net	8	Property, Plant and Equipment, net
	Property, plant and equipment, net consist of the following:
			December 31,
			2014			2013
	Land		$	3,293		$	3,229
	Buildings and improvements			31,067			25,216
	Machinery and equipment			117,973			82,420
	Construction in progress			4,764			4,042
				157,097			114,907
	Accumulated depreciation			(86,436	)		(74,011	)
	Property, plant and equipment, net		$	70,661		$	40,896
	Depreciation expense for the years ended December 31, 2014, 2013 and 2012 was $14.3 million, $10.5 million and $8.4 million, respectively.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Taxes [Abstract]
Income Taxes	9.            Income Taxes
	At December 31, 2014 and 2013, the Company has approximately $40.0 million and $2.2 million, respectively, of liabilities for uncertain tax positions ($0.2 million and $1.0 million, respectively, included in income taxes payable on the consolidated balance sheets and $39.8 million and $1.2 million, respectively, included in liability for uncertain tax positions on the consolidated balance sheets) a portion of which ($2.8 million and $2.2 million, respectively), if recognized, would reduce the Company's effective tax rate.
	The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various states and foreign jurisdictions.  The Company is no longer subject to U.S. federal examinations by tax authorities for years before 2011 and for state examinations before 2008.   Regarding foreign subsidiaries, the Company is no longer subject to examination by tax authorities for years before 2003 in Asia and generally 2007 in Europe.
	As a result of the expiration of the statutes of limitations for specific jurisdictions, it is reasonably possible that the related unrecognized benefits for tax positions taken regarding previously filed tax returns may change materially from those recorded as liabilities for uncertain tax positions in the Company's consolidated financial statements at December 31, 2014.  A total of $0.2 million of previously recorded liabilities for uncertain tax positions relates principally to the 2011 tax year.  The statute of limitations related to these liabilities is scheduled to expire on September 15, 2015.  Additionally, a total of $0.8 million of previously recorded liabilities for uncertain tax positions relating to the 2010 tax year were reversed during the year ended December 31, 2014.  This was offset by an increase to the liability for uncertain tax positions in the amount of $2.7 million, of which $1.2 million relates to interest and penalties on the uncertain tax positions acquired from Power Solutions, which is included in the consolidated statement of operations during the year ended December 31, 2014.  A total of $0.5 million of previously recorded liabilities for uncertain tax positions relating to 2006 and 2009 tax years were reversed during the year ended December 31, 2013.
	A reconciliation of the beginning and ending amount of the liability for uncertain tax positions is as follows:
		2014			2013			2012
	Liability for uncertain tax positions - January 1	$	2,189		$	2,711		$	4,132
	Additions based on tax positions
	related to the current year		2,732			28			1,221
	Additions relating to acquisitions		35,874			-			-
	Settlement/expiration of statutes of limitations		(825	)		(550	)		(2,642	)
	Liability for uncertain tax positions - December 31	$	39,970		$	2,189		$	2,711
	As part of the acquisition of Power Solutions the Company acquired a $35.8 million liability for uncertain tax positions.  Of this amount, $12.0 million relates to an ongoing claim by the Arezzo Revenue Agency in Italy concerning certain tax matters related to what was then Power-One Asia Pacific Electronics Shenzhen Co. Ltd. (now Bel Power Solutions Asia Pacific Electronics Shenzhen Co. Ltd.) for the years 2004 through 2006, as further described in Note 16.  The Company also acquired a liability for additional uncertain tax positions related to various tax matters for the years 2007 through 2013.  Resolution of these tax matters are being actively pursued with the applicable taxing authority.  From the date of acquisition through December 31, 2014, the Company has recorded $1.2 million of interest and penalties pertaining to this issue and will continue to accrue approximately $2.5 million annually until the issue is resolved.
	The Company's policy is to recognize interest and penalties related to uncertain tax positions as a component of the current provision for income taxes.  During the years ended December 31, 2014 and 2013, the Company recognized $1.6 million and an immaterial amount, respectively, in interest and penalties in the consolidated statements of operations.  During the year ended December 31, 2014, the Company recognized a benefit of $0.2 million for the reversal of such interest and penalties.  The Company has approximately $1.6 million and $0.2 million accrued for the payment of interest and penalties at December 31, 2014 and 2013, respectively, which is included in both income taxes payable and liability for uncertain tax positions in the consolidated balance sheets.
	The Company's total income (loss) before provision (benefit) for income taxes included earnings (loss) from domestic operations of ($9.2) million, ($1.2) million and $0.4 million for 2014, 2013 and 2012, respectively, and earnings before provision (benefit) for income taxes from foreign operations of $19.6 million, $16.3 million and $0.6 million for 2014, 2013 and 2012, respectively.
	The provision (benefit) for income taxes consists of the following:
		Years Ended December 31,
		2014			2013			2012
	Current:
	Federal	$	1,924		$	(1,099	)	$	(459	)
	Foreign		1,759			1,120			241
	State		175			113			76
			3,858			134			(142	)
	Deferred:
	Federal		(2,698	)		(865	)		(807	)
	State		(407	)		65			(58	)
	Foreign		543			(77	)		(369	)
			(2,562	)		(877	)		(1,234	)
		$	1,296		$	(743	)	$	(1,376	)
	A reconciliation of taxes on income computed at the U.S. federal statutory rate to amounts provided is as follows:
		Years Ended December 31,
		2014						2013					2012
		$				%		$			%		$			%
	Tax provision computed at the
	federal statutory rate	$	3,638			35	%	$	5,309		35	%	$	339		34	%
	Increase (decrease) in taxes resulting from:
	Different tax rates
	applicable to foreign operations		(4,524	)		(44	%)		(4,677	)	(31	%)		(306	)	(31	%)
	Increase in (reversal of) liability for uncertain
	tax positions - net		1,907			18	%		(522	)	(3	%)		(1,421	)	(143	%)
	Utilization of research and experimentation, solar and foreign
	tax credits		(508	)		(5	%)		(1,049	)	(7	%)		-		0	%
	State taxes, net of federal benefit		(183	)		(2	%)		117		1	%		-		0	%
	Current year valuation allowance - U.S. segment		335			3	%		49		0	%		298		30	%
	Federal tax on profit of foreign disregarded entities
	net of deferred tax		770			7	%		-		0	%		-		0	%
	Permanent differences applicable to U.S. operations,
	including qualified production activity credits,
	SERP/COLI income, unrealized foreign exchange gains
	and amortization of purchase accounting intangibles		(11	)		0	%		(91	)	(1	%)		(260	)	(26	%)
	Other		(128	)		(1	%)		121		1	%		(26	)	(3	%)
	Tax (benefit) provision computed at the Company's
	effective tax rate	$	1,296			12	%	$	(743	)	(5	%)	$	(1,376	)	(138	%)
	The Company holds an offshore business license from the government of Macao.  With this license, a Macao offshore company named Bel Fuse (Macao Commercial Offshore) Limited has been established to handle all of the Company's sales to third-party customers in Asia.  Sales by this company consist of products manufactured in the PRC.  This company is not subject to Macao corporate profit taxes which are imposed at a tax rate of 12%.  Additionally, the Company established TRP International, a China Business Trust ("CBT"), when it acquired the TRP group, as previously discussed.  Sales by the CBT consists of products manufactured in the PRC and sold to third-party customers inside and outside Asia.  The CBT is not subject to PRC income taxes, which are generally imposed at a tax rate of 25%.
	As of December 31, 2014, the Company has gross foreign income tax net operating losses ("NOL") of $19.4 million, foreign tax credits of $0.3 million and capital loss carryforwards of $0.2 million which amount to a total of $4.9 million of deferred tax assets.  The Company has established valuation allowances totaling $4.9 million against these deferred tax assets.  In addition, the Company has gross federal and state income tax NOLs of $27.7 million, including $5.9 million of NOLs acquired from Array and $16.7 million of NOLs acquired from Connectivity Solutions, which amount to $9.0 million of deferred tax assets; capital loss carryforwards of $0.9 million which amount to $0.3 million of deferred tax assets; and tax credit carryforwards of $2.1 million. The Company has established  valuation allowances of $0.2 million, $0.3 million and $1.2 million, respectively, against these deferred tax assets.  The foreign NOL's can be carried forward indefinitely, the NOL acquired from Array expires at various times during 2026 – 2027, the NOL acquired from Connectivity Solutions expire at various times during 2022-2033, the state NOL's expire at various times during 2015 – 2031 and the tax credit carryforwards expire at various times during 2025 - 2034.
	Upon completion of the acquisitions of Power Solutions and Connectivity Solutions, there were net deferred tax assets of $7.1 million and $1.2 million, respectively, arising from various temporary differences and net operating loss carry forward acquired, which are included in the consolidated balance sheet at December 31, 2014.  In connection with the 2014 Acquisitions, the Company was required to complete a fair market value report of property, plant and equipment and intangibles.  As a result of that report, the Company established deferred tax liabilities at the date of acquisition in the amount of $3.1 million and $16.4 million, respectively, for the Power Solutions and Connectivity Solutions acquisitions. At December 31, 2014, a net deferred tax liability of $8.3 million remains on the consolidated balance sheet for the 2014 Acquisitions.
	The Company intends to make elections to step up the tax basis to fair value under IRC Section 338(g) for the Power Solutions acquisition and for certain jurisdictions with respect to the Connectivity Solutions acquisition.  The elections made under Section 338(g) only affect U.S. income taxes (not those of the foreign country where the acquired entities were incorporated).
	Upon the acquisition of TRP, TRP had a deferred tax asset in the amount of $2.2 million arising from various timing differences related to depreciation and accrued expenses.  Upon the acquisition of Array, Array had a deferred tax liability of $0.7 million arising from timing differences related to depreciation and a deferred tax asset of $2.1 million arising from the NOL acquired.  In connection with the 2013 Acquisitions, the Company was required to complete a fair market value report of property, plant and equipment and intangibles.  As a result of that report, the Company established deferred tax liabilities at the date of acquisition in the amount of $0.6 million and $1.0 million respectively for the TRP and Array acquisitions.  At December 31, 2014, a net deferred tax liability of $0.3 million remains on the consolidated balance sheet for the 2013 Acquisitions.
	The Company does not intend to make any election to step up the tax basis of the 2013 Acquisitions to fair value under IRC Section 338(g).
	Upon the acquisition of Fibreco, Fibreco had a deferred tax liability in the amount of $0.1 million arising from various timing differences. In connection with the 2012 Acquisitions, the Company was required to complete a fair market value report of property, plant and equipment and intangibles. As a result of that report, the Company established deferred tax liabilities at the date of acquisition in the amount of $1.7 million, $0.6 million and $0.4 million, respectively for the Fibreco, GigaCom and Powerbox acquisitions.  At December 31, 2014, a deferred tax liability of $2.1 million remains on the consolidated balance sheet for the 2012 Acquisitions.
	The Company has made elections under Internal Revenue Code ("IRC") Section 338(g) to step up the tax basis of the 2012 Acquisitions to fair value.  The elections made under Section 338(g) only affect U.S. income taxes (not those of the foreign country where the acquired entities were incorporated).
	It is the Company's intention to repatriate substantially all net income from its wholly owned PRC subsidiary, Dongguan Transpower Electric Products Co., Ltd, a Chinese Limited Liability Company, to its direct Hong Kong parent Transpower Technologies (Hong Kong) Ltd.  Applicable income and dividend withholding taxes have been reflected in the accompanying consolidated statements of operations for the year ended December 31, 2014.  However, U.S. deferred taxes need not be provided as there is no intention to repatriate such amounts to the U.S.    Management's intention is to permanently reinvest the majority of the remaining earnings of foreign subsidiaries in the expansion of its foreign operations.  Unrepatriated earnings, upon which U.S. income taxes have not been accrued, are approximately $126.6 million at December 31, 2014.  Such unrepatriated earnings are deemed by management to be permanently reinvested.  At December 31, 2014, the estimated federal income tax liability (net of estimated foreign tax credits) related to unrepatriated foreign earnings is $32.4 million under the current tax law.
	Components of deferred income tax assets are as follows:
		December 31,
	2014			2013
	Tax Effect			Tax Effect
Deferred tax assets:
State tax credits	$	954		$	1,336
Unfunded pension liability		1,301			668
Reserves and accruals		2,095			2,020
Federal, state and foreign net operating loss
and credit carryforwards		15,361			4,634
Depreciation		962			973
Amortization		995			588
Acquired deferred taxes		10,775			-
Other accruals		3,253			3,303
Total deferred tax assets		35,696			13,522
Deferred tax liabilities:
Reserves and accruals		68			68
Depreciation		707			1,076
Amortization		21,191			4,762
Acquired deferred taxes		8,053			-
Other accruals		1,522			566
Total deferred tax liabilities		31,541			6,472
Valuation allowance		6,692			2,375
Net deferred tax assets/(liabilities)	$	(2,537	)	$	4,675
On December 31, 2013, under the "American Taxpayer Relief Act" ("ATRA"), the Research and Experimentation credit ("R&E") expired.  On December 16, 2014, the R&E credit was extended back to January 1, 2014 and the Company recognized $0.3 million in R&E credits during the fourth quarter of 2014.   During the first quarter of 2013, the Company recognized a $0.4 million R&E credit from 2012 as an increase in the March 31, 2013 quarterly benefit for income taxes.
The Company continues to monitor proposed legislation affecting the taxation of transfers of U.S. intangible property and other potential tax law changes.

Debt

Debt	12 Months Ended
	Dec. 31, 2014
Debt [Abstract]
Debt	10	Debt
	On June 19, 2014, the Company entered into a senior Credit and Security Agreement with KeyBank National Association ("KeyBank"), as administrative agent and lender, which was amended on June 30, 2014 principally to add a syndicate of additional lenders (as so amended, the "Credit and Security Agreement" or "CSA").  The maturity date of the CSA is June 18, 2019.
	The CSA consists of (i) a $50 million revolving credit facility ("Revolver"), (ii) a $145 million term loan facility ("Term Loan") and (iii) a $70 million delayed draw term loan ("DDTL").  Under the terms of the CSA, the Company is entitled, subject to the satisfaction of certain conditions, to request additional commitments under the revolving credit facility or term loans in the aggregate principal amount of up to $100 million to the extent that existing or new lenders agree to provide such additional commitments and/or term loans.
	The obligations of the Company under the CSA are guaranteed by certain of the Company's material U.S. subsidiaries (together with the Company, the "Loan Parties") and are secured by a first priority security interest in substantially all of the existing and future personal property of the Loan Parties, certain material real property of the Loan Parties and certain of the Loan Parties' material U.S. subsidiaries, including 65% of the voting capital stock of certain of the Loan Parties' direct foreign subsidiaries.
	The borrowings under the CSA will bear interest at a rate equal to, at the Company's option, either (1) LIBOR, plus a margin ranging from 1.75% per annum to 3.00% per annum depending on the Company's leverage ratio, or (2)(a) an "Alternate Base Rate," which is the highest of (i) the federal funds rate plus 0.50%, (ii) KeyBank's prime rate and (iii) the LIBOR rate with a maturity of one month plus 1.00%, plus (b) a margin ranging from 0.75% per annum to 2.00% per annum, depending on the Company's leverage ratio. The interest rate in effect at December 31, 2014 was 2.94%, which consists of LIBOR of 0.19% plus the Company's margin of 2.75%.
	The CSA contains customary representations and warranties, covenants and events of default and financial covenants that measure (i) the ratio of the Company's total funded indebtedness, on a consolidated basis, to the amount of the Company's consolidated EBITDA, as defined, ("Leverage Ratio") and (ii) the ratio of the amount of the Company's consolidated EBITDA to the Company's consolidated fixed charges ("Fixed Charge Coverage Ratio"). If an event of default occurs, the lenders under the CSA would be entitled to take various actions, including the acceleration of amounts due thereunder and all actions permitted to be taken by a secured creditor.  At December 31, 2014, the Company was in compliance with its debt covenants, including its most restrictive covenant, the Leverage Ratio.  The unused credit available under the credit facility at December 31, 2014 was $27.0 million, of which we had the ability to borrow $16.2 million without violating our Leverage Ratio covenant based on the Company's existing consolidated EBITDA.
	Concurrent with its entry into the CSA on June 19, 2014, the Company borrowed $145.0 million under the Term Loan to complete its acquisition of Power Solutions.  In July 2014, in connection with the acquisition of Connectivity Solutions, the Company borrowed an additional $90.0 million under the CSA ($70.0 million through the DDTL and $20.0 million under the Revolver).  During the year ended December 31, 2014, the Company recorded $5.8 million in deferred financing costs which will be amortized over the five-year term, and incurred $4.0 million of interest expense.  At December 31, 2014, borrowings outstanding related solely to the $145.0 million Term Loan, the $70.0 million DDTL and $23.0 million under the revolver.
	Scheduled principal payments of the long-term debt outstanding at December 31, 2014 are as follows (in thousands):
	2015		$	13,438
	2016			16,125
	2017			18,812
	2018			24,188
	2019			160,062
	Total long-term debt			232,625
	Less: Current maturities of long-term debt			(13,438	)
	Noncurrent portion of long-term debt		$	219,187
	At December 31, 2013, the Company maintained a $30 million line of credit with Bank of America (the "Credit Agreement"), which was due to expire on October 14, 2016.  At December 31, 2013, the borrowings under the line of credit amounted to $12.0 million and the balance available under the Credit Agreement was $18.0 million.  The Credit Agreement bore interest at LIBOR plus 1.00% to 1.50% based on certain financial statement ratios maintained by the Company.  The interest rate in effect on the borrowings outstanding at December 31, 2013 was 1.4%.  The Company incurred interest expense of less than $0.1 million and $0.2 million related to the borrowings under the Credit Agreement during the years ended December 31, 2014 and 2013, respectively.  Under the terms of the Credit Agreement, the Company was required to maintain certain financial ratios and comply with other financial conditions.  During the year ended December 31, 2014, the Company repaid the full $12.0 million balance outstanding and terminated the Credit Agreement.

