Diodes (DIOD) 10-Q 11 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	4-May-15
Document And Entity Information [Abstract]
Document type	10-Q
Document period end date	31-Mar-15
Amendment flag	FALSE
Entity registrant name	DIODES INC /DEL/
Entity central index key	29002
Current fiscal year end date	-19
Entity filer category	Large Accelerated Filer
Entity common stock shares outstanding		47,974,864
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	DIOD

CONSOLIDATED_CONDENSED_BALANCE

CONSOLIDATED CONDENSED BALANCE SHEETS (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
CURRENT ASSETS
Cash and cash equivalents	$222,113	$243,000
Short-term investments	26,722	11,726
Accounts receivable, net	177,628	188,248
Inventories	187,379	182,026
Deferred income taxes, current	11,301	11,295
Prepaid expenses and other	46,455	50,510
Total current assets	671,598	686,805
PROPERTY, PLANT AND EQUIPMENT, net	325,278	309,931
DEFERRED INCOME TAXES, non-current	32,556	32,550
OTHER ASSETS
Goodwill	79,665	81,229
Intangible assets, net	42,663	45,028
Other	23,270	23,614
Total assets	1,175,030	1,179,157
CURRENT LIABILITIES
Lines of credit and short-term debt	973	1,064
Accounts payable	84,017	79,390
Accrued liabilities	62,513	60,436
Income tax payable	8,047	8,381
Total current liabilities	155,550	149,271
LONG-TERM DEBT, net of current portion	117,734	140,787
OTHER LONG-TERM LIABILITIES	78,918	78,932
Total liabilities	352,202	368,990
COMMITMENTS AND CONTINGENCIES (See Note H)
Diodes Incorporated stockholders' equity
Preferred stock - par value $1.00 per share; 1,000,000 shares authorized; no shares issued or outstanding
Common stock - par value $0.66 2/3 per share; 70,000,000 shares authorized; 47,963,677 and 47,591,092 issued and outstanding at March 31, 2015 and December 31, 2014, respectively	31,977	31,729
Additional paid-in capital	324,023	314,942
Retained earnings	501,138	490,006
Accumulated other comprehensive loss	-76,873	-68,402
Total Diodes Incorporated stockholders' equity	780,265	768,275
Noncontrolling interest	42,563	41,892
Total equity	822,828	810,167
Total liabilities and equity	$1,175,030	$1,179,157

CONSOLIDATED_CONDENSED_BALANCE1

CONSOLIDATED CONDENSED BALANCE SHEETS (Parentheticals) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Preferred stock par value	$1	$1
Preferred stock shares authorized	1,000,000	1,000,000
Preferred stock shares issued	0	0
Preferred stock shares outstanding	0	0
Common stock par value	$0.67	$0.67
Common stock shares authorized	70,000,000	70,000,000
Common stock shares issued	47,963,677	47,591,092
Common stock shares outstanding	47,963,677	47,591,092

CONSOLIDATED_CONDENSED_STATEME

CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
NET SALES	$206,182	$209,986
COST OF GOODS SOLD	142,269	148,405
Gross profit	63,913	61,581
OPERATING EXPENSES
Selling, general and administrative	31,731	32,330
Research and development	13,309	12,920
Other operating expenses	1,970	1,988
Total operating expenses	47,010	47,238
Income from operations	16,903	14,343
OTHER INCOME (EXPENSES)	-939	-1,350
Income before income taxes and noncontrolling interest	15,964	12,993
INCOME TAX PROVISION	4,187	2,547
NET INCOME	11,777	10,446
Less: NET INCOME attributable to noncontrolling interest	-645	-244
NET INCOME attributable to common stockholders	$11,132	$10,202
EARNINGS PER SHARE attributable to common stockholders
Basic	$0.23	$0.22
Diluted	$0.23	$0.21
Number of shares used in computation
Basic	47,667	46,699
Diluted	48,978	47,996

CONSOLIDATED_CONDENSED_STATEME1

CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest [Abstract]
Net income	$11,777	$10,446
Foreign currency translation adjustment	-6,160	-3,936
Unrealized gain (loss) on defined benefit plan, net of tax	-1,813	1,266
Unrealized foreign currency gain (loss), net of tax	-498	79
Comprehensive income	3,306	7,855
Less: Comprehensive income attributable to noncontrolling interest	-645	-244
Total comprehensive income attributable to common stockholders	$2,661	$7,611

CONSOLIDATED_CONDENSED_STATEME2

CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net cash provided by operating activities	$38,568	$46,118
CASH FLOWS FROM INVESTING ACTIVITIES
Decrease in restricted cash	486
Purchases of property, plant and equipment	-23,539	-11,817
Purchases of short-term investments	-24,985
Proceeds from sale of equity securities and short-term investments	10,007	2,315
Other	-148	1,695
Net cash used in investing activities	-38,179	-7,807
CASH FLOWS FROM FINANCING ACTIVITIES
Advances on lines of credit and short-term debt	965	2,094
Repayments on lines of credit and short-term debt	-1,067	-5,337
Repayments of long-term debt	-23,071	-17,277
Net proceeds from issuance of common stock	5,649	280
Other	-88	-82
Net cash used in financing activities	-17,612	-20,322
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	-3,664	-2,982
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-20,887	15,007
CASH AND CASH EQUIVALENTS, beginning of period	243,000	196,635
CASH AND CASH EQUIVALENTS, end of period	222,113	211,642
Non-cash financing activities:
Property, plant and equipment purchased on accounts payable	($10,281)	($547)

