Advanced Energy Industries (AEIS) 10-Q 4 Aug 16 2016 Q2 Quarterly report Financial data

Document and Enitity Informatio

Document and Enitity Information - shares	6 Months Ended
	Jun. 30, 2016	Jul. 31, 2016
Document Entity Information [Abstract]
Entity Registrant Name	ADVANCED ENERGY INDUSTRIES INC
Entity Central Index Key	927,003
Document Type	10-Q
Document Period End Date	Jun. 30, 2016
Amendment Flag	false
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		39,675,972

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 209,273	$ 158,443
Marketable securities	5,784	11,986
Accounts receivable, net of allowances of $8,936 and $8,739, respectively	66,162	54,959
Inventory, Net	57,227	52,573
Deferred income tax assets	6,027	6,004
Income taxes receivable	1,875	9,040
Other current assets	8,978	7,868
Disposal Group, Including Discontinued Operation, Assets, Current	31,517	41,902
Total current assets	386,843	342,775
Property and equipment, net	11,167	9,645
OTHER ASSETS:
Deposits and other	1,678	1,729
Goodwill	43,342	42,729
Other intangible assets, net	31,408	34,141
Deferred income tax assets	30,231	30,398
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	285	1,271
Total assets	504,954	462,688
CURRENT LIABILITIES:
Accounts payable	36,951	27,246
Income taxes payable	8,611	13,972
Accrued payroll and employee benefits	8,289	9,175
Other accrued expenses	13,435	13,891
Customer deposits	6,472	3,319
Disposal Group, Including Discontinued Operation, Liabilities, Current	24,910	36,481
Total current liabilities	98,668	104,084
LONG-TERM LIABILITIES:
Deferred income tax liabilities	1,213	1,181
Uncertain tax positions	3,976	2,086
Deferred Revenue, Noncurrent	41,555	45,584
Other long-term liabilities	17,626	18,871
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	20,104	27,302
Total liabilities	183,142	199,108
STOCKHOLDERS' EQUITY:
Preferred Stock, Shares Outstanding	0	0
Common stock, $0.001 par value, 70,000 shares authorized; 39,676 and 39,756 issued and outstanding, respectively	40	40
Additional paid-in capital	200,267	195,096
Retained earnings	120,722	67,910
Accumulated other comprehensive income	783	534
Total stockholders' equity	321,812	263,580
Total liabilities and stockholders' equity	$ 504,954	$ 462,688

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets Parenthetical - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Accounts receivable, allowances	$ 8,936	$ 8,739
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	1,000	1,000
Preferred stock, shares issued (in shares)	0	0
Preferred Stock, Shares Outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	70,000,000	70,000,000
Common stock, shares issued (in shares)	39,676,000	39,756,000
Common stock, shares outstanding (in shares)	39,676,000	39,756,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Sales Revenue, Goods, Net	$ 100,752	$ 91,424	$ 187,045	$ 185,032
Sales Revenue, Services, Net	18,013	17,230	34,764	33,132
Revenue, Net	118,765	108,654	221,809	218,164
Cost of Goods Sold	47,334	43,778	88,149	86,070
Cost of Services	9,385	8,327	18,154	16,446
Total cost of sales	56,719	52,105	106,303	102,516
GROSS PROFIT	62,046	56,549	115,506	115,648
OPERATING EXPENSES:
Research and development	11,266	9,984	22,031	19,744
Selling, general and administrative	19,377	16,684	37,393	33,391
Amortization of intangible assets	1,074	1,102	2,132	2,200
Restructuring benefit	0	0	0	(2)
Total operating expenses	31,717	27,770	61,556	55,333
OPERATING INCOME	30,329	28,779	53,950	60,315
OTHER INCOME, NET	836	301	1,193	1,169
Income from continuing operations before income taxes	31,165	29,080	55,143	61,484
Provision for income taxes	3,911	6,056	7,669	12,805
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	3,277	(255,483)	5,338	(259,862)
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	27,254	23,024	47,474	48,679
NET INCOME	$ 30,531	$ (232,459)	$ 52,812	$ (211,183)
Basic weighted-average common shares outstanding	39,672	40,946	39,750	40,843
Diluted weighted-average common shares outstanding	39,969	41,253	40,046	41,192
EARNINGS PER SHARE:
Earnings Per Share, Basic	$ 0.77	$ (5.68)	$ 1.33	$ (5.17)
Earnings Per Share, Diluted	0.76	(5.68)	1.32	(5.17)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0.08	(6.24)	0.13	(6.36)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0.08	(6.24)	0.13	(6.36)
Income from Continuing Operations, Per Basic Share	0.69	0.56	1.19	1.19
Income from Continuing Operations, per diluted share	$ 0.68	$ 0.56	$ 1.19	$ 1.18