Accrued_Expenses

Accrued Expenses	12 Months Ended
	Dec. 31, 2014
Accrued Expenses [Abstract]
Accrued Expenses	11.     Accrued Expenses
	Accrued expenses consist of the following:
		Year Ended December 31,
		2014			2013
	Sales commissions	$	3,017		$	1,431
	Subcontracting labor		2,217			2,406
	Salaries, bonuses and related benefits		17,964			13,674
	Warranty accrual		6,032			-
	Litigation reserve		-			723
	Other		13,358			4,208
		$	42,588		$	22,442
	A tabular presentation of the activity within the warranty accrual account for the year ended December 31, 2014 is presented below:
		December 31,
		2014
	Beginning balance as of January 1, 2014	$	-
	Warranty accruals acquired in 2014 Acquisitions		4,397
	Charges and costs accrued		3,834
	Adjustments related to pre-existing warranties (including changes in estimates)		(66	)
	Less repair costs incurred		(2,061	)
	Currency translation		(72	)
	Ending balance as of December 31, 2014	$	6,032

Segments

Segments	12 Months Ended
	Dec. 31, 2014
Segments [Abstract]
Segments	12.            Segments
	The Company operates in one industry with three reportable operating segments, which are geographic in nature.  The segments consist of North America, Asia and Europe.  The primary criteria by which financial performance is evaluated and resources are allocated are net sales and income from operations.  The following is a summary of key financial data:
		2014			2013			2012
	Net Sales to External Customers:
	North America	$	217,258		$	116,548		$	126,469
	Asia		201,338			193,647			128,319
	Europe		68,480			38,994			31,806
		$	487,076		$	349,189		$	286,594
	Net Sales:
	North America	$	248,007		$	128,472		$	138,966
	Asia		275,765			225,151			167,756
	Europe		114,748			40,742			33,329
	Less intercompany
	net sales		(151,444	)		(45,176	)		(53,457	)
		$	487,076		$	349,189		$	286,594
	Income (Loss) from Operations:
	North America	$	(4,465	)	$	(1,560	)	$	1,336
	Asia		13,338			15,356			(42	)
	Europe		5,220			1,251			369
		$	14,093		$	15,047		$	1,663
	Total Assets:
	North America	$	311,298		$	117,261		$	84,609
	Asia		254,822			148,780			148,351
	Europe		69,905			42,100			42,229
		$	636,025		$	308,141		$	275,189
	Capital Expenditures:
	North America	$	3,862		$	2,064		$	2,455
	Asia		4,089			4,551			2,003
	Europe		1,091			325			286
		$	9,042		$	6,940		$	4,744
	Depreciation and Amortization Expense:
	North America	$	7,921		$	4,282		$	4,081
	Asia		8,143			6,540			4,076
	Europe		3,682			1,560			956
		$	19,746		$	12,382		$	9,113
	Net Sales – Segment net sales are attributed to individual segments based on the geographic source of the billing for such customer sales.  Intercompany sales include finished products manufactured in foreign countries which are then transferred to the United States and Europe for sale; finished goods manufactured in the United States which are transferred to Europe and Asia for sale; and semi-finished components manufactured in the United States which are sold to Asia for further processing. Income (loss) from operations represents net sales less operating costs and expenses.
	The following items are included in the segment data presented above:
	Recent Acquisitions – At December 31, 2014, Power Solutions' total assets of $203.7 million and Connectivity Solutions' total assets of $133.1 million are included in the table above.  See Note 2, Acquisitions, for further information on the 2014 Acquisitions.
	The acquisitions in 2012-2014 contributed to Bel's segment sales and income from operations as follows:
		Year Ended
		December 31,
		2014			2013			2012
	Sales to External Customers:
	North America:
	Power Solutions	$	73,530		$	-		$	-
	Connectivity Solutions		28,242			-			-
	Array		6,842			2,074			-
			108,614			2,074			-
	Asia:
	Power Solutions		3,401			-			-
	Connectivity Solutions		2,469			-			-
	TRP		66,082			65,141			-
			71,952			65,141			-
	Europe:
	Power Solutions		23,882			-			-
	Connectivity Solutions		2,812			-			-
	TRP		2,498			1,407			-
	GigaCom		8			4			57
	Fibreco		6,197			7,483			2,062
	Powerbox		2,901			3,252			1,083
			38,298			12,146			3,202
	Net sales from 2012-2014 acquisitions		218,864			79,361			3,202
	Income (loss) from operations:
	North America:
Power Solutions		(712	)		-			-
Connectivity Solutions		(2,808	)		-			-
Array		(801	)		(936	)		-
		(4,321	)		(936	)		-
Asia:
Power Solutions		(3,603	)		-			-
Connectivity Solutions		493			-			-
TRP		13,152			9,007			-
		10,042			9,007			-
Europe:
Power Solutions		4,882			-			-
Connectivity Solutions		(167	)		-			-
TRP		366			289			-
GigaCom		(23	)		(986	)		(392	)
Fibreco		817			2,101			297
Powerbox		(1,869	)		(392	)		10
		4,006			1,012			(85	)
Total income (loss) from operations
from 2012-2014 acquisitions	$	9,727		$	9,083		$	(85	)
Restructuring Charges – The following restructuring charges are included in income (loss) from operations by segment.  See Note 3, Restructuring Activities, for further information on the Company's restructuring efforts.
	2014			2013			2012
North America	$	1,539		$	963		$	4,558
Asia		-			249			612
Europe		293			175			75
	$	1,832		$	1,387		$	5,245
Entity-Wide Information
The following is a summary of entity-wide information related to the Company's net sales to external customers by geographic area and by major product line.
	2014			2013			2012
Net Sales by Geographic Location:
United States	$	217,258		$	116,548		$	126,469
Macao		195,469			193,647			128,319
United Kingdom		22,852			16,538			13,203
Germany		18,663			16,585			14,165
Switzerland		15,236			-			-
All other foreign countries		17,598			5,871			4,438
Consolidated net sales	$	487,076		$	349,189		$	286,594
Net Sales by Major Product Line:
Connectivity solutions	$	152,954		$	111,653		$	109,245
Magnetic solutions		174,255			170,166			100,529
Power solutions and protection		159,867			67,370			76,820
Consolidated net sales	$	487,076		$	349,189		$	286,594
The following is a summary of long-lived assets by geographic area as of December 31, 2014 and 2013:
	2014			2013
Long-lived Assets by Geographic Location:
United States	$	43,932		$	30,102
People's Republic of China (PRC)		43,174			20,985
Slovakia		9,675			-
Switzerland		3,321			-
United Kingdom		2,536			1,802
All other foreign countries		1,723			1,455
Consolidated long-lived assets	$	104,361		$	54,344
Long-lived assets consist of property, plant and equipment, net and other assets of the Company that are identified with the operations of each geographic area.
The territory of Hong Kong became a Special Administrative Region ("SAR") of the PRC in the middle of 1997. The territory of Macao became a SAR of the PRC at the end of 1999. Management cannot presently predict what future impact this will have on the Company, if any, or how the political climate in the PRC will affect the Company's contractual arrangements in the PRC.  A significant portion of the Company's manufacturing operations and approximately 35.1% of its identifiable assets are located in Asia.
Net Sales to Major Customers
The Company had sales to one customer in excess of ten percent of consolidated net sales in 2014.  The revenue associated with this customer was $76.4 million in 2014 (15.7% of sales). The Company had sales to two customers in excess of ten percent of consolidated net sales in each of 2013 and 2012.  The combined revenue from these two customers was $103.3 million (29.6% of total sales) during the year ended December 31, 2013 and $70.6 million (24.6% of total sales) during the year ended December 31, 2012.  Sales related to these significant customers were primarily reflected in the Asia operating segments during each of the three years discussed.

Retirement_Fund_and_Profit_Sha

Retirement Fund and Profit Sharing Plan	12 Months Ended
	Dec. 31, 2014
Retirement Fund and Profit Sharing Plan [Abstract]
Retirement Fund and Profit Sharing Plan	13.        Retirement Fund and Profit Sharing Plan
	The Company maintains the Bel Fuse Inc. Employees' Savings Plan, a defined contribution plan that is intended to meet the applicable requirements for tax-qualification under sections 401(a) and (k) of the Internal Revenue Code of 1986, as amended (the "Code"). The Employees' Savings Plan allows eligible employees to voluntarily contribute a percentage of their eligible compensation, subject to Code limitations, which contributions are matched by the Company. For plan years beginning on and after January 1, 2012, the Company's matching contributions are made in cash and are equal to 100% of the first 1% of compensation contributed by participants, and 50% of the next 5% of compensation contributed by participants. Prior to January 1, 2012, the Company's matching and profit sharing contributions were made in the form of shares of Bel Fuse Inc. Class A and Class B common stock. The expense for the years ended December 31, 2014, 2013 and 2012 amounted to $0.8 million, $0.4 million and $0.5 million, respectively. As of December 31, 2014, the plan owned 14,523 and 178,239 shares of Bel Fuse Inc. Class A and Class B common stock, respectively.
	The Company's subsidiaries in Asia have a retirement fund covering substantially all of their Hong Kong based full-time employees.  Eligible employees contribute up to 5% of salary to the fund.  In addition, the Company must contribute a minimum of 5% of eligible salary, as determined by Hong Kong government regulations.  The Company currently contributes 7% of eligible salary in cash or Company stock.  The expense for the years ended December 31, 2014, 2013 and 2012 amounted to approximately $0.3 million in each year. As of December 31, 2014, the plan owned 3,323 and 17,342 shares of Bel Fuse Inc. Class A and Class B common stock, respectively.
	The SERP is designed to provide a limited group of key management and highly compensated employees of the Company with supplemental retirement and death benefits.  Participants in the SERP are selected by the Compensation Committee of the Board of Directors.   The SERP initially became effective in 2002 and was amended and restated in April 2007 to conform with applicable requirements of Section 409A of the Internal Revenue Code and to modify the provisions regarding benefits payable in connection with a change in control of the Company.  The Plan is unfunded.  Benefits under the SERP are payable from the general assets of the Company, but the Company has established a rabbi trust which includes certain life insurance policies in effect on participants as well as other investments to partially cover the Company's obligations under the Plan.  See Note 6, Other Assets, for further information on these assets.
	The benefits available under the Plan vary according to when and how the participant terminates employment with the Company.  If a participant retires (with the prior written consent of the Company) on his normal retirement date (65 years old, 20 years of service, and 5 years of Plan participation), his normal retirement benefit under the Plan would be annual payments equal to 40% of his average base compensation (calculated using compensation from the highest five consecutive calendar years of Plan participation), payable in monthly installments for the remainder of his life.  If a participant retires early from the Company (55 years old, 20 years of service, and five years of Plan participation), his early retirement benefit under the Plan would be an amount (i) calculated as if his early retirement date were in fact his normal retirement date, (ii) multiplied by a fraction, with the numerator being the actual years of service the participant has with the Company and the denominator being the years of service the participant would have had if he had retired at age 65, and (iii) actuarially reduced to reflect the early retirement date.  If a participant dies prior to receiving 120 monthly payments  under  the  Plan,  his  beneficiary  would  be  entitled  to  continue  receiving benefits for the shorter of (i) the time necessary to complete 120 monthly payments or (ii) 60 months.  If a participant dies while employed by the Company, his beneficiary would receive, as a survivor benefit, an annual amount equal to (i) 100% of the participant's annual base salary at date of death for one year, and (ii) 50% of the participant's annual base salary at date of death for each of the following four years, each payable in monthly installments.  The Plan also provides for disability benefits, and a forfeiture of benefits if a participant terminates employment for reasons other than those contemplated under the Plan. The expense related to the Plan for the years ended December 31, 2014, 2013 and 2012 amounted to $1.3 million, $1.3 million and $1.1 million, respectively.
	Net Periodic Benefit Cost
	The net periodic benefit cost related to the SERP consisted of the following components during the years ended December 31, 2014, 2013 and 2012:
		2014			2013			2012
	Service Cost	$	542		$	556		$	438
	Interest Cost		541			448			417
	Net amortization		182			307			230
	Net periodic benefit cost	$	1,265		$	1,311		$	1,085
	Obligations and Funded Status
	Summarized information about the changes in plan assets and benefit obligation, the funded status and the amounts recorded at December 31, 2014 and 2013 are as follows:
		2014			2013
	Fair value of plan assets, January 1	$	-		$	-
	Company contributions		16			-
	Benefits paid		(16	)		-
	Fair value of plan assets, December 31	$	-		$	-
	Benefit obligation, January 1		10,830			11,045
	Service cost		542			556
	Interest cost		541			448
	Plan amendments		-			502
	Benefits paid		(16	)		-
	Actuarial (gains) losses		2,308			(1,721	)
	Benefit obligation, December 31	$	14,205		$	10,830
	Underfunded status, December 31	$	(14,205	)	$	(10,830	)
	The Company has recorded the 2014 and 2013 underfunded status as a long-term liability on the consolidated balance sheets.  The plan amendment in 2013 noted in the table above relates to a decision by Bel's Board of Directors to grant past service to certain of the plan participants.  The accumulated benefit obligation for the SERP was $12.1 million as of December 31, 2014 and $9.2 million as of December 31, 2013.  The aforementioned company-owned life insurance policies and marketable securities held in a rabbi trust had a combined fair value of $12.3 million and $11.9 million at December 31, 2014 and 2013, respectively.  See Note 6, Other Assets, for additional information on these investments.
	The estimated net loss and prior service cost for the defined benefit pension plan that will be amortized from accumulated other comprehensive loss into net periodic benefit cost over the next fiscal year is $0.4 million.  The Company expects to make contributions of $0.1 million to the SERP in 2015.  The Company had no net transition assets or obligations recognized as an adjustment to other comprehensive income and does not anticipate any plan assets being returned to the Company during 2015, as the plan has no assets.
	The following benefit payments, which reflect expected future service, are expected to be paid:
	Years Ending
	December 31,
	2015		$	63
	2016			267
	2017			267
	2018			267
	2019			477
	2020 - 2024			3,876
	The following gross amounts are recognized net of tax in accumulated other comprehensive loss:
		2014			2013
	Prior service cost	$	1,048		$	1,230
	Net loss		3,302			1,004
		$	4,350		$	2,234
	Actuarial Assumptions
	The weighted average assumptions used in determining the periodic net cost and benefit obligation information related to the SERP are as follows:
		2014			2013			2012
	Net periodic benefit cost
	Discount rate		5	%		4	%		4.5	%
	Rate of compensation increase		3	%		3	%		3	%
	Benefit obligation
	Discount rate		4	%		5	%		4	%
	Rate of compensation increase		3	%		3	%		3	%

Sharebased_Compensation

Share-based Compensation	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Share-based Compensation	14.  Share-based Compensation
	The Company has an equity compensation program (the "Program") which provides for the granting of "Incentive Stock Options" within the meaning of Section 422 of the Internal Revenue Code of 1986, as amended, non-qualified stock options and restricted stock awards.  The Company believes that such awards better align the interest of its employees with those of its shareholders.  The 2011 Equity Compensation Plan provides for the issuance of 1.4 million shares of the Company's Class B common stock.  At December 31, 2014, 766,500 shares remained available for future issuance under the 2011 Equity Compensation Plan.
	The Company records compensation expense in its consolidated statements of operations related to employee stock-based options and awards.  The aggregate pretax compensation cost recognized for stock-based compensation amounted to approximately $2.7 million, $1.9 million and $1.8 million for the years ended December 31, 2014, 2013 and 2012, respectively, and related solely to restricted stock awards.   The Company did not use any cash to settle any equity instruments granted under share-based arrangements during the years ended December 31, 2014, 2013 and 2012.  At December 31, 2014 and 2013, the only instruments issued and outstanding under the Program related to restricted stock awards.
	Restricted Stock Awards
	The Company provides common stock awards to certain officers and key employees.  The Company grants these awards, at its discretion, from the shares available under the Program.  Unless otherwise provided at the date of grant or unless subsequently accelerated, the shares awarded are earned in 25% increments on the second, third, fourth and fifth anniversaries of the award, respectively, and are distributed provided the employee has remained employed by the Company through such anniversary dates; otherwise the unearned shares are forfeited.  The market value of these shares at the date of award is recorded as compensation expense on the straight-line method over the five-year periods from the respective award dates, as adjusted for forfeitures of unvested awards. During 2014, 2013 and 2012, the Company issued 378,000 shares, 162,200 shares and 130,000 shares of the Company's Class B common stock, respectively, under a restricted stock plan to various officers and employees.
	A summary of the restricted stock activity under the Program as of December 31, 2014 is presented below:
	Restricted Stock				Weighted Average		Weighted Average
							Remaining
	Awards	Shares			Award Price		Contractual Term
	Outstanding at January 1, 2014		412,350		$	18.85	3.4 years
	Granted		378,000			23.57
	Vested		(120,175	)		18.69
	Forfeited		(26,900	)		22.03
	Outstanding at December 31, 2014		643,275		$	21.52	3.8 years
	As of December 31, 2014, there was $10.0 million of total pretax unrecognized compensation cost included within additional paid-in capital related to non-vested stock based compensation arrangements granted under the restricted stock award plan.  That cost is expected to be recognized over a period of 4.6 years.
	The Company's policy is to issue new shares to satisfy restricted stock awards.  Currently the Company believes that substantially all restricted stock awards will vest.