Nature_of_Operations_Basis_of_

Nature of Operations, Basis of Presentation and Recently Issued Accounting Pronouncements	3 Months Ended
	Mar. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Operations, Basis of Presentation and Recently Issued Accounting Pronouncements	NOTE A – Nature of Operations, Basis of Presentation and Recently Issued Accounting Pronouncements
	Nature of Operations
	Diodes Incorporated, together with its subsidiaries (collectively, the “Company”, “we” or “our”), is a leading global manufacturer and supplier of high-quality, application specific standard products within the broad discrete, logic and analog semiconductor markets, serving the consumer electronics, computing, communications, industrial and automotive markets throughout Asia, North America and Europe.
	Basis of Presentation
	The accompanying unaudited consolidated condensed financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S.”) (“GAAP”) for interim financial information and with the instructions to Form 10-Q. They do not include all information and footnotes necessary for a fair presentation of financial position, operating results and cash flows in conformity with U.S. GAAP for complete financial statements. These consolidated condensed financial statements should be read in conjunction with the consolidated financial statements and related notes contained in the our Annual Report on Form 10-K for the year ended December 31, 2014. All significant intercompany balances and transactions have been eliminated in consolidation. In the opinion of management, all adjustments (consisting of normal recurring adjustments and accruals) considered necessary for a fair presentation of the operating results for the period presented have been included in the interim period. Operating results for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for other interim periods or the year ending December 31, 2015. The consolidated condensed financial data at December 31, 2014 is derived from audited financial statements included in the our Annual Report on Form 10-K for the year ended December 31, 2014, filed on March 2, 2015.
	The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from these estimates. As permitted under U.S. GAAP, interim accounting for certain expenses, including income taxes, are based on full year forecasts. For interim financial reporting purposes, income taxes are recorded based upon estimated annual effective income tax rates taking into consideration discrete items occurring in a quarter.
	Certain prior year’s balances have been reclassified to conform to the current financial statement presentation.
	Recently Issued Accounting Pronouncements
	In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. Under ASU 2014-08, only disposals that represent a strategic shift that has (or will have) a major effect on the entity’s results and operations would qualify as discontinued operations, which could include a disposal of a major geographical area, a major line of business, a major equity method investment, or other major parts of an entity. ASU 2014-08 also expands the disclosure requirements for disposals of operations to include more information about assets, liabilities, income and expenses and requires entities to disclose information about disposals of individually significant components. ASU 2014-08 is effective in the first quarter of 2015, with early adoption permitted and could impact the Company’s consolidated financial results in the event of a transaction as described above.
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606).  ASU 2014-09 is based on the principle that revenue is recognized to depict the transfer of goods or 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. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract.  ASU 2014-09 was originally effective in the first quarter of 2017, but in April 2015 the SEC issued a proposal to defer the effective date to the first quart of 2018.  Under this proposal, early adoption is permitted as of the original effective time period of first quarter of 2017 and requires either a retrospective or a modified retrospective approach to adoption.  The Company has not yet selected a transition method and is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	NOTE B – Earnings Per Share
	Basic earnings per share is calculated by dividing net income attributable to common stockholders by the weighted-average number of shares of Common Stock outstanding during the period. Diluted earnings per share is calculated similarly but includes potential dilution from the exercise of stock options and stock awards, except when the effect would be anti-dilutive.
	The computation of basic and diluted earnings per common share is as follows (in thousands, except per share data):
		Three Months Ended
		March 31,
		2015		2014
	BASIC
	Weighted average number of common shares outstanding		47,667		46,699
	used in computing basic earnings per share
	Net income attributable to common stockholders	$	11,132	$	10,202
	Earnings per share attributable to common stockholders	$	0.23	$	0.22
	DILUTED
	Weighted average number of common shares outstanding		47,667		46,699
	used in computing basic earnings per share
	Add:  Dilutive effect of stock options and stock awards outstanding		1,311		1,297
			48,978		47,996
	Net income attributable to common stockholders	$	11,132	$	10,202
	Earnings per share attributable to common stockholders	$	0.23	$	0.21

Inventories

Inventories	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Inventories	NOTE C – Inventories
	Inventories stated at the lower of cost or market value are as follows (in thousands):
		March 31,		December 31,
		2015		2014
	Raw materials	$	81,508	$	73,564
	Work-in-progress		45,010		42,417
	Finished goods		60,861		66,045
	Total	$	187,379	$	182,026

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	NOTE D – Goodwill and Intangible Assets
	Changes in goodwill are as follows (in thousands):
	Balance at December 31, 2014	$	81,229
	Foreign currency translation adjustment		(1,564	)
	Balance at March 31, 2015	$	79,665
	Intangible assets are as follows (in thousands):
		March 31,			December 31,
		2015			2014
	Intangible assets subject to amortization:
	Gross carrying amount	$	86,929		$	86,928
	Accumulated amortization		(42,088	)		(40,164	)
	Foreign currency translation adjustment		(7,794	)		(7,471	)
	Total		37,047			39,293
	Intangible assets with indefinite lives:
	Gross carrying amount		6,403			6,403
	Foreign currency translation adjustment		(787	)		(668	)
	Total		5,616			5,735
	Total intangible assets, net	$	42,663		$	45,028
	Amortization expense related to intangible assets subject to amortization was approximately $2 million for both the three months ended March 31, 2015 and 2014.

Income_Tax_Provision

Income Tax Provision	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Tax Provision	NOTE E – Income Tax Provision
	Income tax expense of approximately $4 million and $3 million was recorded for the three months ended March 31, 2015 and 2014, respectively. This resulted in an effective tax rate of 26.2% for the three months ended March 31, 2015, as compared to 19.6% in the same period last year and compared to 23.7% for the full year of 2014.   The effective tax rate for the three months ended March 31, 2015 includes an immaterial charge for various discrete items. The estimated annual tax rate for 2015 is expected to be approximately 25%, excluding discrete items.  Our effective tax rates for the three months ended March 31, 2015 and 2014, excluding discrete items, were lower than the U.S. statutory tax rate of 35%, principally from the impact of income in lower-taxed jurisdictions.
	For the three months ended March 31, 2015, we reported domestic and foreign pre-tax income/(loss) of approximately $(6) million and $22 million, respectively. Funds repatriated from foreign subsidiaries to the U.S. may be subject to federal and state income taxes. We intend to permanently reinvest overseas all of our earnings from our foreign subsidiaries, except to the extent such undistributed earnings have previously been subject to US tax; accordingly, deferred U.S. taxes are not recorded on undistributed foreign earnings.
	The impact of tax holidays decreased our tax expense by approximately $1 million for both the three months ended March 31, 2015 and 2014. The benefit of the tax holidays on both basic and diluted earnings per share for both the three months ended March 31, 2015 and 2014 was approximately $0.02.
	We file income tax returns in the U.S. federal jurisdiction and in various state and foreign jurisdictions. We are no longer subject to U.S. federal income tax examinations by tax authorities for tax years before 2007, or for the 2010 tax year.  We are no longer subject to China income tax examinations by tax authorities for tax years before 2004. With respect to state and local jurisdictions and countries outside of the U.S. (other than China), with limited exceptions, we are no longer subject to income tax audits for years before 2006. Although the outcome of tax audits is always uncertain, we believe that adequate amounts of tax, interest and penalties, if any, have been provided in our reserve for any adjustments that may result from tax audits. We recognize accrued interest and penalties related to unrecognized tax benefits in interest expense. As of March 31, 2015, the gross amount of unrecognized tax benefits was approximately $19 million.
	It is reasonably possible that the amount of the unrecognized benefit with respect to certain of our unrecognized tax positions will significantly increase or decrease within the next 12 months. At this time, an estimate of the range of the reasonably possible outcomes cannot be made.