Condensed Consolidated Statemen

Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income	$ 30,531	$ (232,459)	$ 52,812	$ (211,183)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	(35)	6,547	263	(7,713)
Unrealized gains on marketable securities	(314)	(5)	(14)	(624)
Comprehensive income	$ 30,182	$ (225,917)	$ 53,061	$ (219,520)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 52,812	$ (211,183)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	5,338	(259,862)
Income from Continuing Operations Attributable to Parent	47,474	48,679
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	4,045	4,632
Stock-based compensation expense	2,998	1,180
Net gain (loss) on sale or disposal of assets	213	(18)
Changes in operating assets and liabilities:
Accounts receivable	(10,743)	11,583
Inventories	(6,632)	11,502
Other current assets	(818)	(2,246)
Accounts payable	9,616	3,554
Other current liabilities and accrued expenses	(172)	(2,985)
Income taxes	1,551	9,630
Net Cash Provided by Operating Activities, Continuing Operations	47,532	85,511
Cash Used in Operating Activities, Discontinued Operations	(4,563)	(31,717)
Net cash provided by operating activities	42,969	53,794
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(745)	(24,183)
Proceeds from sale of marketable securities	6,921	13,731
Purchase of property and equipment	(2,865)	(1,623)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	3,311	(12,075)
Cash Used in Investing Activities, Discontinued Operations	0	(32)
Net cash provided by (used in) investing activities	3,311	(12,107)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	1,621	3,056
Excess tax from stock-based compensation deduction	552	509
Other financing activities	(2)	(2)
Net Cash Provided by Financing Activities, Continuing Operations	2,171	3,563
Cash Used in Financing Activities, Discontinued Operations	(24)	(14)
Net cash provided by financing activities	2,147	3,549
Effect of Exchange Rate on Cash and Cash Equivalents	(729)	(858)
INCREASE IN CASH AND CASH EQUIVALENTS	47,698	44,378
CASH AND CASH EQUIVALENTS, beginning of period	158,443
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations	217,418	169,663
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	8,145	6,135
CASH AND CASH EQUIVALENTS, end of period	209,273	163,528
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	105	125
Cash paid for income taxes	3,818	5,098
Cash received for refunds of income taxes	315	4,843
Cash held in banks outside the United States of America	$ 140,556	$ 74,713

Discontinued Operations (Notes)

Discontinued Operations (Notes)	6 Months Ended
	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	DISCONTINUED OPERATIONS In December 2015, we completed the wind down of our inverter engineering, manufacturing and sales product line (the "inverter business"). Accordingly, the results of our inverter business has been reflected as “Income (loss) from discontinued operations, net of income taxes” on our Unaudited Condensed Consolidated Statements of Operations for all periods presented herein. The effect of our sales of extended inverter warranties to our customers continues to be reflected in deferred revenue in our Unaudited Condensed Consolidated Balance Sheets. Deferred revenue for extended inverter warranties and the associated costs of warranty service will be reflected in Sales and Cost of goods sold, respectively, from continuing operations in future periods in our Consolidated Statement of Operations, as the deferred revenue is earned and the associated services are rendered. Extended warranties related to the inverter product line are no longer offered. The items included in "Income (loss) from discontinued operations, net of income taxes" are as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Sales $ — $ 28,137 $ — $ 59,745 Cost of sales (1,716 ) 44,408 (2,423 ) 75,370 Total operating (income) expenses (including restructuring) (859 ) 197,109 (2,286 ) 207,432 Operating income (loss) from discontinued operations 2,575 (213,380 ) 4,709 (223,057 ) Other (loss) income (30 ) (147 ) 339 49 Income (loss) from discontinued operations before income taxes 2,545 (213,527 ) 5,048 (223,008 ) (Benefit) provision for income taxes (732 ) 41,956 (290 ) 36,854 Income (loss) from discontinued operations, net of income taxes $ 3,277 $ (255,483 ) $ 5,338 $ (259,862 ) Assets and Liabilities of discontinued operations within the Condensed Consolidated Balance Sheets are comprised of the following: June 30, December 31, 2016 2015 Cash and cash equivalents $ 8,145 $ 11,277 Accounts and other receivables, net 9,078 16,331 Deferred income tax assets 14,294 14,294 Current assets of discontinued operations $ 31,517 $ 41,902 Intangibles and other assets, net $ 285 $ 1,271 Non-current assets of discontinued operations $ 285 $ 1,271 Accounts payable and other accrued expenses $ 11,029 $ 19,261 Accrued warranty 13,007 11,852 Accrued restructuring 874 5,368 Current liabilities of discontinued operations $ 24,910 $ 36,481 Accrued warranty $ 19,923 $ 27,124 Other liabilities 181 178 Non-current liabilities of discontinued operations $ 20,104 $ 27,302