Common_Stock

Common Stock	12 Months Ended
	Dec. 31, 2014
Common Stock [Abstract]
Common Stock	15.        Common Stock
	In July 2012, the Board of Directors of the Company authorized the purchase of up to $10 million of the Company's outstanding Class B common shares.  As of December 31, 2012, the Company had purchased and retired 368,723 Class B common shares at a cost of approximately $6.6 million.  As of December 31, 2013, the Company had cumulatively purchased and retired 547,366 Class B common shares at a cost of approximately $10.0 million.  No shares of Class A or Class B common stock were repurchased during the year ended December 31, 2014.
	As of December 31, 2014, according to regulatory filings, there were two shareholders of the Company's common stock (other than shareholders subject to specific exceptions) with ownership in excess of 10% of Class A outstanding shares with no ownership of the Company's Class B common stock.  In accordance with the Company's certificate of incorporation, the Class B Protection clause is triggered if a shareholder owns 10% or more of the outstanding Class A common stock and does not own an equal or greater percentage of all then outstanding shares of both Class A and Class B common stock (all of which common stock must have been acquired after the date of the 1998 recapitalization).  In such a circumstance, such shareholder must, within 90 days of the trigger date, purchase Class B common shares, in an amount and at a price determined in accordance with a formula described in the Company's certificate of incorporation, or forfeit its right to vote its Class A common shares.  As of December 31, 2014, to the Company's knowledge, these shareholders had not purchased any Class B shares to comply with these requirements.  In order to vote their shares at Bel's next shareholders' meeting, these shareholders must either purchase the required number of Class B common shares or sell or otherwise transfer Class A common shares until their Class A holdings are under 10%.  As of December 31, 2014, to the Company's knowledge, these shareholders owned 23.5% and 11.0%, respectively, of the Company's Class A common stock in the aggregate and had not taken steps to either purchase the required number of Class B common shares or sell or otherwise transfer Class A common shares until their Class A holdings fall below 10%.  Unless and until this situation is satisfied in a manner permitted by the Company's Restated Certificate of Incorporation, the subject shareholders will not be permitted to vote their shares of common stock.
	Throughout 2014, 2013 and 2012, the Company declared dividends on a quarterly basis at a rate of $0.06 per Class A share of common stock and $0.07 per Class B share of common stock.  The Company declared dividends totaling $3.2 million in 2014, $3.1 million in 2013 and $3.2 million in 2012.  There are no contractual restrictions on the Company's ability to pay dividends provided the Company is not in default under its credit agreements immediately before such payment and after giving effect to such payment.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies [Abstract]
Commitments and Contingencies	16.        Commitments and Contingencies
	Leases
	The Company leases various facilities under operating leases expiring through December 2023.  Some of these leases require the Company to pay certain executory costs (such as insurance and maintenance).
	Future minimum lease payments for operating leases are approximately as follows:
	Year Ending
	December 31,
	2015	$	8,295
	2016		5,972
	2017		4,472
	2018		2,164
	2019		1,940
	Thereafter		4,025
		$	26,868
	Rental expense for all leases was approximately $7.5 million, $4.9 million and $3.4 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	Other Commitments
	The Company submits purchase orders for raw materials to various vendors throughout the year for current production requirements, as well as forecasted requirements.  Certain of these purchase orders relate to special purpose material and, as such, the Company may incur penalties if an order is cancelled.  The Company had outstanding purchase orders related to raw materials in the amount of $50.4 million and $23.4 million at December 31, 2014 and December 31, 2013, respectively.  The Company also had outstanding purchase orders related to capital expenditures in the amount of $3.7 million and $3.0 million at December 31, 2014 and December 31, 2013, respectively.
	Legal Proceedings
	The Company was a defendant in a lawsuit captioned SynQor, Inc. v. Artesyn Technologies, Inc., et al. brought in the United States District Court, Eastern District of Texas in November 2007 ("SynQor I case").  The plaintiff alleged that eleven defendants, including Bel, infringed its patents covering certain power products. With respect to the Company, the plaintiff claimed that the Company infringed its patents related to unregulated bus converters and/or point-of-load (POL) converters used in intermediate bus architecture power supply systems. The case initially went to trial in December 2010.  A decision was ultimately rendered in November 2013 in favor of the plaintiff, and the Company released a payment to SynQor of $10.9 million.  The Company subsequently received a $2.1 million payment from one of its customers related to an indemnification agreement and reimbursement of certain legal fees.
	In a related matter, on September 29, 2011, the United States District Court for the Eastern District of Texas ordered SynQor, Inc.'s continuing causes of action for post-verdict damages to be severed from the original action and assigned to a new case number.  The new action captioned SynQor, Inc. v. Artesyn Technologies, Inc., et al. (Case Number 2:11cv444) is a patent infringement action for damages in the form of lost profits and reasonable royalties for the period beginning January 24, 2011 ("SynQor II case").  SynQor, Inc. also seeks enhanced damages.  The Company has an indemnification agreement in place with one of its customers specifically covering post-verdict damages related to this case.  This case went to trial on July 30, 2013.  In April 2014, a final judgment was rendered in this case, whereby the Company was assessed an additional $0.7 million in post-verdict damages.  This amount was paid by the Company in July 2014 and was subsequently reimbursed by one of its customers under the terms of the indemnification agreement referenced above.  SynQor filed an appeal of the final judgment in May 2014, which is currently pending with the CAFC. The CAFC heard oral arguments from the parties on this matter on March 2, 2015. The Court is expected to render its decision in the June-July 2015 timeframe.
	The Company is a plaintiff in a lawsuit captioned Bel Fuse Inc. et al. v. Molex Inc. brought in the United District Court of New Jersey in April 2013.  The Company claims that Molex infringed three of the Company's patents related to integrated magnetic connector products.  Molex filed a motion to dismiss the complaint on August 6, 2013.  The Company filed an amended complaint and response on August 20, 2013.  Molex withdrew its original Motion to Dismiss and filed a second, revised Motion to Dismiss on September 6, 2013.  The Company filed its response on October 7, 2013.  The Court denied Molex's revised Motion to Dismiss on June 16, 2014.  In June 2014, Molex initiated an Inter Partes Review (IPR) at the U.S. Patent and Trademark Office for one of the three patents associated with this case.  The Company and Molex executed an agreement in September 2014 to terminate the IPR and to withdraw one of the patents from the district court litigation.  The case continues to proceed in the district court and now involves two of the Company's patents related to integrated magnetic connector products.
	In connection with the acquisition of Power Solutions, there is an ongoing claim by the Arezzo Revenue Agency in Italy concerning certain tax matters related to what was then Power-One Asia Pacific Electronics Shenzhen Co. Ltd. (now Bel Power Solutions Asia Pacific Electronics Shenzhen Co. Ltd, or "BPS China") for the years 2004 to 2006.  In September 2012, the Tax Court of Arezzo ruled in favor of BPS China and cancelled the claim.  In February 2013, the Arezzo Revenue Agency filed an appeal of the Tax Court's ruling. The hearing of the appeal was held on October 2, 2014.  On October 13, 2014, BPS China was informed of the Regional Tax Commission of Florence ruling which was in favor of the Arezzo Revenue Agency and against BPS China.  The estimated liability related to this matter is approximately $12.0 million and has been included as a liability for uncertain tax positions on the accompanying consolidated balance sheet.  As Bel is fully indemnified in this matter per the terms of the stock purchase agreement with ABB, an offsetting indemnification asset is also reflected in other assets on the accompanying consolidated balance sheet at December 31, 2014.
	The Company, through its subsidiary Cinch Connectors Inc., is a defendant in an asbestos lawsuit captioned Richard Skrzypek vs. Adience Inc., et al. The lawsuit was filed in the Circuit Court for the County of Wayne in the State of Michigan. The complaint was amended to include Cinch Connectors Inc. and other defendants on November 13, 2014. The Company filed its answer to the complaint on January 23, 2015.
	The Company is not a party to any other legal proceeding, the adverse outcome of which is likely to have a material adverse effect on the Company's consolidated financial condition or results of operations.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive (Loss) Income	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive (Loss) Income [Abstract]
Accumulated Other Comprehensive (Loss) Income	17.            Accumulated Other Comprehensive (Loss) Income
	The components of accumulated other comprehensive (loss) income as of December 31, 2014 and 2013 are summarized below:
			2014			2013				2012
	Foreign currency translation adjustment		$	(9,365	)	$	1,904			$	927
	Unrealized holding gain on available-for-sale
	securities, net of taxes of $259, $169 and $161 as of
	December 31, 2014, 2013 and 2012			429			282				256
	Unfunded SERP liability, net of taxes of ($1,325), ($693)
	and ($1,151) as of December 31, 2014, 2013 and 2012			(3,026	)		(1,541	)			(2,610	)
	Accumulated other comprehensive (loss) income		$	(11,962	)	$	645			$	(1,427	)
	Changes in accumulated other comprehensive (loss) income by component during the year ended December 31, 2014 are as follows.  All amounts are net of tax.
						Unrealized Holding
			Foreign Currency			Gains on
			Translation			Available-for-					Unfunded
			Adjustment			Sale Securities					SERP Liability				Total
	Balance at January 1, 2013		$	927		$	256				$	(2,610	)		$	(1,427	)
	Other comprehensive income before reclassifications			977			87					761				1,825
	Amounts reclassified from accumulated other
	comprehensive income (loss)			-			(61	)	(a)			308		(b)		247
	Net current period other comprehensive income			977			26					1,069				2,072
	Balance at December 31, 2013			1,904			282					(1,541	)			645
	Other comprehensive income (loss) before reclassifications			(11,269	)		147					(1,667	)			(12,789	)
	Amounts reclassified from accumulated other
	comprehensive income (loss)			-			-					182		(b)		182
	Net current period other comprehensive income (loss)			(11,269	)		147					(1,485	)			(12,607	)
	Balance at December 31, 2014		$	(9,365	)	$	429				$	(3,026	)		$	(11,962	)
	(a)	This reclassification relates to the gain on sale of SERP investments during the third quarter of 2013.  This is reflected as a gain on sale of investment in the consolidated statements of operations.
	(b)	This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP plan.  This expense is allocated between cost of sales and selling, general and administrative expense based upon the employment classification of the plan participants.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	18.            Related Party Transactions
	The Company maintains minority ownership in a joint venture in the PRC.  See Note 2, Acquisitions.  The joint venture may purchase raw components and other goods from the Company and may sell finished goods to the Company as well as to other third parties.  The Company paid $4.3 million for inventory purchased from the joint venture during the period from its acquisition date of June 19, 2014 through December 31, 2014.  At December 31, 2014, the Company owed the joint venture approximately $0.9 million, which is included in accounts payable on the accompanying consolidated balance sheet.

Selected_Quarterly_Financial_D

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Data (Unaudited) [Abstract]
Selected Quarterly Financial Data (Unaudited)	19.            Selected Quarterly Financial Data (Unaudited)
	Quarterly results for the year ended December 31, 2014 and 2013 are summarized as follows:
		2014
		First			Second		Third		Fourth
		Quarter			Quarter		Quarter		Quarter
	Net sales	$	82,646		$	99,439	$	156,341	$	148,650
	Cost of sales		68,576			81,493		128,250		120,781
	Net earnings		2,503			3,065		1,507		2,020
	Net earnings per share:
	Class A common share - basic and diluted	$	0.2		$	0.25	$	0.12	$	0.16
	Class B common share - basic and diluted	$	0.22		$	0.27	$	0.13	$	0.17
		2013
		First			Second		Third		Fourth
		Quarter			Quarter		Quarter		Quarter
	Net sales	$	63,028		$	93,981	$	101,164	$	91,016
	Cost of sales		53,932			78,724		81,136		73,160
	Net (loss) earnings		(558	)		1,689		7,380		7,397
	(Loss) earnings per share:
	Class A common share - basic and diluted	$	(0.05	)	$	0.14	$	0.62	$	0.61
	Class B common share - basic and diluted	$	(0.05	)	$	0.15	$	0.65	$	0.65

Subsequent_Event

Subsequent Event	12 Months Ended
	Dec. 31, 2014
Subsequent Event [Abstract]
Subsequent Event	20.            Subsequent Event
	On January 23, 2015, the Company completed its sale of the Network Power Systems ("NPS") business of the recently acquired Power Solutions business to Unipower LLC ("Unipower") for $9.0 million in cash plus $1.0 million in escrow pending realization of certain sales targets.  The net proceeds from the sale were used to repay outstanding borrowings in accordance with the provisions of the Credit and Security Agreement.  The transaction provides that Bel will move processes and people to Unipower under an interim transition agreement.  Bel will also continue to manufacture the NPS products for up to 24 months under a manufacturing services agreement.

SCHEDULE_II_VALUATION_AND_QUAL

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Dec. 31, 2014
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS [Abstract]
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS	BEL FUSE INC. AND SUBSIDIARIES
	SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
	(Amounts in thousands)
	Column A	Column B		Column C						Column D			Column E
				Additions
		Balance at		-1			-2						Balance
		beginning		Charged to costs			Charged to other			Deductions			at end
	Description	of period		and expenses			accounts (b)			(a)			of period
	Year ended December 31, 2014:
	Allowance for doubtful accounts	$	941	$	1,434		$	-		$	(386	)	$	1,989
	Allowance for excess and obsolete inventory	$	3,941	$	4,438		$	(1	)	$	(1,569	)	$	6,809
	Deferred tax assets - valuation allowances	$	1,955	$	4,766		$	-		$	(29	)	$	6,692
	Year ended December 31, 2013:
	Allowance for doubtful accounts	$	743	$	325		$	50		$	(177	)	$	941
	Allowance for excess and obsolete inventory	$	5,490	$	(85	)	$	7		$	(1,471	)	$	3,941
	Deferred tax assets - valuation allowances	$	1,874	$	308		$	-		$	(227	)	$	1,955
	Year ended December 31, 2012:
	Allowance for doubtful accounts	$	771	$	(123	)	$	109		$	(14	)	$	743
	Allowance for excess and obsolete inventory	$	4,776	$	1,345		$	3		$	(634	)	$	5,490
	Deferred tax assets - valuation allowances	$	1,232	$	651		$	-		$	(9	)	$	1,874
	(a)  Write-offs
	(b) Includes foreign currency translation adjustments