ShareBased_Compensation

Share-Based Compensation	3 Months Ended
	Mar. 31, 2015
Share Based Compensation [Abstract]
Share-Based Compensation	NOTE F – Share-Based Compensation
	The following table shows the total compensation expensed for share-based compensation plans, including stock options and share grants, recognized in the statements of operations (in thousands):
		Three Months Ended
		March 31,
		2015				2014
	Cost of goods sold	$	123			$	96
	Selling, general and administrative		3,205				2,850
	Research and development		352				273
	Total share-based compensation expense	$	3,680			$	3,219
	Stock Options. Stock options generally vest in equal annual installments over a four-year period and expire eight years after the grant date, and expense was estimated on the date of grant using the Black-Scholes-Merton option pricing model.
	The total net cash proceeds received from stock option exercises during the three months ended March 31, 2015 was approximately $6 million. Stock option expense was approximately $1 million for both the three months ended March 31, 2015 and 2014.
	A summary of the stock option grants is as follows:
	Stock Options		Shares (000)				Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (yrs)		Aggregate Intrinsic Value ($000)
	Outstanding at January 1, 2015			2,736			$	21.26		4	$	17,840
	Granted			-				-
	Exercised			(368	)			15.36				5,279
	Forfeited or expired			-				-
	Outstanding at March 31, 2015			2,368			$	22.18		4	$	15,276
	Exercisable at March 31,  2015			1,840			$	21.51		3	$	13,094
	The aggregate intrinsic value in the table above is before applicable income taxes and represents the amount option holders would have received if all options had been exercised on the last business day of the period indicated, based on our closing stock price.
	As of March 31, 2015, total unrecognized share-based compensation expense related to unvested stock options, net of forfeitures, was approximately $5 million, before income taxes, and is expected to be recognized over a weighted average period of approximately 2 years.
	Share Grants. Restricted stock awards and restricted stock units generally vest in equal annual installments over a four-year period.
	Share grant expense for the three months ended March 31, 2015 and 2014 was approximately $3 million and $2 million, respectively.
	A summary of our non-vested share grants is as follows:
	Share Grants		Shares (000)				Weighted Average Grant-Date Fair Value		Aggregate Intrinsic Value ($000)
	Non-vested at January 1, 2015			1,535			$	23.32	$	42,324
	Granted			4				27.35
	Vested			(5	)			24.7		134
	Forfeited			(9	)			25.93
	Non-vested at March 31, 2015			1,525			$	23.67	$	43,544
	As of March 31, 2015, total unrecognized share-based compensation expense related to non-vested stock awards, net of forfeitures, was approximately $17 million, before income taxes, and is expected to be recognized over a weighted average period of approximately 2 years.

Segment_Information_and_Enterp

Segment Information and Enterprise-Wide Disclosure	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Segment Information and Enterprise-Wide Disclosure	NOTE G – Segment Information and Enterprise-Wide Disclosure
	For financial reporting purposes, we operate in a single segment, standard semiconductor products, through our various manufacturing and distribution facilities. We aggregate our products because the products are similar and have similar economic characteristics, use similar production processes and share the same customer type.
	Our primary operations include operations in Asia, North America and Europe.
	Net sales are attributed to geographic areas based on the location of subsidiaries producing the net sales (in thousands):
	Three Months Ended	Asia			North America			Europe			Consolidated
	31-Mar-15
	Total sales	$	191,289		$	39,241		$	43,121		$	273,651
	Inter-company sales		(30,839	)		(16,640	)		(19,990	)		(67,469	)
	Net sales	$	160,450		$	22,601		$	23,131		$	206,182
	Three Months Ended	Asia			North America			Europe			Consolidated
	31-Mar-14
	Total sales	$	190,556		$	35,597		$	41,546		$	267,699
	Inter-company sales		(23,285	)		(14,737	)		(19,691	)		(57,713	)
	Net sales	$	167,271		$	20,860		$	21,855		$	209,986
	Geographic Information
	Net sales were derived from (shipped to) customers located in the following countries (in thousands):
		Net Sales
		for the Three Months						Percentage of
		Ended March 31,						Net Sales
		2015			2014			2015			2014
	China	$	121,767		$	127,458			59	%		61	%
	United States		20,427			19,641			10	%		9	%
	Korea		17,265			20,125			8	%		10	%
	Germany		15,331			14,827			7	%		7	%
	Singapore		14,176			9,618			7	%		5	%
	Taiwan		4,284			6,883			2	%		3	%
	All Others (1)		12,932			11,434			7	%		5	%
	Total	$	206,182		$	209,986			100	%		100	%
	(1)	Represents countries with less than 3% of the total net sales each.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE H – Commitments and Contingencies
	Purchase commitments – As March 31, 2015, we had approximately $16 million in non-cancelable purchase contracts related to capital expenditures, primarily for manufacturing equipment in China.
	Contingencies – From time to time, we are involved in various legal proceedings that arise in the normal course of business. While we intend to defend any lawsuit vigorously, we presently believe that the ultimate outcome of any current pending legal proceeding will not have any material adverse effect on our financial position, cash flows or operating results. However, litigation is subject to inherent uncertainties, and unfavorable rulings could occur. An unfavorable ruling could include monetary damages, which could impact on our business and operating results for the period in which the ruling occurs or future periods.  Based on information available, we evaluate the likelihood of potential outcomes. We record the appropriate liability when the amount is deemed probable and reasonably estimable. In addition, we do not accrue for estimated legal fees and other directly related costs as they are expensed as incurred.  Legal proceedings that we believe are material are disclosed below.
	On September 15, 2014, the United States District Court for the Eastern District of Texas issued an order regarding the putative securities class action entitled Local 731 I.B. of T. Excavators and Pavers Pension Trust Fund v. Diodes, Inc., Civil Action No. 6:13- cv-00247 (E.D. Tex. filed Mar. 15, 2013) (the “Class Action”), granting defendants’ motion to dismiss the Class Action with prejudice. On October 13, 2014, plaintiffs filed a notice of appeal to the order dismissing the Class Action to the United States Court of Appeals for the Fifth Circuit. The appeal is fully briefed.  The Court has not yet set a date for argument.
	On February 20, 2014, a purported stockholder derivative action was filed in the United States District Court for the Eastern District of Texas, entitled Persson v. Keh-Shew Lu, Case No. 4:14-cv-00108-RC-ALM (E.D. Tex. filed Feb. 20, 2014), on behalf of the Company against its directors, in which plaintiff alleges that the Board breached their fiduciary duties by allowing the Company to make allegedly misleading public statements in 2011 regarding the labor market in China and its impact on the Company’s business and prospects, by failing to maintain internal controls and by selling shares of Diodes stock while allegedly in possession of material nonpublic information regarding the labor market in China and its impact on the Company’s business and prospects. The complaint does not seek any damages or other relief from the Company. On April 17, 2014, the Court granted the parties’ unopposed motion to stay this action until such time that the Court rules on defendants’ motion to dismiss in the Class Action. On October 2, 2014, the Court granted the parties’ unopposed motion to extend the stay of this action until 30 days after either the expiration of the appeal period or a final decision by the highest court of appeals regarding the defendants’ motion to dismiss in the Class Action. The defendants intend to defend the action vigorously.