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2016
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The following table sets out the tax expense and the effective tax rate for our income from continuing operations: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Income from continuing operations before income taxes $ 31,165 $ 29,080 $ 55,143 $ 61,484 Provision for income taxes 3,911 6,056 7,669 12,805 Effective tax rate 12.5 % 20.8 % 13.9 % 20.8 % The effective tax rates for the six months ended June 30, 2016 and 2015 are lower than the federal statutory rate primarily due to the benefit of the earnings in foreign jurisdictions which are subject to lower tax rates. Our policy is to classify accrued interest and penalties related to unrecognized tax benefits in our income tax provision. For the three and six months ended June 30, 2016 and 2015 , the amount of interest and penalties accrued related to our unrecognized tax benefits was not significant.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Basic earnings per share ("EPS") is computed by dividing income available to common stockholders by the weighted-average number of common shares outstanding during the period. The computation of our diluted EPS is similar to the computation of our basic EPS except that the denominator is increased to include the number of additional common shares that would have been outstanding (using the if-converted and treasury stock methods), if our outstanding stock options and restricted stock units had been converted to common shares, and if such assumed conversion is dilutive. The following is a reconciliation of the weighted-average shares outstanding used in the calculation of basic and diluted EPS: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Income from continuing operations, net of income taxes $ 27,254 $ 23,024 $ 47,474 $ 48,679 Basic weighted-average common shares outstanding 39,672 40,946 39,750 40,843 Assumed exercise of dilutive stock options and restricted stock units 297 307 296 349 Diluted weighted-average common shares outstanding 39,969 41,253 40,046 41,192 Continuing operations: Basic earnings per share $ 0.69 $ 0.56 $ 1.19 $ 1.19 Diluted earnings per share $ 0.68 $ 0.56 $ 1.19 $ 1.18 The following stock options and restricted stock units were excluded in the computation of diluted earnings per share because they were anti-dilutive: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Stock options — 169 — 140 Restricted stock units 1 — 5 — Stock Buyback In September 2015 our Board of Directors authorized a program to repurchase up to $150.0 million of our stock over a thirty-month period. As of July 31, 2016, we have $100 million remaining available for the repurchase of shares. In November 2015 we entered into an accelerated stock repurchase arrangement with Morgan Stanley & Co. LLC (the “Counterparty”) pursuant to a Fixed Dollar Accelerated Share Repurchase Transaction (the “ASR Agreement”) to purchase $50.0 million of shares of our common stock in the open market. In accordance with the ASR Agreement, we paid $50.0 million at the beginning of the contact and received an initial delivery of 1.4 million shares of our common stock. In April 2016, we received a final delivery of 0.3 million shares of our common stock. A total of 1.7 million shares of our common stock was repurchased under the ASR Agreement at an average price of $28.99 per share. We retired the shares repurchased under the ASR Agreement and have therefore recognized the $50.0 million share repurchase as a reduction to Stockholders Equity.

Marketable Securities

Marketable Securities	6 Months Ended
	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	MARKETABLE SECURITIES AND ASSETS MEASURED AT FAIR VALUE Our investments with original maturities of more than three months at time of purchase and that are intended to be held for no more than 12 months, are considered marketable securities available for sale. Our marketable securities consist of commercial paper and certificates of deposit as follows: June 30, December 31, 2016 2015 Cost Fair Value Cost Fair Value Commercial paper $ — $ — $ 4,989 $ 4,995 Certificates of deposit 5,777 5,784 7,008 6,991 Total marketable securities $ 5,777 $ 5,784 $ 11,997 $ 11,986 The maturities of our marketable securities available for sale as of June 30, 2016 are as follows: Earliest Latest Certificates of deposit 7/28/2016 to 9/18/2017 The value and liquidity of the marketable securities we hold are affected by market conditions, as well as the ability of the issuers of such securities to make principal and interest payments when due, and the functioning of the markets in which these securities are traded. As of June 30, 2016 , we do not believe any of the underlying issuers of our marketable securities are at risk of default. The following tables present information about our marketable securities measured at fair value, on a recurring basis, as of June 30, 2016 and December 31, 2015 . The tables indicate the fair value hierarchy of the valuation techniques utilized to determine fair value. We did not have any financial liabilities measured at fair value, on a recurring basis, as of June 30, 2016 and December 31, 2015 . June 30, 2016 Level 1 Level 2 Level 3 Total Certificates of deposit $ — $ 5,784 $ — $ 5,784 Total marketable securities $ — $ 5,784 $ — $ 5,784 December 31, 2015 Level 1 Level 2 Level 3 Total Commercial paper $ — $ 4,995 $ — $ 4,995 Certificates of deposit — 6,991 — 6,991 Total marketable securities $ — $ 11,986 $ — $ 11,986 There were no transfers in or out of Level 1, 2, or 3 fair value measurements during the three and six months ended June 30, 2016 .

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	DERIVATIVE FINANCIAL INSTRUMENTS We are impacted by changes in foreign currency exchange rates. We attempt to mitigate these risks through the use of derivative financial instruments, primarily forward currency exchange rate contracts. During the three and six months ended June 30, 2016 and 2015 , we entered into currency exchange rate forward contracts to attempt to mitigate the exchange rate risk associated with intercompany debt denominated in nonfunctional currencies. These derivative instruments are not designated as hedges; however, they tend to offset the fluctuations of our intercompany debt due to foreign currency exchange rate changes. These forward contracts are typically for one month periods. We did not have any currency exchange rate contracts outstanding as of June 30, 2016 . At December 31, 2015 we had outstanding Euro forward contracts. During the three and six months ended June 30, 2016 and 2015 the gains and losses recorded related to the foreign currency exchange contracts are as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Foreign currency gain (loss) from foreign currency exchange contracts $ 433 $ 339 $ (569 ) $ 1,887 These gains and losses were offset by corresponding gains and losses on the revaluation of the underlying intercompany debt and both are included as a component of Other income, net, in our Unaudited Condensed Consolidated Statements of Operations.

Inventories

Inventories	6 Months Ended
	Jun. 30, 2016
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES Our inventories are valued at the lower of cost or market and computed on a first-in, first-out (FIFO) basis. Components of Inventories are as follows: June 30, December 31, 2016 2015 Parts and raw materials $ 41,459 $ 40,578 Work in process 7,073 5,643 Finished goods 8,695 6,352 Inventories $ 57,227 $ 52,573

Property and Equipment

Property and Equipment	6 Months Ended
	Jun. 30, 2016
Property, Plant and Equipment [Abstract]
PROPERTY AND EQUIPMENT	PROPERTY AND EQUIPMENT Property and equipment are as follows: June 30, December 31, 2016 2015 Buildings and land $ 1,655 $ 1,623 Machinery and equipment 31,958 30,479 Computer and communication equipment 23,608 19,744 Furniture and fixtures 1,346 1,319 Vehicles 283 215 Leasehold improvements 15,361 15,173 Construction in process 58 15 74,269 68,568 Less: Accumulated depreciation (63,102 ) (58,923 ) Property and equipment, net $ 11,167 $ 9,645 Depreciation expense, recorded in continuing operations and included in selling, general and administrative expense, is as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Depreciation expense $ 928 $ 1,189 $ 1,913 $ 2,432