DESCRIPTION_OF_BUSINESS_AND_SU1

DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2014
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Principles of Consolidation	Principles of Consolidation - The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, including businesses acquired since their respective dates of acquisition.  All intercompany transactions and balances have been eliminated.
Use of Estimates	Use of Estimates - The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP") requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an on-going basis, we evaluate our estimates, including but not limited to those related to product returns, provisions for bad debt, inventories, goodwill, intangible assets, investments, Supplemental Executive Retirement Plan ("SERP") expense, income taxes, contingencies and litigation. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.
Cash Equivalents	Cash Equivalents - Cash equivalents include short-term investments in money market funds and certificates of deposit with an original maturity of three months or less when purchased.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts - We maintain an allowance for doubtful accounts for estimated losses from the inability of our customers to make required payments.  We determine our allowance by both specific identification of customer accounts where appropriate and the application of historical loss experience to non-specific accounts.
Business Combinations	Business Combinations – We  account for business combinations by recognizing the assets acquired, the liabilities assumed, and any noncontrolling interest in the acquiree at the acquisition date, measured at their fair values as of that date, with limited exceptions specified in the accounting literature.  Acquisition-related costs, including restructuring costs,  are recognized separately from the acquisition and will generally be expensed as incurred.
Effects of Foreign Currency	Effects of Foreign Currency – In non-U.S. locations that are not considered highly inflationary, we translate the balance sheets at the end of period exchange rates with translation adjustments accumulated in stockholders' equity on our consolidated balance sheets. We translate the statements of operations at the average exchange rates during the applicable period.
	Most significant expenses, including raw materials, labor and manufacturing expenses, are incurred primarily in U.S. dollars or the Chinese renminbi, and to a lesser extent in British pounds and Mexican pesos.  The Chinese renminbi appreciated by approximately 0.8% in 2014 as compared to 2013.  Future appreciation of the renminbi would result in the Company's incurring higher costs for all expenses incurred in the PRC.  The Company's European entities, whose functional currencies are euros, British pounds and Czech korunas, enter into transactions which include sales which are denominated principally in euros, British pounds and various other European currencies, and purchases that are denominated principally in U.S. dollars and British pounds.  Such transactions resulted in net realized and unrealized currency exchange gains (losses) of $4.3 million, ($0.6) million and $0.6 million for the years ended December 31, 2014, 2013 and 2012, respectively, which were included in net earnings.  Translation of subsidiaries' foreign currency financial statements into U.S. dollars resulted in translation adjustments of ($11.3) million, $1.0 million and $0.3 million for the years ended December 31, 2014, 2013 and 2012, respectively, which are included in accumulated other comprehensive income (loss).
Concentration of Credit Risk	Concentration of Credit Risk - Financial instruments which potentially subject us to concentrations of credit risk consist principally of accounts receivable and temporary cash investments.  We grant credit to customers that are primarily original equipment manufacturers and to subcontractors of original equipment manufacturers based on an evaluation of the customer's financial condition, without requiring collateral.  Exposure to losses on receivables is principally dependent on each customer's financial condition.  We control our exposure to credit risk through credit approvals, credit limits and monitoring procedures and establish allowances for anticipated losses.  See Note 12 for disclosures regarding significant customers.
	We place temporary cash investments with quality financial institutions and commercial issuers of short-term paper and, by policy, limit the amount of credit exposure in any one financial instrument.
Inventories	Inventories - Inventories are stated at the lower of weighted-average cost or market.
Revenue Recognition	Revenue Recognition – Revenue is recognized when the product has been delivered and title and risk of loss has passed to the customer, collection of the resulting receivable is deemed reasonably assured by management, persuasive evidence of an arrangement exists and the sales price is fixed and determinable.  Substantially all of our shipments are FCA (free carrier), which provides for title to pass upon delivery to the customer's freight carrier.  Some product is shipped DDP/DDU with title passing when the product arrives at the customer's dock.  DDP is defined as Delivered Duty Paid by the Company and DDU is Delivered Duty Unpaid by the Company.
	For certain customers, we provide consigned inventory, either at the customer's facility or at a third-party warehouse. Sales of consigned inventory are recorded when the customer withdraws inventory from consignment.
	The Company is not contractually obligated to accept returns except for defective product or in instances where the product does not meet the Company's product specifications.  However, the Company may permit its customers to return product for other reasons.  In these instances, the Company would generally require a significant cancellation penalty payment by the customer.  The Company estimates such returns, where applicable, based upon management's evaluation of historical experience, market acceptance of products produced and known negotiations with customers.  Such estimates are deducted from sales and provided for at the time revenue is recognized.
Product Warranties	Product Warranties – Warranties vary by product line and are competitive for the markets in which the Company operates.  Warranties generally extend for one to three years from the date of sale. The Company reviews its warranty liability quarterly based on an analysis of actual expenses and failure rates accompanied with estimated future costs and projected failure rate trends. Factors taken into consideration when evaluating our warranty reserve are (i) historical claims for each product, (ii) volume increases, (iii) life of warranty, (iv) historical warranty repair costs and (v) other factors. To the extent that actual experience differs from our estimate, the provision for product warranties will be adjusted in future periods. Actual warranty repair costs are charged against the reserve balance as incurred.  See Note 11 of the consolidated financial statements.
Finite-Lived Intangible Assets	Finite-Lived Intangible Assets – Intangible assets with finite lives are stated at cost less accumulated amortization.  Amortization is calculated using the straight-line method over the estimated useful life of the asset.
Goodwill and Other Indefinite-lived Intangible Assets	Goodwill and Other Indefinite-lived Intangible Assets– Goodwill represents the excess of the aggregate of the following (1) consideration transferred, (2) the fair value of any noncontrolling interest in the acquiree and, (3) if the business combination is achieved in stages, the acquisition-date fair value of our previously held equity interest in the acquiree over the net of the acquisition-date amounts of the identifiable assets acquired and the liabilities assumed.
	We evaluate goodwill and other indefinite-lived intangible assets for impairment annually as of October 1 or more frequently if impairment indicators arise in accordance with Accounting Standards Codification ("ASC") Topic 350, "Intangibles – Goodwill and Other".
	The Company tests goodwill for impairment using a fair value approach at the reporting unit level.  A reporting unit is an operating segment or one level below an operating segment for  which discrete financial information is available and reviewed regularly by management.  Our reporting units are geographical in nature and are North America, Asia and Europe.  Assets and liabilities of the Company have been assigned to the reporting units to the extent they are employed in or are considered a liability related to the operations of the reporting unit and are considered in determining the fair value of the reporting unit.  Reporting units with similar economic characteristics are aggregated for purposes of the goodwill impairment test.
	The goodwill impairment test is a two-step process.  If the fair value of a reporting unit exceeds its carrying amount, goodwill of the reporting unit is considered not impaired and the second step of the impairment test is unnecessary.  If the carrying amount of a reporting unit exceeds its fair value, the second step of the goodwill impairment test is performed to measure the amount of impairment loss, if any.  The second step of the goodwill impairment test, used to measure the amount of impairment loss, compares the implied fair value of goodwill associated with each reporting unit with the carrying amount of that goodwill.  If the carrying amount of goodwill associated with a reporting unit exceeds the implied fair value of that goodwill, an impairment loss shall be recognized in an amount equal to that excess.  No impairment was recognized as a result of the October 1, 2014 and 2013  testing.  See Note 4 of the consolidated financial statements.
	The Company tests indefinite-lived intangible assets for impairment using the relief-from-royalty method (a form of the income approach).  No impairment was recognized as a result of the October 1, 2014 testing.  See Note 4 of the consolidated financial statements.
Evaluation of Long-lived Assets	Evaluation of Long-lived Assets –  Management reviews long-lived assets for potential impairment whenever significant events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable.  An impairment exists when the carrying amount of the long-lived asset is not recoverable and exceeds its fair value.  The carrying amount of a long-lived asset is not recoverable if it exceeds the sum of the estimated undiscounted cash flows expected to result from the use and eventual disposition of the asset.  If an impairment exists, the resulting writedown would be the difference between fair market value of the long-lived asset and the related net book value
Depreciation	Depreciation - Property, plant and equipment are stated at cost less accumulated depreciation and amortization.  Depreciation and amortization are calculated primarily using the straight-line method over the estimated useful life of the asset.  The estimated useful lives primarily range from 1 to 39 years for buildings and leasehold improvements, and from 1 to 15 years for machinery and equipment.
Income Taxes	Income Taxes - We account for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the consolidated financial statements.  Under this method, deferred tax assets and liabilities are determined based on the differences between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse.  The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date.
	We record net deferred tax assets to the extent we believe these assets will more-likely-than-not be realized.  In making such determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies and recent financial operations.  We have established  valuation allowances for deferred tax assets that are not likely to be realized.  In the event we were to determine that we would be able to realize our deferred income tax assets in the future in excess of our net recorded amount, we would adjust  the valuation allowance, which would reduce the provision for income taxes.
	We establish reserves for tax contingencies when, despite the belief that our tax return positions are fully supported, it is probable that certain positions may be challenged and may not be fully sustained. The tax contingency reserves are analyzed on a quarterly basis and adjusted based upon changes in facts and circumstances, such as the conclusion of federal and state audits, expiration of the statute of limitations for the assessment of tax, case law and emerging legislation. Our effective tax rate includes the effect of tax contingency reserves and changes to the reserves as considered appropriate by management.
Earnings per Share	Earnings per Share  – We utilize the two-class method to report our earnings per share.  The two-class method is an earnings allocation formula that determines earnings per share for each class of common stock according to dividends declared and participation rights in undistributed earnings.  The Company's Certificate of Incorporation, as amended, states that Class B common shares are entitled to dividends at least 5% greater than dividends paid to Class A common shares, resulting in the two-class method of computing earnings per share.  In computing earnings per share, the Company has allocated dividends declared to Class A and Class B based on amounts actually declared for each class of stock and 5% more of the undistributed earnings have been allocated to Class B shares than to the Class A shares on a per share basis.  Basic earnings per common share are computed by dividing net earnings by the weighted-average number of common shares outstanding during the period.  Diluted earnings per common share, for each class of common stock, are computed by dividing net earnings by the weighted-average number of common shares and potential common shares outstanding during the period. There were no potential common shares outstanding during the years ended December 31, 2014, 2013 or 2012 which would have had a dilutive effect on earnings per share.
	The earnings and weighted average shares outstanding used in the computation of basic and diluted earnings per share are as follows:
		2014		2013		2012
	Numerator:
	Net earnings	$	9,095	$	15,908	$	2,373
	Less dividends declared:
	Class A		522		522		522
	Class B		2,665		2,576		2,697
	Undistributed earnings (loss)	$	5,908	$	12,810	$	(846	)
	Undistributed earnings (loss) allocation - basic and diluted:
	Class A undistributed earnings (loss)	$	1,058	$	2,346	$	(150	)
	Class B undistributed earnings (loss)		4,850		10,464		(696	)
	Total undistributed earnings (loss)	$	5,908	$	12,810	$	(846	)
	Net earnings allocation - basic and diluted:
	Class A net earnings	$	1,580	$	2,868	$	372
	Class B net earnings		7,515		13,040		2,001
	Net earnings	$	9,095	$	15,908	$	2,373
	Denominator:
	Weighted average shares outstanding:
	Class A - basic and diluted		2,175		2,175		2,175
	Class B - basic and diluted		9,491		9,240		9,625
	Net earnings per share:
	Class A - basic and diluted	$	0.73	$	1.32	$	0.17
	Class B - basic and diluted	$	0.79	$	1.41	$	0.21
Research and Development ("R&D")	Research and Development ("R&D") - Our engineering groups are strategically located around the world to facilitate communication with and access to customers' engineering personnel. This collaborative approach enables partnerships with customers for technical development efforts. On occasion, we execute non-disclosure agreements with our customers to help develop proprietary, next generation products destined for rapid deployment.  R&D costs are expensed as incurred, and are included in cost of sales on the consolidated statements of operations. Generally, R&D is performed internally for the benefit of the Company. R&D costs include salaries, building maintenance and utilities, rents, materials, administration costs and miscellaneous other items. R&D expenses for the years ended December 31, 2014, 2013 and 2012 amounted to $21.5 million, $14.1 million and $12.4 million, respectively.  The increase in R&D expense from 2013 to 2014 was primarily due to the inclusion of R&D expense related to the recently-acquired businesses of Power Solutions and Connectivity Solutions.
Fair Value Measurements	Fair Value Measurements - We utilize the accounting guidance for fair value measurements and disclosures for all financial assets and liabilities and nonfinancial assets and liabilities that are recognized or disclosed at fair value in the consolidated financial statements on a recurring basis or on a nonrecurring basis during the reporting period.  The fair value is an exit price, representing the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants based upon the best use of the asset or liability at the measurement date.  The Company utilizes market data or assumptions that market participants would use in pricing the asset or liability.  The accounting guidance establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value.  These tiers are defined as follows:
	Level 1 -  Observable inputs such as quoted market prices in active markets
	Level 2 -  Inputs other than quoted prices in active markets that are either directly or indirectly observable
	Level 3 - Unobservable inputs about which little or no market data exists, therefore requiring an entity to develop its own assumptions
	For financial instruments such as cash and cash equivalents, accounts receivable, accounts payable, accrued expenses and notes payable, the carrying amount approximates fair value because of the short maturities of such instruments.  See Note 5 for additional disclosures related to fair value measurements.
Recently Issued Accounting Standards	Recently Issued Accounting Standards
	Recently Adopted Accounting Standards
	In November 2014, the FASB issued guidance on pushdown accounting for business combinations.  This amendment provides an acquired entity with an option to apply pushdown accounting in its separate financial statements upon occurrence of an event in which an acquirer obtains control of the acquired entity.  This amendment is effective on November 18, 2014.  The effects of this standard will depend on any future events whereby we obtain control of an entity and elect to apply pushdown accounting.
	In July 2013, the FASB issued revised guidance to address the diversity in practice related to the financial statement presentation of unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The Company adopted this guidance as of January 1, 2014, on a prospective basis. The adoption did not have a material impact on the Company's consolidated financial statements.
	Accounting Standards Issued But Not Yet Adopted
	In January 2015, the FASB issued guidance on simplifying the income statement presentation by eliminating the concept of extraordinary items.  Extraordinary items are events and transactions that are distinguished by their unusual nature and by the infrequency of their occurrence.  Eliminating the extraordinary classification simplifies income statement presentation by altogether removing the concept of extraordinary items from consideration.  This amendment is effective for annual periods beginning after December 15, 2015.  The adoption of this standard is not expected to have a material impact on our consolidated financial position or results of operations.
	In August 2014, the FASB issued guidance on the presentation of financial statements when there is substantial doubt about an entity's ability to continue as a going concern. The amendment requires that an entity's management evaluate whether there are conditions or events, considered in the aggregate, that raise substantial doubt about the entity's ability to continue as a going concern within one year after the date that the financial statements are issued. If conditions or events raise substantial doubt about an entity's ability to continue as a going concern, additional disclosure is required to enable users of the financial statements to understand the conditions or events, management's evaluation of the significance of those conditions and management's plans that are intended to alleviate or management's plans that have alleviated substantial doubt. The amendment is effective for annual periods ending after December 15, 2016, and for annual periods and interim periods thereafter. Early application is permitted. Management does not believe that the adoption of this guidance will have any material impact on the Company's consolidated financial position or results of operations.
	In June 2014, the FASB issued guidance on stock compensation.  The amendment requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition.  A reporting entity should apply existing guidance in Topic 718 as it relates to awards with performance conditions that affect vesting to account for such awards.  Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered.  The amendment is effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2015.  Earlier adoption is permitted.  Management does not believe that the adoption of this guidance will have any material impact on the Company's consolidated financial position or results of operations.
	In May 2014, the FASB issued guidance on the accounting for revenue from contracts with customers that will supersede most existing revenue recognition guidance, including industry-specific guidance. The core principle requires an entity to recognize revenue to depict the transfer of goods and services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In addition, the guidance requires enhanced disclosures regarding the nature, timing and uncertainty of revenue and cash flows arising from an entity's contracts with customers. This guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. Entities can choose to apply the guidance using either the full retrospective approach or a modified retrospective approach. Management is currently evaluating the impact that this guidance will have on the Company's consolidated financial statements, if any, including which transition method it will adopt.
	In April 2014, the FASB issued guidance for the reporting of discontinued operations, which also contains new disclosure requirements for both discontinued operations and other disposals that do not meet the definition of a discontinued operation. This guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. The effects of this guidance will depend on future disposals by the Company.

DESCRIPTION_OF_BUSINESS_AND_SU2

DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2014
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Schedule of earnings (loss) and weighted average shares outstanding used in the computation of basic and diluted earnings (loss) per share	The earnings and weighted average shares outstanding used in the computation of basic and diluted earnings per share are as follows:
		2014		2013		2012
	Numerator:
	Net earnings	$	9,095	$	15,908	$	2,373
	Less dividends declared:
	Class A		522		522		522
	Class B		2,665		2,576		2,697
	Undistributed earnings (loss)	$	5,908	$	12,810	$	(846	)
	Undistributed earnings (loss) allocation - basic and diluted:
	Class A undistributed earnings (loss)	$	1,058	$	2,346	$	(150	)
	Class B undistributed earnings (loss)		4,850		10,464		(696	)
	Total undistributed earnings (loss)	$	5,908	$	12,810	$	(846	)
	Net earnings allocation - basic and diluted:
	Class A net earnings	$	1,580	$	2,868	$	372
	Class B net earnings		7,515		13,040		2,001
	Net earnings	$	9,095	$	15,908	$	2,373
	Denominator:
	Weighted average shares outstanding:
	Class A - basic and diluted		2,175		2,175		2,175
	Class B - basic and diluted		9,491		9,240		9,625
	Net earnings per share:
	Class A - basic and diluted	$	0.73	$	1.32	$	0.17
	Class B - basic and diluted	$	0.79	$	1.41	$	0.21

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2014
Business Acquisition [Line Items]
Unaudited pro forma consolidated results of operations information	The unaudited pro forma results are presented for illustrative purposes only and are not necessarily indicative of the results that would have actually been obtained if the acquisitions had occurred on the assumed dates, nor is the pro forma data intended to be a projection of results that may be obtained in the future:
			Year Ended
			December 31,
			2014				2013
	Revenue		$	629,132			$	710,937
	Net earnings			11,705				(65,299	)
	Earnings per Class A common share - basic and diluted			0.94				(5.52	)
	Earnings per Class B common share - basic and diluted			1.02				(5.77	)
Power Solutions and Connectivity Solutions [Member]
Business Acquisition [Line Items]
Schedule of acquisition date fair values of assets acquired and liabilities assumed	The following table depicts the Company's current preliminary estimates of the respective acquisition date fair values of the consideration paid, identifiable net assets acquired and goodwill:
			Power Solutions					Connectivity Solutions					2014 Acquisitions
			June 19,					July 25/August 29,					Acquisition-Date
			2014					2014*					Fair Values
			(As adjusted)					(As adjusted)					(As adjusted)
	Cash		$	20,912				$	6,544				$	27,456
	Accounts receivable			29,389					9,375					38,764
	Inventories			36,429		(a)			17,632		(a)			54,061
	Other current assets			7,350					2,615					9,965
	Property, plant and equipment			28,175		(b)			9,900		(b)			38,075
	Intangible assets			33,220		(c)			40,000		(c)			73,220
	Other assets			19,171		(d)			2,345					21,516
	Total identifiable assets			174,646					88,411					263,057
	Accounts payable			(26,180	)				(10,682	)				(36,862	)
	Accrued expenses			(25,545	)	(e)			(5,307	)				(30,852	)
	Other current liabilities			223					(57	)				166
	Noncurrent liabilities			(42,062	)	(d)(e)(f)			(17,314	)				(59,376	)
	Total liabilities assumed			(93,564	)				(33,360	)				(126,924	)
	Net identifiable assets acquired			81,082					55,051					136,133
	Goodwill			49,710		(g)			50,306		(e)			100,016
	Net assets acquired		$	130,792				$	105,357				$	236,149
	Cash paid		$	130,792				$	105,357				$	236,149
	Assumption of liability			-					-					-
	Fair value of consideration
	transferred			130,792					105,357					236,149
	Deferred consideration			-					-					-
	Total consideration paid		$	130,792				$	105,357				$	236,149
	* The Company acquired the U.S. and U.K. entities of Connectivity Solutions on July 25, 2014 and the China entity of Connectivity Solutions on August 29, 2014.  These values represent the estimated fair values as of the respective acquisition dates.
	(a)	The inventories noted include the following estimated net step-up in fair value:
			Estimated Net Step-Up in Fair Value
	Power Solutions		$	3,273
	Connectivity Solutions			2,651
	2014 Acquisitions total		$	5,924
	(b)	The property, plant and equipment noted above for Connectivity Solutions includes a $4.3 million step-up based on estimated acquisition-date fair value.  There was no step-up for property, plant and equipment for Power Solutions since the estimated acquisition-date fair value approximated the carrying value of those assets.
	(c)	The preliminary fair value of identifiable intangible assets related to the 2014 Acquired Companies is shown in the table below.  For those intangible assets with finite lives, the acquisition-date fair values will be amortized over their respective estimated future lives utilizing the straight-line method.
			Acquisition-date Fair Values
			Power Solutions				Connectivity Solutions				2014 Acquisitions			Weighted-Average Life
	Trademarks		$	890			$	7,500			$	8,390		Indefinite
	Customer relationships			12,200				22,000				34,200		16 years
	Technology			7,800				9,000				16,800		14 years
	License agreements			11,800				-				11,800		8 years
	Non-compete agreements			530				1,500				2,030		3 years
	Total intangible assets acquired		$	33,220			$	40,000			$	73,220
	(d)	These amounts include a $12.0 million noncurrent liability and offsetting indemnification asset related to an ongoing claim by the Arezzo Revenue Agency in Italy concerning certain tax matters related to what was then Power-One Asia Pacific Electronics Shenzhen Co. Ltd. (now Bel Power Solutions Asia Pacific Electronics Shenzhen Co. Ltd.) for the years 2004 through 2006, as further described in Note 16.
	(e)	The Company acquired a liability for uncertain tax positions related to various tax matters for the years 2007 through 2013.  While resolution of these tax matters are being actively pursued with the applicable taxing authority, these issues remained unresolved as of the filing date of this Annual Report on Form 10-K.
	(f)	Deferred taxes have been established on the previously-mentioned step-ups for inventories, property, plant and equipment and intangible assets.
	(g)	The amount of goodwill is provisional as of the filing date, as the fair value determination of inventories acquired, and appraisals related to property, plant and equipment, various intangible assets and certain liabilities such as lease liabilities is still under review.  The portion of goodwill, if any, that will be deductible for tax purposes is yet to be determined.
Fair value of identifiable intangible assets			Acquisition-date Fair Values
			Power Solutions				Connectivity Solutions				2014 Acquisitions			Weighted-Average Life
	Trademarks		$	890			$	7,500			$	8,390		Indefinite
	Customer relationships			12,200				22,000				34,200		16 years
	Technology			7,800				9,000				16,800		14 years
	License agreements			11,800				-				11,800		8 years
	Non-compete agreements			530				1,500				2,030		3 years
	Total intangible assets acquired		$	33,220			$	40,000			$	73,220
TRP and Array [Member]
Business Acquisition [Line Items]
Schedule of acquisition date fair values of assets acquired and liabilities assumed	The following table depicts the finalized respective acquisition date fair values of the consideration paid and identifiable net assets acquired:
			TRP				Array				2013 Acquisitions
			March 29,				August 20,				Acquisition-Date
			2013				2013				Fair Values
			(As finalized)				(As finalized)				(As finalized)
	Cash		$	8,388			$	-			$	8,388
	Accounts receivable			11,541				994				12,535
	Inventories			7,355				993				8,348
	Other current assets			1,619				428				2,047
	Property, plant and equipment			5,790				3,510				9,300
	Intangible assets			6,110				1,470				7,580
	Other assets			1,349				1,747				3,096
	Total identifiable assets			42,152				9,142				51,294
	Accounts payable			(8,234	)			(676	)			(8,910	)
	Accrued expenses			(4,465	)			(285	)			(4,750	)
	Other current liabilities			(759	)			-				(759	)
	Noncurrent liabilities			(586	)			(1,748	)			(2,334	)
	Total liabilities assumed			(14,044	)			(2,709	)			(16,753	)
	Net identifiable assets acquired			28,108				6,433				34,541
	Goodwill			1,240				3,572				4,812
	Net assets acquired		$	29,348			$	10,005			$	39,353
	Fair value of consideration transferred		$	29,348			$	10,005			$	39,353

Restructuring_Activities_Table

Restructuring Activities (Tables)	12 Months Ended
	Dec. 31, 2014
Restructuring Activities [Abstract]
Activity and liability balances related to restructuring charges	Activity and liability balances related to restructuring costs for the years ended December 31, 2013 and 2014 are as follows:
				2013							2014
		Liability at				Cash Payments			Liability at				Cash Payments			Liability at
		December 31,		New		and Other			December 31,		New		and Other			December 31,
		2012		Charges		Settlements			2013		Charges		Settlements			2014
	Severance costs	$	122	$	1,239	$	(1,361	)	$	-	$	1,778	$	(1,778	)	$	-
	Transportation of equipment		-		100		(100	)		-		-		-			-
	Other restructuring costs		-		48		(48	)		-		54		(54	)		-
	Total	$	122	$	1,387	$	(1,509	)	$	-	$	1,832	$	(1,832	)	$	-

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Other Intangible Assets [Abstract]
Changes in carrying value of goodwill classified by reportable operating segment	The changes in the carrying value of goodwill classified by reportable operating segment for the years ended December 31, 2014 and 2013 are as follows:
		Total			North America			Asia			Europe
	Balance at January 1, 2013:
	Goodwill, gross		40,500			15,293			12,875			12,332
	Accumulated impairment charges		(26,941	)		(14,066	)		(12,875	)		-
	Goodwill, net	$	13,559		$	1,227		$	-		$	12,332
	Goodwill allocation related to acquisitions		4,812			3,572			1,240			-
	Foreign currency translation		119			-			(8	)		127
	Balance at December 31, 2013:
	Goodwill, gross		45,431			18,865			14,107			12,459
	Accumulated impairment charges		(26,941	)		(14,066	)		(12,875	)		-
	Goodwill, net	$	18,490		$	4,799		$	1,232		$	12,459
	Goodwill allocation related to acquisitions		100,016			50,118			35,486			14,412
	Measurement period adjustments		(496	)		(496	)		-			-
	Foreign currency translation		(437	)		-			(210	)		(227	)
	Balance at December 31, 2014:
	Goodwill, gross		144,514			68,487			49,383			26,644
	Accumulated impairment charges		(26,941	)		(14,066	)		(12,875	)		-
	Goodwill, net	$	117,573		$	54,421		$	36,508		$	26,644
Excess of estimated fair values over carrying value including goodwill	The excess of estimated fair values over carrying value, including goodwill for each of our reporting units that had goodwill as of the 2014 annual impairment test were the following:
	Reporting Unit	% by Which Estimated Fair Value Exceeds Carrying Value
	North America		10	%
	Asia		63	%
	Europe		19	%
Components of intangible assets other than goodwill	The components of intangible assets other than goodwill are as follows:
		31-Dec-14									31-Dec-13
		Gross Carrying			Accumulated			Net Carrying			Gross Carrying			Accumulated		Net Carrying
		Amount			Amortization			Amount			Amount			Amortization		Amount
	Patents, licenses and technology	$	38,872		$	4,297		$	34,575		$	11,919		$	1,864	$	10,055
	Customer relationships		45,836			3,062			42,774			11,923			1,191		10,732
	Non-compete agreements		2,781			1,050			1,731			787			483		304
	Trademarks		16,624			202			16,422			8,381			-		8,381
		$	104,113		$	8,611		$	95,502		$	33,010		$	3,538	$	29,472
Estimated amortization expense for intangible assets	Estimated amortization expense for intangible assets for the next five years is as follows:
	December 31,	Amortization Expense
	2015	$	7,481
	2016		7,181
	2017		6,848
	2018		6,556
	2019		6,515