Employee_Benefit_Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2015
General Discussion Of Pension And Other Postretirement Benefits [Abstract]
Employee Benefit Plans	NOTE I – Employee Benefit Plans
	Defined Benefit Plan
	We have a contributory defined benefit plan that covers certain employees in the United Kingdom (“U.K.”). The net pension and supplemental retirement benefit obligations and the related periodic costs are based on, among other things, assumptions regarding the discount rate, estimated return on plan assets and mortality rates. These obligations and related periodic costs are measured using actuarial techniques and assumptions. The projected unit credit method is the actuarial cost method used to compute the pension liabilities and related expenses.
	Net periodic benefit costs associated with the defined benefit plan were less than $1 million for both the three months ended March 31, 2015 and 2014, respectively.
	The following tables set forth the benefit obligation, the fair value of plan assets, and the funded status of our plan (in thousands):
		Defined Benefit Plan
	Change in benefit obligation:
	Balance at December 31, 2014	$	159,715
	Service cost		76
	Interest cost		1,433
	Actuarial loss		8,156
	Benefits paid		(976	)
	Currency changes		(7,841	)
	Benefit obligation at March 31, 2015	$	160,563
	Change in plan assets:
	Fair value of plan assets at December 31, 2014	$	122,780
	Actual return on plan assets		7,497
	Employer contribution		303
	Benefits paid		(976	)
	Currency changes		(6,030	)
	Fair value of plan assets at March 31, 2015	$	123,574
	Underfunded status at March 31, 2015	$	(36,989	)
	Based on an actuarial study performed as of March 31, 2015, the plan is underfunded and a liability is reflected in our consolidated financial statements as a long-term liability. The weighted-average discount rate assumption used to determine benefit obligations as of March 31, 2015 was 3.4%.
	The following weighted-average assumptions were used to determine net periodic benefit costs for the three months ended March 31, 2015:
	Discount rate		3.7	%
	Expected long-term return on plan assets		5.2	%
	During the second quarter of 2012, we adopted a payment plan with the trustees of the defined benefit plan, in which we would pay approximately British Pound (“GBP”) 2 million (approximately $3 million based on a USD:GBP exchange rate of 1.6:1) every year from 2012 through 2019. In 2015, based on the pension deficit, we adopted (as required every three years) an amended payment plan that Zetex had in place with the trustees of the defined benefit plan in which we will pay contributions of approximately GBP 2 million (approximately $3 million based on a USD:GBP exchange rate of 1.6:1) annually through 2030. This revised payment plan resulted in an increase of total required contributions from $13 million to $49 million to match the underfunded status as of March 31, 2015.
	We also have pension plans in Germany and Asia for which the benefit obligation, fair value of the plan assets and the funded status amounts are deemed immaterial and therefore, are not included in the figures or assumptions above.
	Deferred Compensation
	We maintain a Non-Qualified Deferred Compensation Plan (the “Deferred Compensation Plan”) for executive officers, key employees and members of the Board of Directors (the “Board”). The Deferred Compensation Plan allows eligible participants to defer the receipt of eligible compensation, including equity awards, until designated future dates. We offset our obligations under the Deferred Compensation Plan by investing in the actual underlying investments. These investments are classified as trading securities and are carried at fair value. At March 31, 2015, these investments totaled approximately $5 million. All gains and losses in these investments are materially offset by corresponding gains and losses in the Deferred Compensation Plan liabilities.

Related_Parties

Related Parties	3 Months Ended
	Mar. 31, 2015
Related Party Transactions [Abstract]
Related Parties	NOTE J – Related Parties
	We conduct business with two related party companies, Lite-On Semiconductor Corporation and its subsidiaries and affiliates (“LSC”), and Nuvoton Technology Corporation and its subsidiaries and affiliates (collectively, “Nuvoton”). LSC is our largest stockholder, owning approximately 17% of our outstanding Common Stock as of March 31, 2015, and is a member of the Lite-On Group of companies. Raymond Soong, the Chairman of the Board of Directors, is the Chairman of LSC, and is the Chairman of Lite- On Technology Corporation (“LTC”), a significant shareholder of LSC. C.H. Chen, our former President and Chief Executive Officer and currently the Vice Chairman of the Board of Directors, is also Vice Chairman of LSC and a board member of LTC. Dr. Keh-Shew Lu, our President and Chief Executive Officer and a member of our Board of Directors, is a board member of LTC, and a board member of Nuvoton. L.P. Hsu, a member of our Board of Directors serves as a consultant to LTC, and is a supervisor of the board of Nuvoton. We consider our relationships with LSC and Nuvoton to be mutually beneficial, and we plan to continue our strategic alliance with LSC and Nuvoton.
	We also conduct business with a significant company, Keylink International (B.V.I.) Inc. and its subsidiaries and affiliates (collectively, “Keylink”). Keylink is our 5% joint venture partner in our Shanghai assembly and test facilities. In addition, Chengdu Ya Guang Electronic Company Limited (“Ya Guang”) is our 5% joint venture partner in our two Chengdu assembly and test facilities; however, we have no material transactions with Ya Guang. The Audit Committee of the Board reviews all related party transactions for potential conflict of interest situations on an ongoing basis, all in accordance with such procedures as the Audit Committee may adopt from time to time.
	Lite-On Semiconductor Corporation – We sell semiconductor products to LSC and purchase semiconductor products from LSC for subsequent sale, making LSC one of our largest suppliers.
	Net sales to, and purchases from, LSC are as follows (in thousands):
		Three Months Ended
		March 31,
		2015		2014
	Net sales	$	305	$	115
	Purchases	$	6,723	$	7,338
	Keylink International (B.V.I.) Inc. – We sell semiconductor products to Keylink and purchase semiconductor products for subsequent sale. In addition, our subsidiaries in China lease their manufacturing facilities in Shanghai from, and subcontract a portion of our manufacturing process (metal plating and environmental services) to, Keylink. We also pay a consulting fee to Keylink.  The aggregate amounts for these services for both the three months ended March 31, 2015 and 2014 were approximately $4 million.
	Net sales to, and purchases from, Keylink are as follows (in thousands):
		Three Months Ended
		March 31,
		2015		2014
	Net sales	$	2,365	$	2,264
	Purchases	$	1,516	$	1,646
	Nuvoton Technology Corporation – We purchase wafers from Nuvoton that we use in the production of finished goods.
	Net purchases from Nuvoton are as follows (in thousands):
		Three Months Ended
		March 31,
		2015		2014
	Purchases	$	3,434	$	3,336
	Accounts receivable from, and accounts payable to, LSC, Keylink and Nuvoton are as follows (in thousands):
		March 31,		December 31,
		2015		2014
	Accounts receivable
	LSC	$	296	$	215
	Keylink		4,003		4,142
		$	4,299	$	4,357
	Accounts payable
	LSC	$	5,146	$	4,458
	Keylink		5,648		6,472
	Nuvoton		1,427		1,167
		$	12,221	$	12,097