Goodwill

Goodwill	6 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL	GOODWILL The following summarizes the changes in goodwill during the six months ended June 30, 2016 : June 30, 2016 Effect of Changes in Exchange Rates December 31, 2015 Goodwill $ 43,342 $ 613 $ 42,729

Intangible Assets

Intangible Assets	6 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
INTANGIBLE ASSETS	INTANGIBLE ASSETS Other intangible assets subject to amortization consisted of the following as of June 30, 2016 and December 31, 2015 : June 30, 2016 Gross Carrying Amount Effect of Changes in Exchange Rates Accumulated Amortization Net Carrying Amount Weighted-Average Useful Life in Years Technology-based $ 14,130 $ (1,670 ) $ (3,466 ) $ 8,994 10 Customer relationships 31,276 (3,155 ) (6,874 ) 21,247 12 Trademarks and other 2,892 (356 ) (1,369 ) 1,167 10 Total amortizable intangibles $ 48,298 $ (5,181 ) $ (11,709 ) $ 31,408 December 31, 2015 Gross Carrying Amount Effect of Changes in Exchange Rates Accumulated Amortization Net Carrying Amount Weighted-Average Useful Life in Years Technology-based $ 14,130 $ (1,535 ) $ (2,828 ) $ 9,767 10 Customer relationships 31,276 (2,805 ) (5,550 ) 22,921 12 Trademarks and other 2,892 (247 ) (1,192 ) 1,453 10 Total amortizable intangibles $ 48,298 $ (4,587 ) $ (9,570 ) $ 34,141 Amortization expense relating to other intangible assets included in our income from continuing operations is as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Amortization expense $ 1,074 $ 1,102 $ 2,132 $ 2,200 Amortization expense related to intangibles for each of the five years 2016 (remaining) through 2020 and thereafter is as follows: Year Ending December 31, 2016 (remaining) $ 2,074 2017 3,956 2018 3,943 2019 3,926 2020 3,283 Thereafter 14,226 $ 31,408

Warranties

Warranties	6 Months Ended
	Jun. 30, 2016
Product Warranties Disclosures [Abstract]
WARRANTIES	WARRANTIES Provisions of our sales agreements include customary product warranties, ranging from 12 months to 24 months following installation. The estimated cost of warranties is recorded when revenue is recognized and is based upon historical experience by product, configuration and geographic region. We establish accruals for our warranty obligations that are probable to result in future costs. The warranty accrual is included in our Other accrued expenses in our balance sheet. Changes in our product warranty accrual is as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Balances at beginning of period $ 1,750 $ 1,556 $ 1,633 $ 1,612 Increases to accruals related to sales during the period 541 255 937 439 Warranty expenditures (335 ) (346 ) (614 ) (576 ) Effect of changes in currency exchange rates (23 ) 11 (23 ) 1 Balances at end of period $ 1,933 $ 1,476 $ 1,933 $ 1,476

Pension Liability (Notes)

Pension Liability (Notes)	6 Months Ended
	Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Pension and Other Postretirement Benefits Disclosure [Text Block]	PENSION LIABILITY In connection with the HiTek acquisition on April 12, 2014, we acquired the HiTek Power Limited Pension Scheme ("HPLPS"). The HPLPS has been closed to new participants and additional accruals since 2006. In order to measure the expense and related benefit obligation, various assumptions are made including discount rates used to value the obligation, expected return on plan assets used to fund these expenses and estimated future inflation rates. These assumptions are based on historical experience as well as current facts and circumstances. An actuarial analysis is used to measure the expense and liability associated with pension benefits. We have committed to fund our defined benefit obligation of HPLPS approximately $1.0 million per year through 2024. The net pension liability is included in Other long-term liabilities in our balance sheet as follows: June 30, December 31, 2016 2015 Pension liability $ 16,342 $ 17,789 The components of the net periodic pension expense for the three and six months ended June 30, 2016 and 2015 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Net periodic (benefit) expense: Expected return on plan assets $ (132 ) $ (165 ) $ (264 ) $ (328 ) Interest cost 256 329 512 654 Amortization of actuarial gains and losses 88 — 175 — Net periodic expense $ 212 $ 164 $ 423 $ 326