Inventories_net_Tables

Inventories, net (Tables)	12 Months Ended
	Dec. 31, 2014
Inventories, net [Abstract]
Components of inventories	The components of inventories, net are as follows:
		December 31,
		2014		2013
	Raw materials	$	51,638	$	29,428
	Work in progress		16,128		8,783
	Finished goods		45,864		31,808
	Inventories, net	$	113,630	$	70,019

Property_Plant_and_Equipment_n1

Property, Plant and Equipment, net (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment, net [Abstract]
Property, plant and equipment	Property, plant and equipment, net consist of the following:
		December 31,
		2014			2013
	Land	$	3,293		$	3,229
	Buildings and improvements		31,067			25,216
	Machinery and equipment		117,973			82,420
	Construction in progress		4,764			4,042
			157,097			114,907
	Accumulated depreciation		(86,436	)		(74,011	)
	Property, plant and equipment, net	$	70,661		$	40,896

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Taxes [Abstract]
Reconciliation of beginning and ending amount of liability for uncertain tax positions	A reconciliation of the beginning and ending amount of the liability for uncertain tax positions is as follows:
		2014			2013			2012
	Liability for uncertain tax positions - January 1	$	2,189		$	2,711		$	4,132
	Additions based on tax positions
	related to the current year		2,732			28			1,221
	Additions relating to acquisitions		35,874			-			-
	Settlement/expiration of statutes of limitations		(825	)		(550	)		(2,642	)
	Liability for uncertain tax positions - December 31	$	39,970		$	2,189		$	2,711
Provision (benefit) for income taxes	The provision (benefit) for income taxes consists of the following:
		Years Ended December 31,
		2014			2013			2012
	Current:
	Federal	$	1,924		$	(1,099	)	$	(459	)
	Foreign		1,759			1,120			241
	State		175			113			76
			3,858			134			(142	)
	Deferred:
	Federal		(2,698	)		(865	)		(807	)
	State		(407	)		65			(58	)
	Foreign		543			(77	)		(369	)
			(2,562	)		(877	)		(1,234	)
		$	1,296		$	(743	)	$	(1,376	)
Reconciliation of taxes on income computed at the federal statutory rate	A reconciliation of taxes on income computed at the U.S. federal statutory rate to amounts provided is as follows:
		Years Ended December 31,
		2014						2013					2012
		$				%		$			%		$			%
	Tax provision computed at the
	federal statutory rate	$	3,638			35	%	$	5,309		35	%	$	339		34	%
	Increase (decrease) in taxes resulting from:
	Different tax rates
	applicable to foreign operations		(4,524	)		(44	%)		(4,677	)	(31	%)		(306	)	(31	%)
	Increase in (reversal of) liability for uncertain
	tax positions - net		1,907			18	%		(522	)	(3	%)		(1,421	)	(143	%)
	Utilization of research and experimentation, solar and foreign
	tax credits		(508	)		(5	%)		(1,049	)	(7	%)		-		0	%
	State taxes, net of federal benefit		(183	)		(2	%)		117		1	%		-		0	%
	Current year valuation allowance - U.S. segment		335			3	%		49		0	%		298		30	%
	Federal tax on profit of foreign disregarded entities
	net of deferred tax		770			7	%		-		0	%		-		0	%
	Permanent differences applicable to U.S. operations,
	including qualified production activity credits,
	SERP/COLI income, unrealized foreign exchange gains
	and amortization of purchase accounting intangibles		(11	)		0	%		(91	)	(1	%)		(260	)	(26	%)
	Other		(128	)		(1	%)		121		1	%		(26	)	(3	%)
	Tax (benefit) provision computed at the Company's
	effective tax rate	$	1,296			12	%	$	(743	)	(5	%)	$	(1,376	)	(138	%)
Components of deferred income tax assets	Components of deferred income tax assets are as follows:
		December 31,
		2014			2013
		Tax Effect			Tax Effect
	Deferred tax assets:
	State tax credits	$	954		$	1,336
	Unfunded pension liability		1,301			668
	Reserves and accruals		2,095			2,020
	Federal, state and foreign net operating loss
	and credit carryforwards		15,361			4,634
	Depreciation		962			973
	Amortization		995			588
	Acquired deferred taxes		10,775			-
	Other accruals		3,253			3,303
	Total deferred tax assets		35,696			13,522
	Deferred tax liabilities:
	Reserves and accruals		68			68
	Depreciation		707			1,076
	Amortization		21,191			4,762
	Acquired deferred taxes		8,053			-
	Other accruals		1,522			566
	Total deferred tax liabilities		31,541			6,472
	Valuation allowance		6,692			2,375
	Net deferred tax assets/(liabilities)	$	(2,537	)	$	4,675

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt [Abstract]
Scheduled principal payments of the long-term debt outstanding	Scheduled principal payments of the long-term debt outstanding at December 31, 2014 are as follows (in thousands):
	2015	$	13,438
	2016		16,125
	2017		18,812
	2018		24,188
	2019		160,062
	Total long-term debt		232,625
	Less: Current maturities of long-term debt		(13,438	)
	Noncurrent portion of long-term debt	$	219,187

Accrued_Expenses_Tables

Accrued Expenses (Tables)	12 Months Ended
	Dec. 31, 2014
Accrued Expenses [Abstract]
Accrued expenses	Accrued expenses consist of the following:
		Year Ended December 31,
		2014			2013
	Sales commissions	$	3,017		$	1,431
	Subcontracting labor		2,217			2,406
	Salaries, bonuses and related benefits		17,964			13,674
	Warranty accrual		6,032			-
	Litigation reserve		-			723
	Other		13,358			4,208
		$	42,588		$	22,442
Schedule of warranty accrual account for the period from the acquisition date	A tabular presentation of the activity within the warranty accrual account for the year ended December 31, 2014 is presented below:
		December 31,
		2014
	Beginning balance as of January 1, 2014	$	-
	Warranty accruals acquired in 2014 Acquisitions		4,397
	Charges and costs accrued		3,834
	Adjustments related to pre-existing warranties (including changes in estimates)		(66	)
	Less repair costs incurred		(2,061	)
	Currency translation		(72	)
	Ending balance as of December 31, 2014	$	6,032

Segments_Tables

Segments (Tables)	12 Months Ended
	Dec. 31, 2014
Segments [Abstract]
Key financial data	The following is a summary of key financial data:
		2014			2013			2012
	Net Sales to External Customers:
	North America	$	217,258		$	116,548		$	126,469
	Asia		201,338			193,647			128,319
	Europe		68,480			38,994			31,806
		$	487,076		$	349,189		$	286,594
	Net Sales:
	North America	$	248,007		$	128,472		$	138,966
	Asia		275,765			225,151			167,756
	Europe		114,748			40,742			33,329
	Less intercompany
	net sales		(151,444	)		(45,176	)		(53,457	)
		$	487,076		$	349,189		$	286,594
	Income (Loss) from Operations:
	North America	$	(4,465	)	$	(1,560	)	$	1,336
	Asia		13,338			15,356			(42	)
	Europe		5,220			1,251			369
		$	14,093		$	15,047		$	1,663
	Total Assets:
	North America	$	311,298		$	117,261		$	84,609
	Asia		254,822			148,780			148,351
	Europe		69,905			42,100			42,229
		$	636,025		$	308,141		$	275,189
	Capital Expenditures:
	North America	$	3,862		$	2,064		$	2,455
	Asia		4,089			4,551			2,003
	Europe		1,091			325			286
		$	9,042		$	6,940		$	4,744
	Depreciation and Amortization Expense:
	North America	$	7,921		$	4,282		$	4,081
	Asia		8,143			6,540			4,076
	Europe		3,682			1,560			956
		$	19,746		$	12,382		$	9,113
Schedule of segment sales and income from operations	The acquisitions in 2012-2014 contributed to Bel's segment sales and income from operations as follows:
		Year Ended
		December 31,
		2014			2013			2012
	Sales to External Customers:
	North America:
	Power Solutions	$	73,530		$	-		$	-
	Connectivity Solutions		28,242			-			-
	Array		6,842			2,074			-
			108,614			2,074			-
	Asia:
	Power Solutions		3,401			-			-
	Connectivity Solutions		2,469			-			-
	TRP		66,082			65,141			-
			71,952			65,141			-
	Europe:
	Power Solutions		23,882			-			-
	Connectivity Solutions		2,812			-			-
	TRP		2,498			1,407			-
	GigaCom		8			4			57
	Fibreco		6,197			7,483			2,062
	Powerbox		2,901			3,252			1,083
			38,298			12,146			3,202
	Net sales from 2012-2014 acquisitions		218,864			79,361			3,202
	Income (loss) from operations:
	North America:
	Power Solutions		(712	)		-			-
	Connectivity Solutions		(2,808	)		-			-
	Array		(801	)		(936	)		-
			(4,321	)		(936	)		-
	Asia:
	Power Solutions		(3,603	)		-			-
	Connectivity Solutions		493			-			-
	TRP		13,152			9,007			-
			10,042			9,007			-
	Europe:
	Power Solutions		4,882			-			-
	Connectivity Solutions		(167	)		-			-
	TRP		366			289			-
	GigaCom		(23	)		(986	)		(392	)
	Fibreco		817			2,101			297
	Powerbox		(1,869	)		(392	)		10
			4,006			1,012			(85	)
	Total income (loss) from operations
	from 2012-2014 acquisitions	$	9,727		$	9,083		$	(85	)
Schedule of restructuring charges included in income (loss) from operation	The following restructuring charges are included in income (loss) from operations by segment.  See Note 3, Restructuring Activities, for further information on the Company's restructuring efforts.
		2014			2013			2012
	North America	$	1,539		$	963		$	4,558
	Asia		-			249			612
	Europe		293			175			75
		$	1,832		$	1,387		$	5,245
Entity-wide information net sales to external customers by geographic area and by major product line	The following is a summary of entity-wide information related to the Company's net sales to external customers by geographic area and by major product line.
		2014			2013			2012
	Net Sales by Geographic Location:
	United States	$	217,258		$	116,548		$	126,469
	Macao		195,469			193,647			128,319
	United Kingdom		22,852			16,538			13,203
	Germany		18,663			16,585			14,165
	Switzerland		15,236			-			-
	All other foreign countries		17,598			5,871			4,438
	Consolidated net sales	$	487,076		$	349,189		$	286,594
	Net Sales by Major Product Line:
	Connectivity solutions	$	152,954		$	111,653		$	109,245
	Magnetic solutions		174,255			170,166			100,529
	Power solutions and protection		159,867			67,370			76,820
	Consolidated net sales	$	487,076		$	349,189		$	286,594
Long-lived assets by geographic area	The following is a summary of long-lived assets by geographic area as of December 31, 2014 and 2013:
		2014			2013
	Long-lived Assets by Geographic Location:
	United States	$	43,932		$	30,102
	People's Republic of China (PRC)		43,174			20,985
	Slovakia		9,675			-
	Switzerland		3,321			-
	United Kingdom		2,536			1,802
	All other foreign countries		1,723			1,455
	Consolidated long-lived assets	$	104,361		$	54,344

Retirement_Fund_and_Profit_Sha1

Retirement Fund and Profit Sharing Plan (Tables)	12 Months Ended
	Dec. 31, 2014
Retirement Fund and Profit Sharing Plan [Abstract]
Net periodic benefit cost related to the SERP	The net periodic benefit cost related to the SERP consisted of the following components during the years ended December 31, 2014, 2013 and 2012:
		2014			2013			2012
	Service Cost	$	542		$	556		$	438
	Interest Cost		541			448			417
	Net amortization		182			307			230
	Net periodic benefit cost	$	1,265		$	1,311		$	1,085
Information about changes in plan assets and benefit obligation, the funded status	Summarized information about the changes in plan assets and benefit obligation, the funded status and the amounts recorded at December 31, 2014 and 2013 are as follows:
		2014			2013
	Fair value of plan assets, January 1	$	-		$	-
	Company contributions		16			-
	Benefits paid		(16	)		-
	Fair value of plan assets, December 31	$	-		$	-
	Benefit obligation, January 1		10,830			11,045
	Service cost		542			556
	Interest cost		541			448
	Plan amendments		-			502
	Benefits paid		(16	)		-
	Actuarial (gains) losses		2,308			(1,721	)
	Benefit obligation, December 31	$	14,205		$	10,830
	Underfunded status, December 31	$	(14,205	)	$	(10,830	)
Expected benefit payments	The following benefit payments, which reflect expected future service, are expected to be paid:
	Years Ending
	December 31,
	2015		$	63
	2016			267
	2017			267
	2018			267
	2019			477
	2020 - 2024			3,876
Gross amounts recognized in accumulated other comprehensive loss, net of tax	The following gross amounts are recognized net of tax in accumulated other comprehensive loss:
		2014			2013
	Prior service cost	$	1,048		$	1,230
	Net loss		3,302			1,004
		$	4,350		$	2,234
Weighted average assumptions used in determining the periodic net cost and benefit obligation related to SERP	The weighted average assumptions used in determining the periodic net cost and benefit obligation information related to the SERP are as follows:
		2014			2013			2012
	Net periodic benefit cost
	Discount rate		5	%		4	%		4.5	%
	Rate of compensation increase		3	%		3	%		3	%
	Benefit obligation
	Discount rate		4	%		5	%		4	%
	Rate of compensation increase		3	%		3	%		3	%

Sharebased_Compensation_Tables

Share-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Summary of the restricted stock activity	A summary of the restricted stock activity under the Program as of December 31, 2014 is presented below:
	Restricted Stock				Weighted Average		Weighted Average
							Remaining
	Awards	Shares			Award Price		Contractual Term
	Outstanding at January 1, 2014		412,350		$	18.85	3.4 years
	Granted		378,000			23.57
	Vested		(120,175	)		18.69
	Forfeited		(26,900	)		22.03
	Outstanding at December 31, 2014		643,275		$	21.52	3.8 years

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies [Abstract]
Future minimum lease payments for operating leases	Future minimum lease payments for operating leases are approximately as follows:
	Year Ending
	December 31,
	2015	$	8,295
	2016		5,972
	2017		4,472
	2018		2,164
	2019		1,940
	Thereafter		4,025
		$	26,868

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive (Loss) Income (Tables)	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive (Loss) Income [Abstract]
Components of accumulated other comprehensive loss	The components of accumulated other comprehensive (loss) income as of December 31, 2014 and 2013 are summarized below:
			2014			2013				2012
	Foreign currency translation adjustment		$	(9,365	)	$	1,904			$	927
	Unrealized holding gain on available-for-sale
	securities, net of taxes of $259, $169 and $161 as of
	December 31, 2014, 2013 and 2012			429			282				256
	Unfunded SERP liability, net of taxes of ($1,325), ($693)
	and ($1,151) as of December 31, 2014, 2013 and 2012			(3,026	)		(1,541	)			(2,610	)
	Accumulated other comprehensive (loss) income		$	(11,962	)	$	645			$	(1,427	)
Changes in accumulated other comprehensive loss by component	Changes in accumulated other comprehensive (loss) income by component during the year ended December 31, 2014 are as follows.  All amounts are net of tax.
						Unrealized Holding
			Foreign Currency			Gains on
			Translation			Available-for-					Unfunded
			Adjustment			Sale Securities					SERP Liability				Total
	Balance at January 1, 2013		$	927		$	256				$	(2,610	)		$	(1,427	)
	Other comprehensive income before reclassifications			977			87					761				1,825
	Amounts reclassified from accumulated other
	comprehensive income (loss)			-			(61	)	(a)			308		(b)		247
	Net current period other comprehensive income			977			26					1,069				2,072
	Balance at December 31, 2013			1,904			282					(1,541	)			645
	Other comprehensive income (loss) before reclassifications			(11,269	)		147					(1,667	)			(12,789	)
	Amounts reclassified from accumulated other
	comprehensive income (loss)			-			-					182		(b)		182
	Net current period other comprehensive income (loss)			(11,269	)		147					(1,485	)			(12,607	)
	Balance at December 31, 2014		$	(9,365	)	$	429				$	(3,026	)		$	(11,962	)
	(a)	This reclassification relates to the gain on sale of SERP investments during the third quarter of 2013.  This is reflected as a gain on sale of investment in the consolidated statements of operations.
	(b)	This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP plan.  This expense is allocated between cost of sales and selling, general and administrative expense based upon the employment classification of the plan participants.