Nature_of_Operations_Basis_of_1

Nature of Operations, Basis of Presentation and Recently Issued Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2015
Nature Of Operations Basis Of Presentation And Recently Issued Accounting Pronouncements [Abstract]
Nature of Operations	Nature of Operations
	Diodes Incorporated, together with its subsidiaries (collectively, the “Company”, “we” or “our”), is a leading global manufacturer and supplier of high-quality, application specific standard products within the broad discrete, logic and analog semiconductor markets, serving the consumer electronics, computing, communications, industrial and automotive markets throughout Asia, North America and Europe.
Basis of Presentation	Basis of Presentation
	The accompanying unaudited consolidated condensed financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S.”) (“GAAP”) for interim financial information and with the instructions to Form 10-Q. They do not include all information and footnotes necessary for a fair presentation of financial position, operating results and cash flows in conformity with U.S. GAAP for complete financial statements. These consolidated condensed financial statements should be read in conjunction with the consolidated financial statements and related notes contained in the our Annual Report on Form 10-K for the year ended December 31, 2014. All significant intercompany balances and transactions have been eliminated in consolidation. In the opinion of management, all adjustments (consisting of normal recurring adjustments and accruals) considered necessary for a fair presentation of the operating results for the period presented have been included in the interim period. Operating results for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for other interim periods or the year ending December 31, 2015. The consolidated condensed financial data at December 31, 2014 is derived from audited financial statements included in the our Annual Report on Form 10-K for the year ended December 31, 2014, filed on March 2, 2015.
	The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from these estimates. As permitted under U.S. GAAP, interim accounting for certain expenses, including income taxes, are based on full year forecasts. For interim financial reporting purposes, income taxes are recorded based upon estimated annual effective income tax rates taking into consideration discrete items occurring in a quarter.
	Certain prior year’s balances have been reclassified to conform to the current financial statement presentation.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements
	In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. Under ASU 2014-08, only disposals that represent a strategic shift that has (or will have) a major effect on the entity’s results and operations would qualify as discontinued operations, which could include a disposal of a major geographical area, a major line of business, a major equity method investment, or other major parts of an entity. ASU 2014-08 also expands the disclosure requirements for disposals of operations to include more information about assets, liabilities, income and expenses and requires entities to disclose information about disposals of individually significant components. ASU 2014-08 is effective in the first quarter of 2015, with early adoption permitted and could impact the Company’s consolidated financial results in the event of a transaction as described above.
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606).  ASU 2014-09 is based on the principle that revenue is recognized to depict the transfer of goods or 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. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract.  ASU 2014-09 was originally effective in the first quarter of 2017, but in April 2015 the SEC issued a proposal to defer the effective date to the first quart of 2018.  Under this proposal, early adoption is permitted as of the original effective time period of first quarter of 2017 and requires either a retrospective or a modified retrospective approach to adoption.  The Company has not yet selected a transition method and is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The computation of basic and diluted earnings per common share is as follows (in thousands, except per share data):
		Three Months Ended
		March 31,
		2015		2014
	BASIC
	Weighted average number of common shares outstanding		47,667		46,699
	used in computing basic earnings per share
	Net income attributable to common stockholders	$	11,132	$	10,202
	Earnings per share attributable to common stockholders	$	0.23	$	0.22
	DILUTED
	Weighted average number of common shares outstanding		47,667		46,699
	used in computing basic earnings per share
	Add:  Dilutive effect of stock options and stock awards outstanding		1,311		1,297
			48,978		47,996
	Net income attributable to common stockholders	$	11,132	$	10,202
	Earnings per share attributable to common stockholders	$	0.23	$	0.21

Inventories_Tables

Inventories (Tables)	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Schedule Of Inventory Current	Inventories stated at the lower of cost or market value are as follows (in thousands):
		March 31,		December 31,
		2015		2014
	Raw materials	$	81,508	$	73,564
	Work-in-progress		45,010		42,417
	Finished goods		60,861		66,045
	Total	$	187,379	$	182,026

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Changes in Goodwill	Changes in goodwill are as follows (in thousands):
	Balance at December 31, 2014	$	81,229
	Foreign currency translation adjustment		(1,564	)
	Balance at March 31, 2015	$	79,665
Schedule of Intangible Assets	Intangible assets are as follows (in thousands):
		March 31,			December 31,
		2015			2014
	Intangible assets subject to amortization:
	Gross carrying amount	$	86,929		$	86,928
	Accumulated amortization		(42,088	)		(40,164	)
	Foreign currency translation adjustment		(7,794	)		(7,471	)
	Total		37,047			39,293
	Intangible assets with indefinite lives:
	Gross carrying amount		6,403			6,403
	Foreign currency translation adjustment		(787	)		(668	)
	Total		5,616			5,735
	Total intangible assets, net	$	42,663		$	45,028

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2015
Share Based Compensation [Abstract]
Schedule of Share-Based Compensation Expense	The following table shows the total compensation expensed for share-based compensation plans, including stock options and share grants, recognized in the statements of operations (in thousands):
		Three Months Ended
		March 31,
		2015				2014
	Cost of goods sold	$	123			$	96
	Selling, general and administrative		3,205				2,850
	Research and development		352				273
	Total share-based compensation expense	$	3,680			$	3,219
Schedule of Share Based Compensation Stock Options Activity	A summary of the stock option grants is as follows:
	Stock Options		Shares (000)				Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (yrs)		Aggregate Intrinsic Value ($000)
	Outstanding at January 1, 2015			2,736			$	21.26		4	$	17,840
	Granted			-				-
	Exercised			(368	)			15.36				5,279
	Forfeited or expired			-				-
	Outstanding at March 31, 2015			2,368			$	22.18		4	$	15,276
	Exercisable at March 31,  2015			1,840			$	21.51		3	$	13,094
Schedule Of Nonvested Restricted Stock Units Activity	A summary of our non-vested share grants is as follows:
	Share Grants		Shares (000)				Weighted Average Grant-Date Fair Value		Aggregate Intrinsic Value ($000)
	Non-vested at January 1, 2015			1,535			$	23.32	$	42,324
	Granted			4				27.35
	Vested			(5	)			24.7		134
	Forfeited			(9	)			25.93
	Non-vested at March 31, 2015			1,525			$	23.67	$	43,544