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION We have reserved a total of 2.8 million shares of Advanced Energy’s common stock for issuance under the 2008 Omnibus Incentive Plan. The Plan provides for the grant of stock options, stock appreciation rights, restricted stock, stock units (including deferred stock units), unrestricted stock, and dividend equivalent rights. Any of the awards issued under this Plan may be issued as performance based to align compensation awards to the attainment of annual or long-term performance goals. As of June 30, 2106, there were 1.9 million shares available for grant under the 2008 Omnibus Incentive Plan. Stock option awards are granted with an exercise price equal to the market price of our stock at the date of grant and have either a time based vesting schedule of three or four-years, or a performance based vesting schedule based upon achievement of organizational performance goals over a three year period, and a term of 10 years. The fair value of each award was estimated on the date of grant using the Black-Scholes-Merton option pricing model. Restricted stock units (“RSU’s”) are granted with either a time based vesting schedule of three or four-years, or a performance based vesting schedule based upon achievement of organizational performance goals over a three year period. The fair value of each RSU is determined based upon the closing fair market value of our common stock on the grant date. We recognize stock-based compensation expense based on the fair value of the awards issued and the functional area of the employee receiving the award. Stock-based compensation for the three and six months ended June 30, 2016 and 2015 is as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Stock-based compensation expense $ 1,569 $ 693 $ 2,998 $ 1,180 A summary of activity for stock option awards during the three and six months ended June 30, 2016 is as follows: Three Months Ended June 30, 2016 Six Months Ended June 30, 2016 Number of Options Weighted-Average Exercise Price per Share Number of Options Weighted-Average Exercise Price per Share Options outstanding at beginning of period 537 $ 17.54 642 $ 17.10 Options granted — — — — Options exercised (30 ) 17.85 (135 ) 15.55 Options forfeited (12 ) 26.32 (12 ) 26.32 Options outstanding at end of period 495 $ 17.30 495 $ 17.30 The assumptions in the following table were used to determine fair value of options granted using the Black-Scholes-Merton option valuation model. Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Expected term (years) n/a 4.3 years n/a 4.3 years Estimated volatility n/a 42.0% n/a 43.0% Estimated dividend yield n/a —% n/a —% Risk-free interest rate n/a 1.4% n/a 1.1% - 1.4% The expected term represents the period of time the stock options awarded are expected to be outstanding, based upon the historical experience of the plan participants. Expected volatility is based on the historical volatility using daily stock price observations. The estimated dividend yield is based on historical dividend practice and the market value of our common stock. The risk-free rate is based on the U.S. treasury yield curve, for periods within the contractual life of the stock option at the time of award. A summary of activity for RSU awards for the three and six months ended June 30, 2016 is as follows: Three Months Ended June 30, 2016 Six Months Ended June 30, 2016 Number of Options Average Weighted Grant Date Fair Value Number of Options Average Weighted Grant Date Fair Value Balance at beginning of period 393 $ 27.49 233 $ 26.10 RSUs granted 57 34.77 287 29.76 RSUs vested (80 ) 25.93 (150 ) 26.07 RSUs forfeited (17 ) 28.21 (17 ) 28.21 Balance at end of period 353 $ 28.98 353 $ 28.98

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES We have firm purchase commitments and agreements with various suppliers to ensure the availability of components. The obligation as of June 30, 2016 is approximately $51.3 million . Our policy with respect to all purchase commitments is to record losses, if any, when they are probable and reasonably estimable. We continuously monitor these commitments for exposure to potential losses and will record a provision for losses when it is deemed necessary. We are involved in disputes and legal actions arising in the normal course of our business. There have been no material developments in legal proceedings in which we are involved during the three and six months ended June 30, 2016 .

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2016
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONS Members of our Board of Directors hold various executive positions and serve as directors at other companies, including companies that are our customers. Sales to our related party customers for the three and six months ended June 30, 2016 and 2015 are as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Sales to related parties $ 109 $ 112 $ 223 $ 311 Number of related party customers 3 1 3 2 Our accounts receivable balance from related party customers with outstanding balances as of June 30, 2016 and December 31, 2015 is as follows: June 30, December 31, 2016 2015 Accounts receivable from related parties $9 $83 Number of related party customers 2 1

Geographic and Customer Informa

Geographic and Customer Information Geographic and Customer Information (Notes)	6 Months Ended
	Jun. 30, 2016
Segment Reporting Information [Line Items]
Segment Reporting Disclosure [Text Block]	SIGNIFICANT CUSTOMER INFORMATION The following tables summarize sales, and percentages of sales, by customers which individually accounted for 10% or more of sales for the three and six months ended June 30, 2016 and 2015 : Three Months Ended June 30, 2016 % of Total Sales 2015 % of Total Sales Applied Materials, Inc. $ 39,032 32.9 % $ 28,719 26.4 % LAM Research 27,237 22.9 % 24,535 22.6 % Six Months Ended June 30, 2016 % of Total Sales 2015 % of Total Sales Applied Materials, Inc. $ 72,804 32.8 % $ 63,764 29.2 % LAM Research 49,203 22.2 % 44,961 20.6 % The following table summarize the accounts receivable balances, and percentages of the total accounts receivables, for customers which individually accounted for 10% or more of accounts receivables as of June 30, 2016 and December 31, 2015 : June 30, December 31, 2016 2015 Applied Materials, Inc. $ 24,580 37.2 % $ 17,147 31.2 % LAM Research 16,522 25.0 % 7,321 13.3 % Our sales to Applied Materials, Inc. and LAM Research include precision power products used in semiconductor processing and solar and flat panel display. No other customer accounted for 10% or more of our sales or accounts receivable balances during these periods.

Credit Facility (Notes)

Credit Facility (Notes)	6 Months Ended
	Jun. 30, 2016
Line of Credit Facility [Line Items]
Debt Disclosure [Text Block]	CREDIT FACILITIES In October 2012, we, along with two of our wholly-owned subsidiaries, AE Solar Energy, Inc. and Sekidenko, Inc., entered into a Credit Agreement, subsequently amended in November 2012 and August 2013, (the "Credit Agreement") with Wells Fargo Bank, National Association ("Wells Fargo"), as agent for and on behalf of certain lenders (each a "Lender"), which provides for a secured revolving credit facility of up to $50.0 million (the "Credit Facility"), subject to a borrowing base calculation as discussed in our Annual Report on Form 10-K for the year ended December 31, 2015 . The maturity date of the Credit Facility is October 12, 2017 . As of June 30, 2016 , we had $15.5 million of availability on our Wells Fargo Credit Facility. As of June 30, 2016 , the rate in effect was 4.25% . The Credit Agreement requires us to pay certain fees to the Lenders. During the six months ended June 30, 2016 and 2015 , we expensed $0.2 million and $0.2 million , respectively, in interest and fees related to unused line of credit fees and amortization of debt issuance costs. We did not borrow against the Credit Facility during the six months ended June 30, 2016 .