Selected_Quarterly_Financial_D1

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Data (Unaudited) [Abstract]
Quarterly results (unaudited)	Quarterly results for the year ended December 31, 2014 and 2013 are summarized as follows:
		2014
		First			Second		Third		Fourth
		Quarter			Quarter		Quarter		Quarter
	Net sales	$	82,646		$	99,439	$	156,341	$	148,650
	Cost of sales		68,576			81,493		128,250		120,781
	Net earnings		2,503			3,065		1,507		2,020
	Net earnings per share:
	Class A common share - basic and diluted	$	0.2		$	0.25	$	0.12	$	0.16
	Class B common share - basic and diluted	$	0.22		$	0.27	$	0.13	$	0.17
		2013
		First			Second		Third		Fourth
		Quarter			Quarter		Quarter		Quarter
	Net sales	$	63,028		$	93,981	$	101,164	$	91,016
	Cost of sales		53,932			78,724		81,136		73,160
	Net (loss) earnings		(558	)		1,689		7,380		7,397
	(Loss) earnings per share:
	Class A common share - basic and diluted	$	(0.05	)	$	0.14	$	0.62	$	0.61
	Class B common share - basic and diluted	$	(0.05	)	$	0.15	$	0.65	$	0.65

DESCRIPTION_OF_BUSINESS_AND_SU3

DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended								12 Months Ended			0 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 09, 2012	Sep. 12, 2012	Jul. 31, 2012	Aug. 20, 2013	Mar. 29, 2013	Jun. 19, 2014	Jul. 25, 2014
									Segment
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Number of reportable segments									3
Foreign Currency Translation [Abstract]
Change in Chinese Renminbi foreign currency exchange rate									0.80%
Net currency exchange (losses) gains									$4,300,000	($600,000)	$600,000
Foreign currency translation gains (losses)									-11,269,000	977,000	281,000
Numerator [Abstract]
Net earnings	2,020,000	1,507,000	3,065,000	2,503,000	7,397,000	7,380,000	1,689,000	-558,000	9,095,000	15,908,000	2,373,000
Undistributed earnings (loss)									5,908,000	12,810,000	-846,000
Undistributed earnings (loss) allocation - basic and diluted [Abstract]
Undistributed earnings (loss)									5,908,000	12,810,000	-846,000
Net earnings allocation - basic and diluted [Abstract]
Net earnings	2,020,000	1,507,000	3,065,000	2,503,000	7,397,000	7,380,000	1,689,000	-558,000	9,095,000	15,908,000	2,373,000
Net earnings per share: [Abstract]
Research and development costs									21,500,000	14,100,000	12,400,000
Class A [Member]
Numerator [Abstract]
Net earnings									1,580,000	2,868,000	372,000
Less dividends declared									522,000	522,000	522,000
Undistributed earnings (loss)									1,058,000	2,346,000	-150,000
Undistributed earnings (loss) allocation - basic and diluted [Abstract]
Undistributed earnings (loss)									1,058,000	2,346,000	-150,000
Net earnings allocation - basic and diluted [Abstract]
Net earnings									1,580,000	2,868,000	372,000
Weighted average shares outstanding [Abstract]
Weighted average shares outstanding (in shares)									2,175	2,175	2,175
Net earnings per share: [Abstract]
Common share - basic and diluted (in dollars per share)	$0.16	$0.12	$0.25	$0.20	$0.61	$0.62	$0.14	($0.05)	$0.73	$1.32	$0.17
Class B [Member]
Earnings Per Share [Line Items]
Dividend rate Class B common stock in excess of dividend rate of Class A common stock (in hundredths)									5.00%	5.00%	5.00%
Undistributed earning allocation rate of Class B common stock in excess of Class A common stock (in hundredths)									5.00%	5.00%	5.00%
Numerator [Abstract]
Net earnings									7,515,000	13,040,000	2,001,000
Less dividends declared									2,665,000	2,576,000	2,697,000
Undistributed earnings (loss)									4,850,000	10,464,000	-696,000
Undistributed earnings (loss) allocation - basic and diluted [Abstract]
Undistributed earnings (loss)									4,850,000	10,464,000	-696,000
Net earnings allocation - basic and diluted [Abstract]
Net earnings									$7,515,000	$13,040,000	$2,001,000
Weighted average shares outstanding [Abstract]
Weighted average shares outstanding (in shares)									9,491	9,240	9,625
Net earnings per share: [Abstract]
Common share - basic and diluted (in dollars per share)	$0.17	$0.13	$0.27	$0.22	$0.65	$0.65	$0.15	($0.05)	$0.79	$1.41	$0.21
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life									1 year
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life									15 years
Buildings and Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life									1 year
Buildings and Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life									39 years
GigaCom Interconnect [Member]
Business Acquisition [Line Items]
Acquisition date												9-Mar-12
Acquisition of issued and outstanding capital stock (in hundredths)												100.00%
Powerbox [Member]
Business Acquisition [Line Items]
Acquisition date													12-Sep-12
Acquisition of issued and outstanding capital stock (in hundredths)													100.00%
Fibreco [Member]
Business Acquisition [Line Items]
Acquisition date														31-Jul-12
Acquisition of issued and outstanding capital stock (in hundredths)														100.00%
Array [Member]
Business Acquisition [Line Items]
Acquisition date															20-Aug-13
Acquisition of issued and outstanding capital stock (in hundredths)															100.00%
TRP [Member]
Business Acquisition [Line Items]
Acquisition date																29-Mar-13
Acquisition of issued and outstanding capital stock (in hundredths)																100.00%
Power Solutions [Member]
Business Acquisition [Line Items]
Acquisition date																	19-Jun-14
Acquisition of issued and outstanding capital stock (in hundredths)																	100.00%
Emerson [Member]
Business Acquisition [Line Items]
Acquisition date																		25-Jul-14
Acquisition of issued and outstanding capital stock (in hundredths)																		100.00%

Acquisitions_Details

Acquisitions (Details)	12 Months Ended												0 Months Ended				12 Months Ended					0 Months Ended					12 Months Ended											0 Months Ended			0 Months Ended			0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jun. 19, 2014	Dec. 31, 2014	Jun. 19, 2014		Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Jul. 25, 2014		Dec. 31, 2014	Jul. 25, 2014		Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Mar. 09, 2012	Mar. 09, 2012	Mar. 09, 2012	Jul. 31, 2012	Jul. 31, 2012	Jul. 31, 2012	Sep. 12, 2012	Sep. 12, 2012	Sep. 12, 2012	Sep. 12, 2012	Mar. 29, 2013	Mar. 29, 2013	Mar. 29, 2013	Mar. 29, 2013	Aug. 20, 2013	Aug. 20, 2013	Aug. 20, 2013	Aug. 20, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
	USD ($)	USD ($)	USD ($)	Trademarks [Member]	Technology [Member]	Customer Relationships [Member]	Licensing Agreements [Member]	Noncompete Agreements [Member]	Class A [Member]	Class A [Member]	Class B [Member]	Class B [Member]	Power Solutions [Member]	Power Solutions [Member]	Power Solutions [Member]		Power Solutions [Member]	Power Solutions [Member]	Power Solutions [Member]	Power Solutions [Member]	Power Solutions [Member]	Connectivity Solutions [Member]		Connectivity Solutions [Member]	Connectivity Solutions [Member]		Connectivity Solutions [Member]	Connectivity Solutions [Member]	Connectivity Solutions [Member]	Connectivity Solutions [Member]	Connectivity Solutions [Member]	2014 Acquired Companies [Member]	2014 Acquired Companies [Member]	2014 Acquired Companies [Member]	2014 Acquired Companies [Member]	2014 Acquired Companies [Member]	2014 Acquired Companies [Member]	GigaCom Interconnect [Member]	GigaCom Interconnect [Member]	GigaCom Interconnect [Member]	Fibreco [Member]	Fibreco [Member]	Fibreco [Member]	Powerbox Italy [Member]	Powerbox Italy [Member]	Powerbox Italy [Member]	Powerbox Italy [Member]	TRP [Member]	TRP [Member]	TRP [Member]	TRP [Member]	Array [Member]	Array [Member]	Array [Member]	Array [Member]	2013 Acquired Companies [Member]	2013 Acquired Companies [Member]	2013 Acquired Companies [Member]	2013 Acquired Companies [Member]
				USD ($)					USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)		Trademarks [Member]	Technology [Member]	Customer Relationships [Member]	Licensing Agreements [Member]	Noncompete Agreements [Member]	USD ($)		USD ($)	USD ($)		Trademarks [Member]	Technology [Member]	Customer Relationships [Member]	Licensing Agreements [Member]	Noncompete Agreements [Member]	USD ($)	Technology [Member]	Customer Relationships [Member]	Licensing Agreements [Member]	Noncompete Agreements [Member]	Acquisition Date Fair Values (As adjusted) [Member]	USD ($)	EUR (€)		USD ($)	EUR (€)		USD ($)		Class B [Member]	Class B [Member]	USD ($)		Acquisition Date Fair Values [Member]	Acquisition Date Fair Values [Member]	USD ($)		Measurement Period Adjustments [Member]	Measurement Period Adjustments [Member]	USD ($)	USD ($)	USD ($)	Acquisition Date Fair Values (As adjusted) [Member]
																	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)						USD ($)	USD ($)	USD ($)	USD ($)	USD ($)		USD ($)	USD ($)	USD ($)	USD ($)	USD ($)										USD ($)			USD ($)	USD ($)			USD ($)	USD ($)				USD ($)
Business Acquisition [Line Items]
Payment for acquisitions, net of cash acquired	$208,693,000	$30,994,000	$19,410,000										$109,900,000									$98,800,000																$2,700,000	€ 1,700,000		$13,700,000	€ 8,700,000		$3,000,000				$21,000,000				$10,000,000
Acquisition-related costs																																7,300,000																								100,000	900,000	1,300,000
Assets acquired [Abstract]
Cash															20,912,000										6,544,000	[1]											27,456,000														8,388,000				0				8,388,000
Accounts receivable															29,389,000										9,375,000	[1]											38,764,000														11,541,000				994,000				12,535,000
Inventories															36,429,000	[2]									17,632,000	[1],[2]											54,061,000														7,355,000				993,000				8,348,000
Other current assets															7,350,000										2,615,000	[1]											9,965,000														1,619,000				428,000				2,047,000
Property, plant and equipment															28,175,000	[3]									9,900,000	[1],[3]											38,075,000														5,790,000				3,510,000				9,300,000
Intangible assets														33,220,000	33,220,000	[4]								40,000,000	40,000,000	[1],[4]						73,220,000					73,220,000														6,110,000				1,470,000				7,580,000
Other assets															19,171,000	[5]									2,345,000	[1]											21,516,000														1,349,000				1,747,000				3,096,000
Total identifiable assets															174,646,000										88,411,000	[1]											263,057,000														42,152,000				9,142,000				51,294,000
Liabilities assumed [Abstract]
Accounts payable															-26,180,000										-10,682,000	[1]											-36,862,000														-8,234,000				-676,000				-8,910,000
Accrued expenses															-25,545,000	[6]									-5,307,000	[1]											-30,852,000														-4,465,000				-285,000				-4,750,000
Other current liabilities															223,000										-57,000	[1]											166,000														-759,000				0				-759,000
Noncurrent liabilities															-42,062,000	[5],[6],[7]									-17,314,000	[1]											-59,376,000														-586,000				-1,748,000				-2,334,000
Total liabilities assumed															-93,564,000										-33,360,000	[1]											-126,924,000														-14,044,000				-2,709,000				-16,753,000
Net identifiable assets acquired															81,082,000										55,051,000	[1]											136,133,000														28,108,000				6,433,000				34,541,000
Goodwill	117,573,000	18,490,000	13,559,000												49,710,000	[8]									50,306,000	[1],[6]											100,016,000														1,240,000				3,572,000				4,812,000
Net assets acquired															130,792,000										105,357,000	[1]											236,149,000														29,348,000				10,005,000				39,353,000
Consideration transferred [Abstract]
Cash Paid													130,792,000									105,357,000	[1]														236,149,000
Assumption of liability													0									0	[1]														0
Fair value of consideration transferred													130,792,000									105,357,000	[1]														236,149,000													29,348,000				10,005,000					39,353,000
Deferred consideration													0									0	[1]														0
Total consideration paid/payable													130,792,000									105,357,000	[1]														236,149,000
Estimated net set-up in fair value related to inventories														3,273,000										2,651,000								5,924,000
Estimated net set-up in fair value related to property, plant and equipment																								4,300,000
Fair Value of Identifiable Intangible Assets [Abstract]
Acquisition date fair value				8,390,000													890,000	7,800,000	12,200,000	11,800,000	530,000						7,500,000	9,000,000	22,000,000	0	1,500,000		16,800,000	34,200,000	11,800,000	2,030,000
Weighted average life					14 years	16 years	8 years	3 years
Total identifiable assets acquired														33,220,000	33,220,000	[4]								40,000,000	40,000,000	[1],[4]						73,220,000					73,220,000														6,110,000				1,470,000				7,580,000
Noncurrent liability and offsetting indemnification asset	12,000,000
Unaudited Pro forma Consolidated Results of Operations
Revenue	629,132,000	710,937,000																														134,300,000																								75,400,000	68,600,000
Net earnings	11,705,000	-65,299,000
Income (loss) from operations	14,093,000	15,047,000	1,663,000																													-1,900,000																								12,700,000	8,400,000
Earnings per common share - basic and diluted (in dollars per share)									$0.94	($5.52)	$1.02	($5.77)
Acquisition-related costs excluded from pro forma net earnings	14,900,000	5,900,000
Acquisition-related costs incurred but excluded from pro forma earnings during the period after tax	9,800,000	4,100,000
Acquisition of issued and outstanding capital stock (in hundredths)															100.00%																									100.00%			100.00%		100.00%				100.00%				100.00%
Cash acquired from acquisition	27,456,000	8,359,000	2,991,000																																						2,700,000			200,000
Number of restricted shares granted for acquisition (in shares)																																														30,000
Compensation expense of grant date fair value of restricted shares																																															$600,000
[1]	The Company acquired the U.S. and U.K. entities of Connectivity Solutions on July 25, 2014 and the China entity of Connectivity Solutions on August 29, 2014. These values represent the estimated fair values as of the respective acquisition dates.
[2]	The inventories noted include the following estimated net step-up in fair value: Estimated Net Step-Up in Fair Value Power Solutions $ 3,273 Connectivity Solutions 2,675 2014 Acquisitions total $ 5,948
[3]	The property, plant and equipment noted above for Connectivity Solutions includes a $4.3 million step-up based on estimated acquisition-date fair value. There was no step-up for property, plant and equipment for Power Solutions since the estimated acquisition-date fair value approximated the carrying value of those assets.
[4]	The preliminary fair value of identifiable intangible assets related to the 2014 Acquired Companies is shown in the table below. For those intangible assets with finite lives, the acquisition-date fair values will be amortized over their respective estimated future lives utilizing the straight-line method. Acquisition-date Fair Values Power Solutions Connectivity Solutions 2014 Acquisitions Weighted-Average Life Trademarks $ 890 $ 7,500 $ 8,390 Indefinite Customer relationships 12,200 22,000 34,200 16 years Technology 7,800 9,000 16,800 14 years License agreements 11,800 - 11,800 8 years Non-compete agreements 530 1,500 2,030 3 years Total intangible assets acquired $ 33,220 $ 40,000 $ 73,220
[5]	These amounts include a $12.0 million noncurrent liability and offsetting indemnification asset related to an ongoing claim by the Arezzo Revenue Agency in Italy concerning certain tax matters related to what was then Power-One Asia Pacific Electronics Shenzhen Co. Ltd. (now Bel Power Solutions Asia Pacific Electronics Shenzhen Co. Ltd.) for the years 2004 through 2006, as further described in Note 16.
[6]	The Company acquired a liability for uncertain tax positions related to various tax matters for the years 2007 through 2013. While resolution of these tax matters are being actively pursued with the applicable taxing authority, these issues remained unresolved as of the filing date of this Annual Report on Form 10-K.
[7]	Deferred taxes have been established on the previously-mentioned step-ups for inventories, property, plant and equipment and intangible assets.
[8]	The amount of goodwill is provisional as of the filing date, as the fair value determination of inventories acquired, and appraisals related to property, plant and equipment, various intangible assets and certain liabilities such as lease liabilities is still under review. The portion of goodwill, if any, that will be deductible for tax purposes is yet to be determined.

Restructuring_Activities_Detai

Restructuring Activities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Activity and liability balances related to restructuring charges [Roll Forward]
Liability, Beginning balance	$0	$122,000
New Charges	1,832,000	1,387,000	5,245,000
Cash Payment and Other Settlements	-1,832,000	-1,509,000
Liability, Ending balance	0	0	122,000
Restructuring costs	1,832,000	1,387,000	5,245,000
Severance costs			3,200,000
Asset disposals			1,400,000
Other expenses			600,000
Severance Costs [Member]
Activity and liability balances related to restructuring charges [Roll Forward]
Liability, Beginning balance	0	122,000
New Charges	1,778,000	1,239,000
Cash Payment and Other Settlements	-1,778,000	-1,361,000
Liability, Ending balance	0	0
Restructuring costs	1,778,000	1,239,000
Transportation of Equipment [Member]
Activity and liability balances related to restructuring charges [Roll Forward]
Liability, Beginning balance	0	0
New Charges	0	100,000
Cash Payment and Other Settlements	0	-100,000
Liability, Ending balance	0	0
Restructuring costs	0	100,000
Other Restructuring Costs [Member]
Activity and liability balances related to restructuring charges [Roll Forward]
Liability, Beginning balance	0	0
New Charges	54,000	48,000
Cash Payment and Other Settlements	-54,000	-48,000
Liability, Ending balance	0	0
Restructuring costs	$54,000	$48,000

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]
Goodwill, gross beginning of period	$45,431,000	$40,500,000
Accumulated impairment charges beginning of period	-26,941,000	-26,941,000
Goodwill, net beginning of period	18,490,000	13,559,000
Goodwill allocation related to acquisitions	100,016,000	4,812,000	9,065,000
Measurement period adjustments	-496,000
Foreign currency translation	-437,000	119,000
Goodwill, gross end of period	144,514,000	45,431,000	40,500,000
Accumulated impairment charges end of period	-26,941,000	-26,941,000	-26,941,000
Goodwill, net end of period	117,573,000	18,490,000	13,559,000
Components of intangible assets other than goodwill [Abstract]
Gross Carrying Amount	104,113,000	33,010,000
Accumulated Amortization	8,611,000	3,538,000
Net Carrying Amount	95,502,000	29,472,000
Intangible assets acquired	73,200,000	8,900,000
Amortization expense	5,400,000	1,900,000	800,000
Estimated amortization expense for intangible assets [Abstract]
2015	7,481,000
2016	7,181,000
2017	6,848,000
2018	6,556,000
2019	6,515,000
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets amortization period	2 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets amortization period	24 years
Patents, Licenses and Technology [Member]
Components of intangible assets other than goodwill [Abstract]
Gross Carrying Amount	38,872,000	11,919,000
Accumulated Amortization	4,297,000	1,864,000
Net Carrying Amount	34,575,000	10,055,000
Customer Relationships [Member]
Components of intangible assets other than goodwill [Abstract]
Gross Carrying Amount	45,836,000	11,923,000
Accumulated Amortization	3,062,000	1,191,000
Net Carrying Amount	42,774,000	10,732,000
Non-compete Agreements [Member]
Components of intangible assets other than goodwill [Abstract]
Gross Carrying Amount	2,781,000	787,000
Accumulated Amortization	1,050,000	483,000
Net Carrying Amount	1,731,000	304,000
Trademarks [Member]
Components of intangible assets other than goodwill [Abstract]
Gross Carrying Amount	16,624,000	8,381,000
Accumulated Amortization	202,000	0
Net Carrying Amount	16,422,000	8,381,000
North America [Member]
Goodwill [Roll Forward]
Goodwill, gross beginning of period	18,865,000	15,293,000
Accumulated impairment charges beginning of period	-14,066,000	-14,066,000
Goodwill, net beginning of period	4,799,000	1,227,000
Goodwill allocation related to acquisitions	50,118,000	3,572,000
Measurement period adjustments	-496,000
Foreign currency translation	0	0
Goodwill, gross end of period	68,487,000	18,865,000
Accumulated impairment charges end of period	-14,066,000	-14,066,000
Goodwill, net end of period	54,421,000	4,799,000
Reporting unit, Percentage of fair value in excess of carrying amount (in hundredths)	10.00%
Asia [Member]
Goodwill [Roll Forward]
Goodwill, gross beginning of period	14,107,000	12,875,000
Accumulated impairment charges beginning of period	-12,875,000	-12,875,000
Goodwill, net beginning of period	1,232,000	0
Goodwill allocation related to acquisitions	35,486,000	1,240,000
Measurement period adjustments	0
Foreign currency translation	-210,000	-8,000
Goodwill, gross end of period	49,383,000	14,107,000
Accumulated impairment charges end of period	-12,875,000	-12,875,000
Goodwill, net end of period	36,508,000	1,232,000
Reporting unit, Percentage of fair value in excess of carrying amount (in hundredths)	63.00%
Europe [Member]
Goodwill [Roll Forward]
Goodwill, gross beginning of period	12,459,000	12,332,000
Accumulated impairment charges beginning of period	0	0
Goodwill, net beginning of period	12,459,000	12,332,000
Goodwill allocation related to acquisitions	14,412,000	0
Measurement period adjustments	0
Foreign currency translation	-227,000	127,000
Goodwill, gross end of period	26,644,000	12,459,000
Accumulated impairment charges end of period	0	0
Goodwill, net end of period	$26,644,000	$12,459,000
Reporting unit, Percentage of fair value in excess of carrying amount (in hundredths)	19.00%