Segment_Information_and_Enterp1

Segment Information and Enterprise-Wide Disclosure (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Schedule of Net Sales from External Customers and Long Lived Assets by Geographical Areas	Net sales are attributed to geographic areas based on the location of subsidiaries producing the net sales (in thousands):
	Three Months Ended	Asia			North America			Europe			Consolidated
	31-Mar-15
	Total sales	$	191,289		$	39,241		$	43,121		$	273,651
	Inter-company sales		(30,839	)		(16,640	)		(19,990	)		(67,469	)
	Net sales	$	160,450		$	22,601		$	23,131		$	206,182
	Three Months Ended	Asia			North America			Europe			Consolidated
	31-Mar-14
	Total sales	$	190,556		$	35,597		$	41,546		$	267,699
	Inter-company sales		(23,285	)		(14,737	)		(19,691	)		(57,713	)
	Net sales	$	167,271		$	20,860		$	21,855		$	209,986
Schedule of Net Sales by Countries	Net sales were derived from (shipped to) customers located in the following countries (in thousands):
		Net Sales
		for the Three Months						Percentage of
		Ended March 31,						Net Sales
		2015			2014			2015			2014
	China	$	121,767		$	127,458			59	%		61	%
	United States		20,427			19,641			10	%		9	%
	Korea		17,265			20,125			8	%		10	%
	Germany		15,331			14,827			7	%		7	%
	Singapore		14,176			9,618			7	%		5	%
	Taiwan		4,284			6,883			2	%		3	%
	All Others (1)		12,932			11,434			7	%		5	%
	Total	$	206,182		$	209,986			100	%		100	%
	(1)	Represents countries with less than 3% of the total net sales each.

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2015
General Discussion Of Pension And Other Postretirement Benefits [Abstract]
Schedule of Benefit Obligation, Fair Value of Plan Assets, and Funded Status of our Plan	The following tables set forth the benefit obligation, the fair value of plan assets, and the funded status of our plan (in thousands):
		Defined Benefit Plan
	Change in benefit obligation:
	Balance at December 31, 2014	$	159,715
	Service cost		76
	Interest cost		1,433
	Actuarial loss		8,156
	Benefits paid		(976	)
	Currency changes		(7,841	)
	Benefit obligation at March 31, 2015	$	160,563
	Change in plan assets:
	Fair value of plan assets at December 31, 2014	$	122,780
	Actual return on plan assets		7,497
	Employer contribution		303
	Benefits paid		(976	)
	Currency changes		(6,030	)
	Fair value of plan assets at March 31, 2015	$	123,574
	Underfunded status at March 31, 2015	$	(36,989	)
Schedule of Assumptions Used	The following weighted-average assumptions were used to determine net periodic benefit costs for the three months ended March 31, 2015:
	Discount rate		3.7	%
	Expected long-term return on plan assets		5.2	%

Related_Parties_Tables

Related Parties (Tables)	3 Months Ended
	Mar. 31, 2015
Related Party Transaction [Line Items]
Schedule of Account Receivable and Payable of Related Party Transactions	Accounts receivable from, and accounts payable to, LSC, Keylink and Nuvoton are as follows (in thousands):
		March 31,		December 31,
		2015		2014
	Accounts receivable
	LSC	$	296	$	215
	Keylink		4,003		4,142
		$	4,299	$	4,357
	Accounts payable
	LSC	$	5,146	$	4,458
	Keylink		5,648		6,472
	Nuvoton		1,427		1,167
		$	12,221	$	12,097
Lite On Semiconductor
Related Party Transaction [Line Items]
Schedule Net Sales and Purchases of Related Party Transactions	Net sales to, and purchases from, LSC are as follows (in thousands):
		Three Months Ended
		March 31,
		2015		2014
	Net sales	$	305	$	115
	Purchases	$	6,723	$	7,338
Keylink
Related Party Transaction [Line Items]
Schedule Net Sales and Purchases of Related Party Transactions	Net sales to, and purchases from, Keylink are as follows (in thousands):
		Three Months Ended
		March 31,
		2015		2014
	Net sales	$	2,365	$	2,264
	Purchases	$	1,516	$	1,646
Nuvoton
Related Party Transaction [Line Items]
Schedule Net Sales and Purchases of Related Party Transactions	Net purchases from Nuvoton are as follows (in thousands):
		Three Months Ended
		March 31,
		2015		2014
	Purchases	$	3,434	$	3,336

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Details)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings per share reconciliation disclosure	Basic earnings per share is calculated by dividing net income attributable to common stockholders by the weighted-average number of shares of Common Stock outstanding during the period. Diluted earnings per share is calculated similarly but includes potential dilution from the exercise of stock options and stock awards, except when the effect would be anti-dilutive.

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
BASIC
Weighted average number of common shares outstanding used in computing basic earnings per share	47,667	46,699
Net income attributable to common stockholders	$11,132	$10,202
Earnings per share attributable to common stockholders	$0.23	$0.22
DILUTED
Weighted average number of common shares outstanding used in computing basic earnings per share	47,667	46,699
Add: Dilutive effect of stock options and stock awards outstanding	1,311	1,297
Diluted shares	48,978	47,996
Net income attributable to common stockholders	$11,132	$10,202
Earnings per share attributable to common stockholders	$0.23	$0.21

Inventories_Details

Inventories (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]
Raw materials	$81,508	$73,564
Work-in-progress	45,010	42,417
Finished goods	60,861	66,045
Total	$187,379	$182,026

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Goodwill
Goodwill beginning balance	$81,229
Foreign currency translation adjustment	-1,564
Goodwill ending balance	$79,665

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Intangible assets subject to amortization
Gross carrying amount	$86,929	$86,928
Accumulated amortization	-42,088	-40,164
Foreign currency translation adjustment	-7,794	-7,471
Total	37,047	39,293
Intangible assets with indefinite lives
Gross carrying amount	6,403	6,403
Foreign currency translation adjustment	-787	-668
Total	5,616	5,735
Total intangible assets, net	$42,663	$45,028

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Additional Information (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$2	$2

Income_Tax_Provision_Additiona

Income Tax Provision - Additional Information (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
INCOME TAX PROVISION	$4,187,000	$2,547,000
Effective tax rate	26.20%	19.60%	23.70%
Estimated Annual Income Tax Rate	25.00%
U.S. statutory tax rate	35.00%	35.00%
Domestic pre-tax income/(loss)	-6,000,000
Foreign pre-tax income/(loss)	22,000,000
Tax holidays	1,000,000	1,000,000
Tax holidays basic EPS	$0.02	$0.02
Tax holidays diluted EPS	$0.02	$0.02
Unrecognized tax benefits	$19,000,000
Significant Change in Unrecognized Tax Benefits, Nature of Event	It is reasonably possible that the amount of the unrecognized benefit with respect to certain of our unrecognized tax positions will significantly increase or decrease within the next 12 months.
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range Not Possible	At this time, an estimate of the range of the reasonably possible outcomes cannot be made.