Commitments and Contingencies C

Commitments and Contingencies Commitments and Contingencies (Policies)	6 Months Ended
	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Our policy with respect to all purchase commitments is to record losses, if any, when they are probable and reasonably estimable.

Discontinued Operations (Tables

Discontinued Operations (Tables)	6 Months Ended
	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Groups, Including Discontinued Operations [Table Text Block]	The items included in "Income (loss) from discontinued operations, net of income taxes" are as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Sales $ — $ 28,137 $ — $ 59,745 Cost of sales (1,716 ) 44,408 (2,423 ) 75,370 Total operating (income) expenses (including restructuring) (859 ) 197,109 (2,286 ) 207,432 Operating income (loss) from discontinued operations 2,575 (213,380 ) 4,709 (223,057 ) Other (loss) income (30 ) (147 ) 339 49 Income (loss) from discontinued operations before income taxes 2,545 (213,527 ) 5,048 (223,008 ) (Benefit) provision for income taxes (732 ) 41,956 (290 ) 36,854 Income (loss) from discontinued operations, net of income taxes $ 3,277 $ (255,483 ) $ 5,338 $ (259,862 ) Assets and Liabilities of discontinued operations within the Condensed Consolidated Balance Sheets are comprised of the following: June 30, December 31, 2016 2015 Cash and cash equivalents $ 8,145 $ 11,277 Accounts and other receivables, net 9,078 16,331 Deferred income tax assets 14,294 14,294 Current assets of discontinued operations $ 31,517 $ 41,902 Intangibles and other assets, net $ 285 $ 1,271 Non-current assets of discontinued operations $ 285 $ 1,271 Accounts payable and other accrued expenses $ 11,029 $ 19,261 Accrued warranty 13,007 11,852 Accrued restructuring 874 5,368 Current liabilities of discontinued operations $ 24,910 $ 36,481 Accrued warranty $ 19,923 $ 27,124 Other liabilities 181 178 Non-current liabilities of discontinued operations $ 20,104 $ 27,302

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Schedule of tax expense and the effective tax rate for our income from continuing operations	The following table sets out the tax expense and the effective tax rate for our income from continuing operations: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Income from continuing operations before income taxes $ 31,165 $ 29,080 $ 55,143 $ 61,484 Provision for income taxes 3,911 6,056 7,669 12,805 Effective tax rate 12.5 % 20.8 % 13.9 % 20.8 %

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Reconciliation of the weighted-average shares outstanding used in the calculation of basic and diluted EPS	The following is a reconciliation of the weighted-average shares outstanding used in the calculation of basic and diluted EPS: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Income from continuing operations, net of income taxes $ 27,254 $ 23,024 $ 47,474 $ 48,679 Basic weighted-average common shares outstanding 39,672 40,946 39,750 40,843 Assumed exercise of dilutive stock options and restricted stock units 297 307 296 349 Diluted weighted-average common shares outstanding 39,969 41,253 40,046 41,192 Continuing operations: Basic earnings per share $ 0.69 $ 0.56 $ 1.19 $ 1.19 Diluted earnings per share $ 0.68 $ 0.56 $ 1.19 $ 1.18
Schedule of stock options and restricted units were excluded in the computation of diluted earnings per share because they were anti-dilutive	The following stock options and restricted stock units were excluded in the computation of diluted earnings per share because they were anti-dilutive: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Stock options — 169 — 140 Restricted stock units 1 — 5 —

Marketable Securities (Tables)

Marketable Securities (Tables)	6 Months Ended
	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
The composition of our marketable securities	Our marketable securities consist of commercial paper and certificates of deposit as follows: June 30, December 31, 2016 2015 Cost Fair Value Cost Fair Value Commercial paper $ — $ — $ 4,989 $ 4,995 Certificates of deposit 5,777 5,784 7,008 6,991 Total marketable securities $ 5,777 $ 5,784 $ 11,997 $ 11,986
The maturities of our marketable securities available for sale	The maturities of our marketable securities available for sale as of June 30, 2016 are as follows: Earliest Latest Certificates of deposit 7/28/2016 to 9/18/2017

Derivative Financial Instrume28

Derivative Financial Instruments Gains and Losses related to Foreign Currency Contracts (Tables)	6 Months Ended
	Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) [Table Text Block]	During the three and six months ended June 30, 2016 and 2015 the gains and losses recorded related to the foreign currency exchange contracts are as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Foreign currency gain (loss) from foreign currency exchange contracts $ 433 $ 339 $ (569 ) $ 1,887