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross unrealized gains associated with the investment held in the rabbi trust	$147,000	$87,000	($251,000)
Fair value of investments	100,000	100,000
Gross unrealized gains	100,000	100,000
Transfers in out between levels	0	0
Carrying amount of long-term debt	232,625,000
Investments held in Rabbi Trust [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investments	5,800,000
Available-for-sale securities measured at fair value	6,500,000	3,300,000
Investments held in Rabbi Trust [Member] | SERP [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross unrealized gains associated with the investment held in the rabbi trust	700,000	400,000
Fair value of long-term debt	233,300,000
Carrying amount of long-term debt	232,625,000
Available-for-sale securities measured at fair value	$6,500,000	$3,300,000

Other_Assets_Details

Other Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Cash surrender value of the COLI	$5,800,000	$8,600,000
Entity surrender value	5,756,000	0	0
Increase (decrease) in cash surrender value	200,000	700,000	300,000
Payments to acquire marketable securities	2,936,000	0	24,000
Fair value of investments	100,000	100,000
Investments held in Rabbi Trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Entity surrender value	2,900,000
Fair value of investments	5,800,000
Fair value of investments	6,500,000	3,300,000
Unrealized gain on investments	700,000	400,000
Supplemental Employee Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	14,205,000	10,830,000	11,045,000
Value of assets earmarked for SERP use but not restricted to that use	12,300,000	11,900,000
Payments to acquire marketable securities	$2,900,000

Inventories_net_Details

Inventories, net (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Components of inventories [Abstract]
Raw materials	$51,638	$29,428
Work in progress	16,128	8,783
Finished goods	45,864	31,808
Inventories, net	$113,630	$70,019

Property_Plant_and_Equipment_n2

Property, Plant and Equipment, net (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	$157,097,000	$114,907,000
Accumulated depreciation	-86,436,000	-74,011,000
Property, plant and equipment, net	70,661,000	40,896,000
Depreciation expense	14,300,000	10,500,000	8,400,000
Land [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	3,293,000	3,229,000
Buildings and Improvements [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	31,067,000	25,216,000
Machinery and Equipment [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	117,973,000	82,420,000
Construction in Progress [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	$4,764,000	$4,042,000

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Liability for uncertain tax position that would impact effective tax rate	$2,800,000		$2,800,000	$2,200,000
Liabilities for uncertain tax positions included in income tax payable	200,000		200,000	1,000,000
Liability for uncertain tax positions noncurrent	39,767,000		39,767,000	1,218,000
Years tax audit notified by foreign tax authority				2006 and 2009
Prior year liability uncertain tax positions relating to 2011	200,000		200,000
Decreases resulting from prior period tax positions			-800,000	-500,000
Interest and penalties uncertain tax positions recognized reversal			200,000
Reconciliation of beginning and ending amount of liability for uncertain tax positions [Roll Forward]
Liability for uncertain tax positions - January 1		2,711,000	2,189,000	2,711,000	4,132,000
Additions based on tax positions related to the current year			2,732,000	28,000	1,221,000
Additions relating to acquisitions			35,874,000	0	0
Settlement/expiration of statutes of limitations			-825,000	-550,000	-2,642,000
Liability for uncertain tax positions - December 31	39,970,000		39,970,000	2,189,000	2,711,000
Accrued interest and penalties uncertain tax positions	1,600,000		1,600,000	200,000
Earnings (loss) before provision (benefit) for income taxes included earnings from domestic operations			-9,200,000	-1,200,000	400,000
Earnings (loss) from foreign operations			19,600,000	16,300,000	600,000
Current [Abstract]
Federal			1,924,000	-1,099,000	-459,000
Foreign			1,759,000	1,120,000	241,000
State			175,000	113,000	76,000
Total			3,858,000	134,000	-142,000
Deferred [Abstract]
Federal			-2,698,000	-865,000	-807,000
State			-407,000	65,000	-58,000
Foreign			543,000	-77,000	-369,000
Total			-2,562,000	-877,000	-1,234,000
Tax (benefit) provision computed at the Company's effective tax rate			1,296,000	-743,000	-1,376,000
Reconciliation of taxes on income computed at the federal statutory rate [Abstract]
Tax provision computed at the federal statutory rate			3,638,000	5,309,000	339,000
Increase (decrease) in taxes resulting from [Abstract]
Different tax rates applicable to foreign operations			-4,524,000	-4,677,000	-306,000
Increase in (reversal of) liability for uncertain tax positions - net			1,907,000	-522,000	-1,421,000
Utilization of research and experimentation, solar and foreign			-508,000	-1,049,000	0
State taxes, net of federal benefit			-183,000	117,000	0
Current year valuation allowance - U.S. segment			335,000	49,000	298,000
Federal tax on profit of foreign disregarded entities net of deferred tax			770,000	0	0
Permanent differences applicable to U.S. operations, including qualified production activity credits, SERP/COLI income, unrealized foreign exchange gains and amortization of purchase accounting intangibles			-11,000	-91,000	-260,000
Other			-128,000	121,000	-26,000
Tax (benefit) provision computed at the Company's effective tax rate			1,296,000	-743,000	-1,376,000
Increase (decrease) in effective tax rate resulting from [Abstract]
Tax provision computed at the federal statutory rate (in hundredths)			35.00%	35.00%	34.00%
Different tax rates and permanent differences applicable to foreign operations (in hundredths)			-44.00%	-31.00%	-31.00%
Increase in (reversal of) liability for uncertain tax positions - net (in hundredths)			18.00%	-3.00%	-143.00%
Utilization of research and development, solar and foreign tax credits (in hundredths)			-5.00%	-7.00%	0.00%
State taxes, net of federal benefit (in hundredths)			-2.00%	1.00%	0.00%
Current year valuation allowance - U.S. segment (in hundredths)			3.00%	0.00%	30.00%
Federal tax on profit of foreign disregarded entities net of deferred tax (in hundredths)			7.00%	0.00%	0.00%
Permanent differences applicable to U.S. operations, including qualified production activity credits, SERP/COLI income, unrealized foreign exchange gains and amortization of purchase accounting intangibles (in hundredths)			0.00%	-1.00%	-26.00%
Other (in hundredths)			-1.00%	1.00%	-3.00%
Tax (benefit) provision computed at the Company's effective tax rate (in hundredths)			12.00%	-5.00%	-138.00%
Macao corporate profit tax rate (in hundredths)			12.00%
PRC income tax rate (in hundredths)			25.00%
Deferred tax liability	31,541,000		31,541,000	6,472,000
Unrepatriated foreign earnings	126,600,000		126,600,000
Estimated federal income tax liability related to unrepatriated foreign earnings	32,400,000		32,400,000
Deferred tax assets [Abstract]
State tax credits	954,000		954,000	1,336,000
Unfunded pension liability	1,301,000		1,301,000	668,000
Reserves and accruals	2,095,000		2,095,000	2,020,000
Federal, state and foreign net operating loss and credit carryforwards	15,361,000		15,361,000	4,634,000
Depreciation	962,000		962,000	973,000
Amortization	995,000		995,000	588,000
Acquired deferred taxes	10,775,000		10,775,000	0
Other accruals	3,253,000		3,253,000	3,303,000
Total deferred tax assets	35,696,000		35,696,000	13,522,000
Deferred tax liabilities [Abstract]
Reserves and accruals	68,000		68,000	68,000
Depreciation	707,000		707,000	1,076,000
Amortization	21,191,000		21,191,000	4,762,000
Acquired deferred taxes	8,053,000		8,053,000	0
Other accruals	1,522,000		1,522,000	566,000
Total deferred tax liabilities	31,541,000		31,541,000	6,472,000
Valuation allowances	6,692,000		6,692,000	2,375,000
Net deferred tax assets/(liabilities)	-2,537,000		-2,537,000	4,675,000
Expected increase in income tax benefit	300,000
Increase in income tax benefit		400,000
Fibreco, GigaCom and Powerbox [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Deferred tax liability	2,100,000		2,100,000
Deferred tax liabilities [Abstract]
Total deferred tax liabilities	2,100,000		2,100,000
Fibreco [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Deferred tax liability	100,000		100,000
Deferred tax liabilities at the date of acquisition	1,700,000		1,700,000
Deferred tax liabilities [Abstract]
Total deferred tax liabilities	100,000		100,000
GigaCom [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Deferred tax liabilities at the date of acquisition	600,000		600,000
TRP and Array [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Deferred tax liability	300,000		300,000
Deferred tax liabilities [Abstract]
Total deferred tax liabilities	300,000		300,000
TRP [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Deferred tax asset	2,200,000		2,200,000
Deferred tax liabilities at the date of acquisition	600,000		600,000
Array [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Operating loss carryforwards	5,900,000		5,900,000
Deferred tax asset	2,100,000		2,100,000
Deferred tax liability	700,000		700,000
Deferred tax liabilities at the date of acquisition	1,000,000		1,000,000
Deferred tax liabilities [Abstract]
Total deferred tax liabilities	700,000		700,000
Power Solutions [Member]
Income Taxes [Line Items]
Years tax audit notified by foreign tax authority			2007 through 2013
Decreases resulting from prior period tax positions			1,200,000
Interest and penalties uncertain tax positions recognized			1,200,000
Reconciliation of beginning and ending amount of liability for uncertain tax positions [Roll Forward]
Interest and penalties uncertain tax positions recognized until various tax matters are resolved			2,500,000
Accrued interest and penalties uncertain tax positions	1,600,000		1,600,000
Increase (decrease) in effective tax rate resulting from [Abstract]
Deferred tax asset	7,100,000		7,100,000
Deferred tax liability	3,100,000		3,100,000
Deferred tax liabilities [Abstract]
Total deferred tax liabilities	3,100,000		3,100,000
Connectivity Solutions [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Operating loss carryforwards	16,700,000		16,700,000
Deferred tax asset	1,200,000		1,200,000
Deferred tax liability	16,400,000		16,400,000
Deferred tax assets [Abstract]
Federal, state and foreign net operating loss and credit carryforwards	9,000,000		9,000,000
Deferred tax liabilities [Abstract]
Total deferred tax liabilities	16,400,000		16,400,000
Powerbox [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Deferred tax liabilities at the date of acquisition	400,000		400,000
Power Solutions and Emerson Network Power Connectivity Solutions [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Deferred tax liability	8,300,000		8,300,000
Deferred tax liabilities [Abstract]
Total deferred tax liabilities	8,300,000		8,300,000
Asia [Member] | Power Solutions [Member]
Income Taxes [Line Items]
Years tax audit notified by foreign tax authority			2004 through 2006
Interest and penalties uncertain tax positions recognized			-500,000
Reconciliation of beginning and ending amount of liability for uncertain tax positions [Roll Forward]
Accrued interest and penalties uncertain tax positions	1,600,000		1,600,000
U.S. Federal [Member]
Income Taxes [Line Items]
Years not subject to examination by tax authorities			before 2011
Federal and State Jurisdiction [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Operating loss carryforwards	27,700,000		27,700,000
State Jurisdiction [Member]
Income Taxes [Line Items]
Years not subject to examination by tax authorities			before 2008
Increase (decrease) in effective tax rate resulting from [Abstract]
Tax credit carryforward	2,100,000		2,100,000
Capital loss carryforwards	900,000		900,000
Capital loss carryforward, valuation allowance	300,000		300,000
Operating loss carryforwards, valuation allowance	200,000		200,000
Capital loss caryforwards, deferred tax assets	300,000		300,000
Tax credit carryforward, valuation allowance	1,200,000		1,200,000
Foreign Jurisdictions [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Operating loss carryforwards	19,400,000		19,400,000
Tax credit carryforward	300,000		300,000
Operating loss carryforwards, valuation allowance	4,900,000		4,900,000
Deferred tax asset	4,900,000		4,900,000
Foreign Jurisdictions [Member] | Capital Loss Carryforward [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Capital loss carryforwards	200,000		200,000
Foreign Jurisdictions [Member] | Asia [Member]
Income Taxes [Line Items]
Years not subject to examination by tax authorities			before 2003
Foreign Jurisdictions [Member] | Asia [Member] | Power Solutions [Member]
Reconciliation of beginning and ending amount of liability for uncertain tax positions [Roll Forward]
Additions relating to acquisitions			$12,000,000
Foreign Jurisdictions [Member] | Europe [Member]
Income Taxes [Line Items]
Years not subject to examination by tax authorities			before 2007

Debt_Details

Debt (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2014
Line of Credit Facility [Line Items]
Additional borrowings			$90,000,000
Scheduled principal payments [Abstract]
2015	13,438,000
2016	16,125,000
2017	18,812,000
2018	24,188,000
2019	160,062,000
Total long-term debt	232,625,000
Less: Current maturities of long-term debt	-13,438,000	0
Noncurrent portion of long-term debt	219,187,000	0
New Secured Credit Agreement [Member]
Line of Credit Facility [Line Items]
Additional borrowings	100,000,000
Percentage of capital stock of foreign subsidiaries given as collateralized security to line of credit (in hundredths)	65.00%
Basis spread on variable rate (in hundredths)	2.75%
Interest on borrowings outstanding (in hundredths)	2.94%
Effective LIBOR rate (in hundredths)	0.19%
Line of credit, current borrowing capacity	27,000,000
Available to borrow without violating our Leverage Ratio covenant	16,200,000
Deferred financing costs	5,800,000
Deferred financing costs amortization period	5 years
Interest expense incurred	4,000,000
New Secured Credit Agreement [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)	1.00%
New Secured Credit Agreement [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)	0.50%
Line of Credit [Member]
Line of Credit Facility [Line Items]
Available line of credit		30,000,000
Interest on borrowings outstanding (in hundredths)		1.40%
Line of credit, current borrowing capacity		18,000,000
Line of credit, amount outstanding		12,000,000
Line of credit facility, expiration date		14-Oct-16
Interest expense incurred	100,000	200,000
Repayments of line of credit	12,000,000
Revolving Credit Facility [Member] | New Secured Credit Agreement [Member]
Line of Credit Facility [Line Items]
Available line of credit	50,000,000
Additional borrowings			20,000,000
Line of credit, amount outstanding	23,000,000
Term Loan [Member] | New Secured Credit Agreement [Member]
Line of Credit Facility [Line Items]
Available line of credit	145,000,000
Line of credit, amount outstanding	145,000,000
Delayed Draw Term Loan [Member] | New Secured Credit Agreement [Member]
Line of Credit Facility [Line Items]
Available line of credit	70,000,000
Additional borrowings			70,000,000
Line of credit, amount outstanding	$70,000,000
Minimum [Member] | New Secured Credit Agreement [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)	1.75%
Minimum [Member] | New Secured Credit Agreement [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)	0.75%
Minimum [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)		1.00%
Maximum [Member] | New Secured Credit Agreement [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)	3.00%
Maximum [Member] | New Secured Credit Agreement [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)	2.00%
Maximum [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)		1.50%

Accrued_Expenses_Details

Accrued Expenses (Details) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accrued expenses [Abstract]
Sales commissions	$3,017	$1,431
Subcontracting labor	2,217	2,406
Salaries, bonuses and related benefits	17,964	13,674
Warranty accrual	6,032	0
Litigation reserve	0	723
Other	13,358	4,208
Accrued expenses	42,588	22,442
Power Solutions [Member]
Schedule of warranty accrual account for the period from the acquisition date [Roll Forward]
Beginning balance as of June 19, 2014	0
Warranty accruals acquired in 2014 Acquisitions	4,397
Charges and costs accrued	3,834
Adjustments related to pre-existing warranties (including changes in estimates)	-66
Less repair costs incurred	-2,061
Currency translation	-72
Ending balance as of December 31, 2014	$6,032

Segments_Details

Segments (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
									Industry
									Segment
Segments [Abstract]
Number of industry in which entity operates									1
Number of reportable operating segments									3
Summary of key financial data [Abstract]
Net Sales to External Customers									$76,400	$103,300	$70,600
Net Sales	148,650	156,341	99,439	82,646	91,016	101,164	93,981	63,028	487,076	349,189	286,594
Income (loss) from operations									14,093	15,047	1,663
Total assets	636,025				308,141				636,025	308,141
Capital Expenditures									9,042	6,940	4,744
Depreciation and Amortization Expense									19,746	12,382	9,113
Restructuring charges									1,832	1,387	5,245
Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									487,076	349,189	286,594
Net Sales									487,076	349,189	286,594
Income (loss) from operations									14,093	15,047	1,663
Total assets	636,025				308,141				636,025	308,141	275,189
Capital Expenditures									9,042	6,940	4,744
Depreciation and Amortization Expense									19,746	12,382	9,113
Restructuring charges									1,832	1,387	5,245
Power Solutions [Member]
Summary of key financial data [Abstract]
Total assets	203,700								203,700
Connectivity Solutions [Member]
Summary of key financial data [Abstract]
Total assets	133,100								133,100
2012-2014 Acquired Companies [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									218,864	79,361	3,202
Income (loss) from operations									9,727	9,083	-85
North America [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									217,258	116,548	126,469
Net Sales									248,007	128,472	138,966
Income (loss) from operations									-4,465	-1,560	1,336
Total assets	311,298				117,261				311,298	117,261	84,609
Capital Expenditures									3,862	2,064	2,455
Depreciation and Amortization Expense									7,921	4,282	4,081
Restructuring charges									1,539	963	4,558
North America [Member] | Power Solutions [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									73,530	0	0
Income (loss) from operations									-712	0	0
North America [Member] | Connectivity Solutions [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									28,242	0	0
Income (loss) from operations									-2,808	0	0
North America [Member] | Array [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									6,842	2,074	0
Income (loss) from operations									-801	-936	0
North America [Member] | 2012-2014 Acquired Companies [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									108,614	2,074	0
Income (loss) from operations									-4,321	-936	0
Asia [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									201,338	193,647	128,319
Net Sales									275,765	225,151	167,756
Income (loss) from operations									13,338	15,356	-42
Total assets	254,822				148,780				254,822	148,780	148,351
Capital Expenditures									4,089	4,551	2,003
Depreciation and Amortization Expense									8,143	6,540	4,076
Restructuring charges									0	249	612
Asia [Member] | Power Solutions [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									3,401	0	0
Income (loss) from operations									-3,603	0	0
Asia [Member] | Connectivity Solutions [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									2,469	0	0
Income (loss) from operations									493	0	0
Asia [Member] | TRP [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									66,082	65,141	0
Income (loss) from operations									13,152	9,007	0
Asia [Member] | 2012-2014 Acquired Companies [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									71,952	65,141	0
Income (loss) from operations									10,042	9,007	0
Europe [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									68,480	38,994	31,806
Net Sales									114,748	40,742	33,329
Income (loss) from operations									5,220	1,251	369
Total assets	69,905				42,100				69,905	42,100	42,229
Capital Expenditures									1,091	325	286
Depreciation and Amortization Expense									3,682	1,560	956
Restructuring charges									293	175	75
Europe [Member] | Power Solutions [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									23,882	0	0
Income (loss) from operations									4,882	0	0
Europe [Member] | Connectivity Solutions [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									2,812	0	0
Income (loss) from operations									-167	0	0
Europe [Member] | TRP [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									2,498	1,407	0
Income (loss) from operations									366	289	0
Europe [Member] | GigaCom [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									8	4	57
Income (loss) from operations									-23	-986	-392
Europe [Member] | Fibreco [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									6,197	7,483	2,062
Income (loss) from operations									817	2,101	297
Europe [Member] | Powerbox [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									2,901	3,252	1,083
Income (loss) from operations									-1,869	-392	10
Europe [Member] | 2012-2014 Acquired Companies [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers									38,298	12,146	3,202
Income (loss) from operations									4,006	1,012	-85
Intergeographic Revenues [Member] | Reportable Operating Segments [Member]
Summary of key financial data [Abstract]
Net Sales									-151,444	-45,176	-53,457
United States [Member]
Summary of key financial data [Abstract]
Net Sales									217,258	116,548	126,469
Macao [Member]
Summary of key financial data [Abstract]
Net Sales									195,469	193,647	128,319
Germany [Member]
Summary of key financial data [Abstract]
Net Sales									18,663	16,585	14,165
United Kingdom [Member]
Summary of key financial data [Abstract]
Net Sales									22,852	16,538	13,203
All Other Foreign Countries [Member]
Summary of key financial data [Abstract]
Net Sales									$17,598	$5,871	$4,438