ShareBased_Compensation_Schedu

Share-Based Compensation - Schedule of Share-Based Compensation Expense (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	$3,680	$3,219
Cost of Goods Sold
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	123	96
Selling, General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	3,205	2,850
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	$352	$273

ShareBased_Compensation_Additi

Share-Based Compensation - Additional Information (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash proceeds received from stock option exercises	$6
Stock Option Expense	1	1
Restricted Stock Expense	3	2
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Description	Stock options generally vest in equal annual installments over a four-year period and expire eight years after the grant date
Share-based Compensation Arrangement by Share-based Payment Award, Method of Measuring Cost of Award	Expense was estimated on the date of grant using the Black-Scholes-Merton option pricing model
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	8 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	5
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$17
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years

ShareBased_Compensation_Schedu1

Share-Based Compensation - Schedule of Share Based Compensation Stock Options Activity (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
Stock Options, Shares:
Outstanding Beginning Shares	2,736
Exercised Shares	-368
Outstanding Ending Shares	2,368
Shares Exercisable	1,840
Weighted Average Exercise Price:
Outstanding Beginning Weighted Average Exercise Price	$21.26
Exercised Weighted Average Exercise Price	$15.36
Outstanding Ending Weighted Average Exercise Price	$22.18
Exercisable Weighted Average Exercise Price	$21.51
Weighted Average Remaining Contractual Term:
Outstanding Weighted Average Remaining Contractual Term	4 years
Exercisable Weighted Average Remaining Contractual Term	3 years
Aggregate Intrinsic Value :
Outstanding Intrinsic Value	$17,840
Exercised Intrinsic Value	5,279
Outstanding Intrinsic Value	15,276
Exercisable Intrinsic Value	$13,094

ShareBased_Compensation_Schedu2

Share-Based Compensation - Schedule Of Nonvested Restricted Stock Units Activity (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Summary of the status of non vested share grants [Roll Forward]
Beginning balance nonvested	1,535
Granted	4
Vested	-5
Forfeited	-9
Ending balance nonvested	1,525
Weighted-Average Grant-Date Fair Value [Roll Forward]
Beginning balance nonvested	$23.32
Granted	$27.35
Vested	$24.70
Forfeited	$25.93
Ending balance nonvested	$23.67
Aggregate Intrinsic Value
Balance nonvested	$43,544	$42,324
Vested	$134

Segment_Information_and_Enterp2

Segment Information and Enterprise-Wide Disclosure - Schedule of Net Sales from External Customers and Long Lived Assets by Geographical Areas (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
NET SALES	$206,182	$209,986
Operating Segments
Segment Reporting Information [Line Items]
NET SALES	273,651	267,699
Intersegment Eliminations
Segment Reporting Information [Line Items]
NET SALES	-67,469	-57,713
Asia
Segment Reporting Information [Line Items]
NET SALES	160,450	167,271
Asia | Operating Segments
Segment Reporting Information [Line Items]
NET SALES	191,289	190,556
Asia | Intersegment Eliminations
Segment Reporting Information [Line Items]
NET SALES	-30,839	-23,285
North America
Segment Reporting Information [Line Items]
NET SALES	22,601	20,860
North America | Operating Segments
Segment Reporting Information [Line Items]
NET SALES	39,241	35,597
North America | Intersegment Eliminations
Segment Reporting Information [Line Items]
NET SALES	-16,640	-14,737
Europe
Segment Reporting Information [Line Items]
NET SALES	23,131	21,855
Europe | Operating Segments
Segment Reporting Information [Line Items]
NET SALES	43,121	41,546
Europe | Intersegment Eliminations
Segment Reporting Information [Line Items]
NET SALES	($19,990)	($19,691)

Segment_Information_and_Enterp3

Segment Information and Enterprise-Wide Disclosure - Schedule of Net Sales by Countries (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Segment Reporting Revenue Reconciling Item [Line Items]
NET SALES	$206,182		$209,986
Percentage of net sales	100.00%		100.00%
China
Segment Reporting Revenue Reconciling Item [Line Items]
NET SALES	121,767		127,458
Percentage of net sales	59.00%		61.00%
United States
Segment Reporting Revenue Reconciling Item [Line Items]
NET SALES	20,427		19,641
Percentage of net sales	10.00%		9.00%
Korea
Segment Reporting Revenue Reconciling Item [Line Items]
NET SALES	17,265		20,125
Percentage of net sales	8.00%		10.00%
Germany
Segment Reporting Revenue Reconciling Item [Line Items]
NET SALES	15,331		14,827
Percentage of net sales	7.00%		7.00%
Singapore
Segment Reporting Revenue Reconciling Item [Line Items]
NET SALES	14,176		9,618
Percentage of net sales	7.00%		5.00%
Taiwan
Segment Reporting Revenue Reconciling Item [Line Items]
NET SALES	4,284		6,883
Percentage of net sales	2.00%		3.00%
All Others
Segment Reporting Revenue Reconciling Item [Line Items]
NET SALES	$12,932	[1]	$11,434	[1]
Percentage of net sales	7.00%	[1]	5.00%	[1]
[1]	Represents countries with less than 3% of the total net sales each.

Segment_Information_and_Enterp4

Segment Information and Enterprise-Wide Disclosure - Schedule of Net Sales by Countries (Parenthetical) (Details)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Segment Reporting Revenue Reconciling Item [Line Items]
Percentage of net sales	100.00%		100.00%
All Others
Segment Reporting Revenue Reconciling Item [Line Items]
Percentage of net sales	7.00%	[1]	5.00%	[1]
All Others | Maximum
Segment Reporting Revenue Reconciling Item [Line Items]
Percentage of net sales	3.00%		3.00%
[1]	Represents countries with less than 3% of the total net sales each.

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Commitments And Contingencies [Line Items]
Purchase Commitments	16
Putative Securities Class Action
Commitments And Contingencies [Line Items]
Loss Contingency, Name of Defendant	Diodes, Inc
Loss Contingency, Lawsuit Filing Date	3/15/13
Loss Contingency, Name of Plaintiff	Local 731 I.B. of T. Excavators and Pavers Pension Trust Fund
Stockholder Derivative Action Two
Commitments And Contingencies [Line Items]
Loss Contingency, Name of Defendant	Keh-Shew Lu
Loss Contingency, Lawsuit Filing Date	Feb. 20, 2014
Loss Contingency, Name of Plaintiff	Persson
Loss Contingency, Allegations	on behalf of the Company against its directors, in which plaintiff alleges that the Board breached their fiduciary duties by allowing the Company to make allegedly misleading public statements in 2011 regarding the labor market in China and its impact on the Companybs business and prospects, by failing to maintain internal controls and by selling shares of Diodes stock while allegedly in possession of material nonpublic information regarding the labor market in China and its impact on the Companybs business and prospects.
Number of days given to extend stay of an action after either expiration of an appeal period or a final decision	30 days