Assets and Liabilities Measured

Assets and Liabilities Measured at Fair Value (Tables)	6 Months Ended
	Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of financial assets measured at fair value, on a recurring basis	The following tables present information about our marketable securities measured at fair value, on a recurring basis, as of June 30, 2016 and December 31, 2015 . The tables indicate the fair value hierarchy of the valuation techniques utilized to determine fair value. We did not have any financial liabilities measured at fair value, on a recurring basis, as of June 30, 2016 and December 31, 2015 . June 30, 2016 Level 1 Level 2 Level 3 Total Certificates of deposit $ — $ 5,784 $ — $ 5,784 Total marketable securities $ — $ 5,784 $ — $ 5,784 December 31, 2015 Level 1 Level 2 Level 3 Total Commercial paper $ — $ 4,995 $ — $ 4,995 Certificates of deposit — 6,991 — 6,991 Total marketable securities $ — $ 11,986 $ — $ 11,986

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2016
Inventory Disclosure [Abstract]
Components of inventories	Our inventories are valued at the lower of cost or market and computed on a first-in, first-out (FIFO) basis. Components of Inventories are as follows: June 30, December 31, 2016 2015 Parts and raw materials $ 41,459 $ 40,578 Work in process 7,073 5,643 Finished goods 8,695 6,352 Inventories $ 57,227 $ 52,573

Property and Equipment (Tables)

Property and Equipment (Tables)	6 Months Ended
	Jun. 30, 2016
Property, Plant and Equipment [Abstract]
Details of property and equipment	Property and equipment are as follows: June 30, December 31, 2016 2015 Buildings and land $ 1,655 $ 1,623 Machinery and equipment 31,958 30,479 Computer and communication equipment 23,608 19,744 Furniture and fixtures 1,346 1,319 Vehicles 283 215 Leasehold improvements 15,361 15,173 Construction in process 58 15 74,269 68,568 Less: Accumulated depreciation (63,102 ) (58,923 ) Property and equipment, net $ 11,167 $ 9,645
Depreciation expense recorded in continuing operations	Depreciation expense, recorded in continuing operations and included in selling, general and administrative expense, is as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Depreciation expense $ 928 $ 1,189 $ 1,913 $ 2,432

Goodwill (Tables)

Goodwill (Tables)	6 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of the changes in goodwill	The following summarizes the changes in goodwill during the six months ended June 30, 2016 : June 30, 2016 Effect of Changes in Exchange Rates December 31, 2015 Goodwill $ 43,342 $ 613 $ 42,729

Intangible Assets (Tables)

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of other intangible assets	Other intangible assets subject to amortization consisted of the following as of June 30, 2016 and December 31, 2015 : June 30, 2016 Gross Carrying Amount Effect of Changes in Exchange Rates Accumulated Amortization Net Carrying Amount Weighted-Average Useful Life in Years Technology-based $ 14,130 $ (1,670 ) $ (3,466 ) $ 8,994 10 Customer relationships 31,276 (3,155 ) (6,874 ) 21,247 12 Trademarks and other 2,892 (356 ) (1,369 ) 1,167 10 Total amortizable intangibles $ 48,298 $ (5,181 ) $ (11,709 ) $ 31,408 December 31, 2015 Gross Carrying Amount Effect of Changes in Exchange Rates Accumulated Amortization Net Carrying Amount Weighted-Average Useful Life in Years Technology-based $ 14,130 $ (1,535 ) $ (2,828 ) $ 9,767 10 Customer relationships 31,276 (2,805 ) (5,550 ) 22,921 12 Trademarks and other 2,892 (247 ) (1,192 ) 1,453 10 Total amortizable intangibles $ 48,298 $ (4,587 ) $ (9,570 ) $ 34,141
Schedule of amortization expense relating to other intangible assets	Amortization expense relating to other intangible assets included in our income from continuing operations is as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Amortization expense $ 1,074 $ 1,102 $ 2,132 $ 2,200
Schedule of expected future amortization expense	Amortization expense related to intangibles for each of the five years 2016 (remaining) through 2020 and thereafter is as follows: Year Ending December 31, 2016 (remaining) $ 2,074 2017 3,956 2018 3,943 2019 3,926 2020 3,283 Thereafter 14,226 $ 31,408

Warranties (Tables)

Warranties (Tables)	6 Months Ended
	Jun. 30, 2016
Product Warranties Disclosures [Abstract]
Changes in accrued product warranties	Changes in our product warranty accrual is as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Balances at beginning of period $ 1,750 $ 1,556 $ 1,633 $ 1,612 Increases to accruals related to sales during the period 541 255 937 439 Warranty expenditures (335 ) (346 ) (614 ) (576 ) Effect of changes in currency exchange rates (23 ) 11 (23 ) 1 Balances at end of period $ 1,933 $ 1,476 $ 1,933 $ 1,476

Pension Liability (Tables)

Pension Liability (Tables)	6 Months Ended
	Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Schedule of Net Funded Status [Table Text Block]	The net pension liability is included in Other long-term liabilities in our balance sheet as follows: June 30, December 31, 2016 2015 Pension liability $ 16,342 $ 17,789
Schedule of Net Benefit Costs [Table Text Block]	The components of the net periodic pension expense for the three and six months ended June 30, 2016 and 2015 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Net periodic (benefit) expense: Expected return on plan assets $ (132 ) $ (165 ) $ (264 ) $ (328 ) Interest cost 256 329 512 654 Amortization of actuarial gains and losses 88 — 175 — Net periodic expense $ 212 $ 164 $ 423 $ 326