Segments_Entity_Wide_Informati

Segments, Entity Wide Information (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
									Customer	Customer	Customer
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales	$148,650	$156,341	$99,439	$82,646	$91,016	$101,164	$93,981	$63,028	$487,076	$349,189	$286,594
Long-lived Assets by Geographic Location [Abstract]
Long-Lived Assets	104,361				54,344				104,361	54,344
Net sales to major customer [Abstract]
Number of customers representing sales in excess of ten percent									1	2	2
Revenue from major customers									76,400	103,300	70,600
Revenue from major customers, percentage (in hundredths)									15.70%	29.60%	24.60%
Reportable Operating Segments [Member]
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales									487,076	349,189	286,594
Net sales to major customer [Abstract]
Revenue from major customers									487,076	349,189	286,594
Connectivity Solutions [Member]
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales									152,954	111,653	109,245
Magnetic Solutions [Member]
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales									174,255	170,166	100,529
Power Solutions and Protection [Member]
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales									159,867	67,370	76,820
United States [Member]
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales									217,258	116,548	126,469
Long-lived Assets by Geographic Location [Abstract]
Long-Lived Assets	43,932				30,102				43,932	30,102
Macao [Member]
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales									195,469	193,647	128,319
China [Member]
Long-lived Assets by Geographic Location [Abstract]
Long-Lived Assets	43,174				20,985				43,174	20,985
United Kingdom [Member]
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales									22,852	16,538	13,203
Long-lived Assets by Geographic Location [Abstract]
Long-Lived Assets	2,536				1,802				2,536	1,802
Germany [Member]
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales									18,663	16,585	14,165
Switzerland [Member]
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales									15,236	0	0
Long-lived Assets by Geographic Location [Abstract]
Long-Lived Assets	3,321				0				3,321	0
Slovakia [Member]
Long-lived Assets by Geographic Location [Abstract]
Long-Lived Assets	9,675				0				9,675	0
North America [Member] | Reportable Operating Segments [Member]
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales									248,007	128,472	138,966
Net sales to major customer [Abstract]
Revenue from major customers									217,258	116,548	126,469
North America [Member] | Array [Member] | Reportable Operating Segments [Member]
Net sales to major customer [Abstract]
Revenue from major customers									6,842	2,074	0
Asia [Member]
Long-lived Assets by Geographic Location [Abstract]
Percentage of identifiable assets (in hundredths)	35.10%								35.10%
Asia [Member] | Reportable Operating Segments [Member]
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales									275,765	225,151	167,756
Net sales to major customer [Abstract]
Revenue from major customers									201,338	193,647	128,319
Asia [Member] | TRP [Member] | Reportable Operating Segments [Member]
Net sales to major customer [Abstract]
Revenue from major customers									66,082	65,141	0
Europe [Member] | Reportable Operating Segments [Member]
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales									114,748	40,742	33,329
Net sales to major customer [Abstract]
Revenue from major customers									68,480	38,994	31,806
Europe [Member] | TRP [Member] | Reportable Operating Segments [Member]
Net sales to major customer [Abstract]
Revenue from major customers									2,498	1,407	0
Intergeographic Revenues [Member] | Reportable Operating Segments [Member]
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales									-151,444	-45,176	-53,457
All Other Foreign Countries [Member]
Net Sales To External Customers By Geographic Area And Major Product Line [Abstract]
Consolidated net sales									17,598	5,871	4,438
Long-lived Assets by Geographic Location [Abstract]
Long-Lived Assets	$1,723				$1,455				$1,723	$1,455

Retirement_Fund_and_Profit_Sha2

Retirement Fund and Profit Sharing Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Contribution Plan Disclosure [Line Items]
Employer match of the first 1% of compensation contributed by participants (in hundredths)	100.00%
Percentage of participant contribution under condition one (in hundredths)	1.00%
Employer match of the next 5% compensation contributed by participants (in hundredths)	50.00%
Percentage of employee deferrals under condition two (in hundredth)	5.00%
Maximum employee deferral contribution under Asia Retirement Fund (in hundredths)	5.00%
Minimum employer matching contribution (in hundredths)	5.00%
Employer matching contribution (in hundredths)	7.00%
Amounts recognized in accumulated other comprehensive loss, pretax:
Total amounts recognized in accumulated other comprehensive loss	$3,026,000	$1,541,000	$2,610,000
SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension expense	1,300,000	1,300,000	1,100,000
Normal retirement age	65 years
Number of years of service	20 years
Number of years of plan participation	5 years
Percentage of average base compensation payable as normal retirement benefit under the plan (in hundredths)	40.00%
Early retirement age	55 years
Number of consecutive calendar years of plan participation to calculate average base compensation	20 years
Number of monthly payments under the death benefit of the plan	120 months
Minimum number of monthly payments entitled to beneficiary in case participant dies prior to receiving one hundred twenty monthly payments	60 months
Period for which beneficiary is entitled to receive benefit	shorter of (i) the time necessary to complete 120 monthly payments or (ii) 60 months
Percentage of participant's annual base salary received by beneficiary for one year from date of death (in hundredths)	100.00%
Period for which beneficiary will receive hundred percent annual base salary	1 year
Percentage of participant's annual base salary received by beneficiary for years two through five following date of death (in hundredths)	50.00%
Period for which beneficiary will receive fifty percent annual base salary	4 years
Components of SERP expense [Abstract]
Service Cost	542,000	556,000	438,000
Interest Cost	541,000	448,000	417,000
Net amortization	182,000	307,000	230,000
Net periodic benefit cost	1,265,000	1,311,000	1,085,000
Summary of information about changes in plan assets, benefit obligation, and the funded status [Abstract]
Fair value of plan assets, beginning of period	0	0
Company contributions	16,000	0
Benefits paid	-16,000	0
Fair value of plan assets, end of period	0	0	0
Benefit obligation January 1	10,830,000	11,045,000
Service cost	542,000	556,000	438,000
Interest cost	541,000	448,000	417,000
Plan amendments	0	502,000
Benefits paid	-16,000	0
Actuarial (gains) losses	2,308,000	-1,721,000
Benefit obligation, December 31	14,205,000	10,830,000	11,045,000
Underfunded status, December 31	-14,205,000	-10,830,000
Accumulated benefit obligation	12,100,000	9,200,000
Fair value of life insurance policies and marketable securities held in a rabbi trust	12,300,000	11,900,000
Estimated net loss and prior service cost that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year	400,000
Expected employer contributions in next fiscal year	100,000
Expected future benefit payments [Abstract]
2015	63,000
2016	267,000
2017	267,000
2018	267,000
2019	477,000
2020 - 2024	3,876,000
Amounts recognized in accumulated other comprehensive loss, pretax:
Prior service cost	1,048,000	1,230,000
Net loss	3,302,000	1,004,000
Total amounts recognized in accumulated other comprehensive loss	4,350,000	2,234,000
Net periodic benefit cost
Discount rate (in hundredths)	5.00%	4.00%	4.50%
Rate of compensation increase (in hundredths)	3.00%	3.00%	3.00%
Benefit obligation
Discount rate (in hundredths)	4.00%	5.00%	4.00%
Rate of compensation increase (in hundredths)	3.00%	3.00%	3.00%
Common Class A [Member]
Defined Contribution Plan Disclosure [Line Items]
Shares owned by plan (in shares)	14,253
Common Class B [Member]
Defined Contribution Plan Disclosure [Line Items]
Shares owned by plan (in shares)	178,239
Retirement Fund [Member]
Defined Contribution Plan Disclosure [Line Items]
Compensation expenses	300,000	300,000	300,000
Retirement Fund [Member] | Common Class A [Member]
Defined Contribution Plan Disclosure [Line Items]
Shares owned by plan (in shares)	3,323
Retirement Fund [Member] | Common Class B [Member]
Defined Contribution Plan Disclosure [Line Items]
Shares owned by plan (in shares)	17,342
401K Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Compensation expenses	$800,000	$400,000	$500,000

Sharebased_Compensation_Detail

Share-based Compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax stock based compensation cost	$2,717,000	$1,879,000	$1,767,000
Percentage of increments earned for share awards (in hundredths)	25.00%
Amortization period for market value of common stock awarded	5 years
Restricted Stock [Member]
Shares [Roll Forward]
Outstanding, beginning of period (in shares)	412,350
Granted (in shares)	378,000
Vested (in shares)	-120,175
Forfeited (in shares)	-26,900
Outstanding, end of period (in shares)	643,275	412,350
Weighted Average Award Price [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$18.85
Granted (in dollars per share)	$23.57
Vested (in dollars per share)	$18.69
Forfeited (in dollars per share)	$22.03
Outstanding, end of period (in dollars per share)	$21.52	$18.85
Weighted Average Remaining Contractual Term [Abstract]
Outstanding	3 years 9 months 18 days	3 years 4 months 24 days
Pretax unrecognized compensation cost	$10,000,000
Period over which compensation cost is expected to be recognized	4 years 7 months 6 days
Restricted Stock [Member] | Common Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued (in shares)	378,000	162,200	130,000
2011 Equity Compensation Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan (in shares)	1,400,000
Common shares available for future issuance (in shares)	766,500

Common_Stock_Details

Common Stock (Details) (USD $)	12 Months Ended			24 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Class of Stock [Line Items]
Cost of common stock purchased and retired		$3,356,000	$6,644,000
Minimum percentage of outstanding common stock held by two shareholders (in hundredths)	10.00%
Minimum percentage of common stock needs to held by shareholders having more than ten percent of Class A common stock as per class B Protection clause (in hundredths)	10.00%
Number of days from trigger date to purchase Class B common shares	90 days
Percentage of common stock held by shareholder one (in hundredths)	23.50%
Percentage of common stock held by shareholder two (in hundredths)	11.00%
Percentage shareholding of class B considered as per class B Protection clause	below 10%
Common stock dividends declared	3,200,000	3,100,000	3,200,000
Class A [Member]
Class of Stock [Line Items]
Common stock purchased and retired (in shares)	0
Common stock repurchased during the period (in shares)			0
Number of shareholders with ownership in excess of ten percent	2
Common stock dividends declared each quarter (in dollars per share)	$0.06	$0.06	$0.06
Class B [Member]
Class of Stock [Line Items]
Authorized amount of repurchase of outstanding Class B common shares			10,000,000
Common stock purchased and retired (in shares)	0	547,366	368,723
Cost of common stock purchased and retired			$6,600,000	$10,000,000
Common stock repurchased during the period (in shares)			0
Common stock dividends declared each quarter (in dollars per share)	$0.07	$0.07	$0.07

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Future minimum lease payments for operating leases [Abstract]
2015	$8,295,000
2016	5,972,000
2017	4,472,000
2018	2,164,000
2019	1,940,000
Thereafter	4,025,000
Total future minimum lease payments for operating leases	26,868,000
Rent expense for leases	7,500,000	4,900,000	3,400,000
Other commitments [Abstract]
Outstanding purchase orders related to raw materials	50,400,000	23,400,000
Outstanding purchase orders related to capital expenditures	3,700,000	3,000,000
Loss Contingencies [Line Items]
Payment to SynQor	10,900,000
Amount received from customer	2,100,000
Subsequent Event [Line Items]
Noncurrent liability and offsetting indemnification asset	12,000,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Noncurrent liability and offsetting indemnification asset	12,000,000
SynQor, Inc [Member]
Loss Contingencies [Line Items]
Number of defendants		11
Damages awarded	$700,000

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive (Loss) Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated other comprehensive loss [Abstract]
Foreign currency translation adjustment	($9,365)		$1,904		$927
Unrealized holding gain on available-for-sale securities, net of taxes of $259, $169 and $161 as of December 31, 2014, 2013 and 2012	429		282		256
Unfunded SERP liability, net of taxes of ($1,325), $(693) and ($1,151) as of December 31, 2014, 2013 and 2012	-3,026		-1,541		-2,610
Accumulated other comprehensive (loss) income	-11,962		645
Accumulated other comprehensive loss, tax [Abstract]
Unrealized holding gains (losses) on available-for-sale securities, tax	259		169		161
Change in unfunded SERP liability, tax	-1,325		-693		-1,151
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance at beginning of period	645		-1,427
Other comprehensive income (loss) before reclassifications	-12,789		1,825
Amounts reclassified from accumulated other comprehensive income (loss)	182		247
Net current period other comprehensive income (loss)	-12,607		2,072
Balance at end of period	-11,962		645
Foreign Currency Translation Adjustment [Member]
Accumulated other comprehensive loss [Abstract]
Accumulated other comprehensive (loss) income	-9,365		1,904
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance at beginning of period	1,904		927
Other comprehensive income (loss) before reclassifications	-11,269		977
Amounts reclassified from accumulated other comprehensive income (loss)	0		0
Net current period other comprehensive income (loss)	-11,269		977
Balance at end of period	-9,365		1,904
Unrealized Holding Gains on Available-for-Sale Securities [Member]
Accumulated other comprehensive loss [Abstract]
Accumulated other comprehensive (loss) income	429		282
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance at beginning of period	282		256
Other comprehensive income (loss) before reclassifications	147		87
Amounts reclassified from accumulated other comprehensive income (loss)	0		-61	[1]
Net current period other comprehensive income (loss)	147		26
Balance at end of period	429		282
Unfunded SERP Liability [Member]
Accumulated other comprehensive loss [Abstract]
Accumulated other comprehensive (loss) income	-3,026		-1,541
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]
Balance at beginning of period	-1,541		-2,610
Other comprehensive income (loss) before reclassifications	-1,667		761
Amounts reclassified from accumulated other comprehensive income (loss)	182	[2]	308	[2]
Net current period other comprehensive income (loss)	-1,485		1,069
Balance at end of period	($3,026)		($1,541)
[1]	This reclassification relates to the gain on sale of SERP investments during the third quarter of 2013. This is reflected as a gain on sale of investment in the consolidated statements of operations.
[2]	This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP plan. This expense is allocated between cost of sales and selling, general and administrative expense based upon the employment classification of the plan participants.

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Related Party Transactions [Abstract]
Inventory purchase payment from joint venture	$4.30
Joint venture liability	$0.90

Selected_Quarterly_Financial_D2

Selected Quarterly Financial Data (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected quarterly financial data [Abstract]
Net sales	$148,650	$156,341	$99,439	$82,646	$91,016	$101,164	$93,981	$63,028	$487,076	$349,189	$286,594
Cost of sales	120,781	128,250	81,493	68,576	73,108	81,132	78,717	53,932	399,100	286,952	240,115
Net earnings	2,020	1,507	3,065	2,503	7,397	7,380	1,689	-558	9,095	15,908	2,373
Net earnings (Loss) per share [Abstract]
Restructuring charges									1,832	1,387	5,245
Class A [Member]
Selected quarterly financial data [Abstract]
Net earnings									1,580	2,868	372
Net earnings (Loss) per share [Abstract]
Common share - basic and diluted (in dollars per share)	$0.16	$0.12	$0.25	$0.20	$0.61	$0.62	$0.14	($0.05)	$0.73	$1.32	$0.17
Class B [Member]
Selected quarterly financial data [Abstract]
Net earnings									$7,515	$13,040	$2,001
Net earnings (Loss) per share [Abstract]
Common share - basic and diluted (in dollars per share)	$0.17	$0.13	$0.27	$0.22	$0.65	$0.65	$0.15	($0.05)	$0.79	$1.41	$0.21

Subsequent_Event_Details

Subsequent Event (Details) (Subsequent Event [Member], Network Power Systems [Member], USD $)	0 Months Ended
In Millions, unless otherwise specified	Jan. 23, 2015
Subsequent Event [Member] | Network Power Systems [Member]
Subsequent Event [Line Items]
Proceeds from sale of business	$9
Proceeds from sale of business in escrow	$1
Number of months of manufacturing service agreement	24 months

VALUATION_AND_QUALIFYING_ACCOU

VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$941		$743		$771
Charged to costs and expenses	1,434		325		-123
Charged to other accounts	0	[1]	50	[1]	109	[1]
Deductions	-386	[2]	-177	[2]	-14	[2]
Balance at end of period	1,989		941		743
Allowance for Excess and Obsolete Inventory [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	3,941		5,490		4,776
Charged to costs and expenses	4,438		-85		1,345
Charged to other accounts	-1	[1]	7	[1]	3	[1]
Deductions	-1,569	[2]	-1,471	[2]	-634	[2]
Balance at end of period	6,809		3,941		5,490
Deferred Tax Assets - Valuation Allowances [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	1,955		1,874		1,232
Charged to costs and expenses	4,766		308		651
Charged to other accounts	0	[1]	0	[1]	0	[1]
Deductions	-29	[2]	-227	[2]	-9	[2]
Balance at end of period	$6,692		$1,955		$1,874
[1]	Includes foreign currency translation adjustments
[2]	Write offs