Employee_Benefit_Plans_Additio

Employee Benefit Plans - Additional Information (Details)	3 Months Ended			3 Months Ended						3 Months Ended
	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2012	Jun. 30, 2012	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2014
	Deferred Compensation Plan	Before Agreement	After Agreement	Pension Plan, Defined Benefit	Pension Plan, Defined Benefit	Pension Plan, Defined Benefit	Pension Plan, Defined Benefit	Pension Plan, Defined Benefit	Pension Plan, Defined Benefit	Pension Plan, Defined Benefit	Pension Plan, Defined Benefit
	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	GBP (£)	Zetex [Member]	Zetex [Member]	Maximum	Maximum
								USD ($)	GBP (£)	USD ($)	USD ($)
Employee Benefit Plans Additional Information [Abstract]
Defined Benefit Plans, General Information				We have a contributory defined benefit plan that covers certain employees in the United Kingdom (bU.K.b). The net pension and supplemental retirement benefit obligations and the related periodic costs are based on, among other things, assumptions regarding the discount rate, estimated return on plan assets and mortality rates. These obligations and related periodic costs are measured using actuarial techniques and assumptions.
Defined Benefit Plan, Pension, Method to Determine Vested Benefit Obligation				The projected unit credit method is the actuarial cost method used to compute the pension liabilities and related expenses.
Net period benefit costs										$1,000,000	$1,000,000
Deferred Compensation Plan Assets	5,000,000
Deferred Compensation Arrangements, Overall, Description	We maintain a Non-Qualified Deferred Compensation Plan (the bDeferred Compensation Planb) for executive officers, key employees and members of the Board of Directors (the bBoardb). The Deferred Compensation Plan allows eligible participants to defer the receipt of eligible compensation, including equity awards, until designated future dates. We offset our obligations under the Deferred Compensation Plan by investing in the actual underlying investments. These investments are classified as trading securities and are carried at fair value. At March 31, 2015, these investments totaled approximately $5 million. All gains and losses in these investments are materially offset by corresponding gains and losses in the Deferred Compensation Plan liabilities.
Change in Plan Assets [Roll Forward]
Weighted average discount rate benefit obligations				3.40%
Estimated Future Pension Benefit Payments [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year, Description				During the second quarter of 2012, we adopted a payment plan with the trustees of the defined benefit plan, in which we would pay approximately British Pound (bGBPb) 2 million (approximately $3 million based on a USD:GBP exchange rate of 1.6:1) every year from 2012 through 2019. In 2015, based on the pension deficit, we adopted (as required every three years) an amended payment plan that Zetex had in place with the trustees of the defined benefit plan in which we will pay contributions of approximately GBP 2 million (approximately $3 million based on a USD:GBP exchange rate of 1.6:1) annually through 2030. This revised payment plan resulted in an increase of total required contributions from $13 million to $49 million to match the underfunded status as of March 31, 2015.
Defined Benefit Plan, Expected Future Benefit Payments						3,000,000	2,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year One						3,000,000	2,000,000	3,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two						3,000,000	2,000,000	3,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three						3,000,000	2,000,000	3,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four						3,000,000	2,000,000	3,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five						3,000,000	2,000,000	3,000,000
Defined Benefit Plan Expected Future Benefit Payments In Ten Fiscal Years Thereafter								3,000,000	2,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Three Fiscal Years Thereafter						3,000,000	2,000,000
USD:GBP exchange rate						0.625
Defined Benefit Plan Benefit Obligation, Outstanding Balance		$13,000,000	$49,000,000	$160,563,000	$159,715,000

Employee_Benefit_Plans_Schedul

Employee Benefit Plans - Schedule of Changes in Fair Value of Plan Assets (Details) (Pension Plan, Defined Benefit, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Pension Plan, Defined Benefit
Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning	$159,715
Service cost	76
Interest cost	1,433
Actuarial gain	8,156
Benefits paid	-976
Currency changes	-7,841
Benefit obligation - ending	160,563
Change in Plan Assets [Roll Forward]
Fair value of plan assets - beginning	122,780
Actual return	7,497
Employer contribution	303
Benefits paid	-976
Currency changes	-6,030
Fair value of plan assets - ending	123,574
Underfunded status	($36,989)

Employee_Benefit_Plans_Schedul1

Employee Benefit Plans - Schedule of Assumptions Used (Details) (Pension Plan, Defined Benefit)	3 Months Ended
	Mar. 31, 2015
Pension Plan, Defined Benefit
Defined benefit plan, Weighted average assumptions used in calculating net periodic benefit cost [Abstract]
Discount rate	3.70%
Expected long-term return on plan assets	5.20%

Related_Parties_Additional_Inf

Related Parties - Additional Information (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Lite On Semiconductor
Related Party Transaction [Line Items]
Related Party ownership of common stock			17.00%
Related Party Transaction, Description of Transaction	LSC is our largest stockholder, owning approximately 17% of our outstanding Common Stock as of March 31, 2015, and is a member of the Lite-On Group of companies.
Keylink
Related Party Transaction [Line Items]
Related Party ownership of common stock	5.00%
Related Party Transaction, Description of Transaction	Keylink is our 5% joint venture partner in our Shanghai assembly and test facilities.
Related Party Transaction Consulting Fees From Transactions With Related Party	4	$4
Chengdu Ya Guang Electronic Company Limited (bYa Guangb)
Related Party Transaction [Line Items]
Related Party ownership of common stock	5.00%
Related Party Transaction, Description of Transaction	In addition, Chengdu Ya Guang Electronic Company Limited (bYa Guangb) is our 5% joint venture partner in our two Chengdu assembly and test facilities

Related_Parties_Schedule_Net_S

Related Parties - Schedule Net Sales and Purchases of Related Party Transactions (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Lite On Semiconductor
Related Party Transaction [Line Items]
Revenue from related parties	$305	$115
Purchases from related parties	6,723	7,338
Keylink
Related Party Transaction [Line Items]
Revenue from related parties	2,365	2,264
Purchases from related parties	1,516	1,646
Nuvoton
Related Party Transaction [Line Items]
Purchases from related parties	$3,434	$3,336

Related_Parties_Schedule_of_Ac

Related Parties - Schedule of Account Receivable and Payable of Related Party Transactions (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Related Party Transaction [Line Items]
Accounts receivable	$4,299	$4,357
Accounts payable	12,221	12,097
Lite On Semiconductor
Related Party Transaction [Line Items]
Accounts receivable	296	215
Accounts payable	5,146	4,458
Keylink
Related Party Transaction [Line Items]
Accounts receivable	4,003	4,142
Accounts payable	5,648	6,472
Nuvoton
Related Party Transaction [Line Items]
Accounts payable	$1,427	$1,167