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of stock-based compensation	Stock-based compensation for the three and six months ended June 30, 2016 and 2015 is as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Stock-based compensation expense $ 1,569 $ 693 $ 2,998 $ 1,180
Summary of stock option activity	A summary of activity for stock option awards during the three and six months ended June 30, 2016 is as follows: Three Months Ended June 30, 2016 Six Months Ended June 30, 2016 Number of Options Weighted-Average Exercise Price per Share Number of Options Weighted-Average Exercise Price per Share Options outstanding at beginning of period 537 $ 17.54 642 $ 17.10 Options granted — — — — Options exercised (30 ) 17.85 (135 ) 15.55 Options forfeited (12 ) 26.32 (12 ) 26.32 Options outstanding at end of period 495 $ 17.30 495 $ 17.30
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	The assumptions in the following table were used to determine fair value of options granted using the Black-Scholes-Merton option valuation model. Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Expected term (years) n/a 4.3 years n/a 4.3 years Estimated volatility n/a 42.0% n/a 43.0% Estimated dividend yield n/a —% n/a —% Risk-free interest rate n/a 1.4% n/a 1.1% - 1.4%
Summary of non-vested Restricted Stock Units activity	A summary of activity for RSU awards for the three and six months ended June 30, 2016 is as follows: Three Months Ended June 30, 2016 Six Months Ended June 30, 2016 Number of Options Average Weighted Grant Date Fair Value Number of Options Average Weighted Grant Date Fair Value Balance at beginning of period 393 $ 27.49 233 $ 26.10 RSUs granted 57 34.77 287 29.76 RSUs vested (80 ) 25.93 (150 ) 26.07 RSUs forfeited (17 ) 28.21 (17 ) 28.21 Balance at end of period 353 $ 28.98 353 $ 28.98

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2016
Related Party Transaction [Line Items]
Schedule of related party transactions	Members of our Board of Directors hold various executive positions and serve as directors at other companies, including companies that are our customers. Sales to our related party customers for the three and six months ended June 30, 2016 and 2015 are as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Sales to related parties $ 109 $ 112 $ 223 $ 311 Number of related party customers 3 1 3 2 Our accounts receivable balance from related party customers with outstanding balances as of June 30, 2016 and December 31, 2015 is as follows: June 30, December 31, 2016 2015 Accounts receivable from related parties $9 $83 Number of related party customers 2 1

Geographic and Customer Infor38

Geographic and Customer Information (Tables)	6 Months Ended
	Jun. 30, 2016
Significant Customer Information [Abstract]
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]	The following tables summarize sales, and percentages of sales, by customers which individually accounted for 10% or more of sales for the three and six months ended June 30, 2016 and 2015 : Three Months Ended June 30, 2016 % of Total Sales 2015 % of Total Sales Applied Materials, Inc. $ 39,032 32.9 % $ 28,719 26.4 % LAM Research 27,237 22.9 % 24,535 22.6 % Six Months Ended June 30, 2016 % of Total Sales 2015 % of Total Sales Applied Materials, Inc. $ 72,804 32.8 % $ 63,764 29.2 % LAM Research 49,203 22.2 % 44,961 20.6 % The following table summarize the accounts receivable balances, and percentages of the total accounts receivables, for customers which individually accounted for 10% or more of accounts receivables as of June 30, 2016 and December 31, 2015 : June 30, December 31, 2016 2015 Applied Materials, Inc. $ 24,580 37.2 % $ 17,147 31.2 % LAM Research 16,522 25.0 % 7,321 13.3 %

Basis of Presentation FASB Guid

Basis of Presentation FASB Guidance on Presentation of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
FASB Guidance on Presentation of Deferred Tax Assets and Liabilities [Abstract]
Result of FASB Deferred Tax Guidance Reclass from Current to Non-Current Assets	$ 20.3	$ 20.3
Result of FASB Deferred Tax Guidance Reclass from Current to Non-Current Assets, Discontinued Operations	$ 14.3	$ 14.3

Discontinued Operations Stateme

Discontinued Operations Statement of Operations for Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	$ 0	$ 28,137	$ 0	$ 59,745
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	(1,716)	44,408	(2,423)	75,370
Disposal Group, Including Discontinued Operation, Operating Expense	(859)	197,109	(2,286)	207,432
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	2,575	(213,380)	4,709	(223,057)
Disposal Group, Including Discontinued Operation, Other Expense	(30)	147	339	49
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	2,545	(213,527)	5,048	(223,008)
Discontinued Operation, Tax Effect of Discontinued Operation	(732)	41,956	(290)	36,854
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 3,277	$ (255,483)	$ 5,338	$ (259,862)

Discontinued Operations Assets

Discontinued Operations Assets and Liabilities of Discontinued Operations (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	$ 8,145	$ 11,277	$ 6,135
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	9,078	16,331
Disposal Group, Including Discontinued Operation, Deferred Tax Assets	14,294	14,294
Disposal Group, Including Discontinued Operation, Assets, Current	31,517	41,902
Disposal Group, Including Discontinued Operation, Intangible Assets, Noncurrent	285	1,271
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	285	1,271
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities	11,029	19,261
Disposal Groups_Including Discontinued Operations_Accrued Warranty Current	13,007	11,852
Disposal Groups_Including Discontinued Operations_Accrued Restructuring	874	5,368
Disposal Group, Including Discontinued Operation, Liabilities, Current	24,910	36,481
Disposal Groups_Including Discontinued Operations_Accrued Warranty NonCurrent	19,923	27,124
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent	181	178
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	$ 20,104	$ 27,302

Income Taxes Schedule of tax ex

Income Taxes Schedule of tax expense and the effective tax rate for our income from continuing operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income (loss) from continuing operations before income taxes	$ 31,165	$ 29,080	$ 55,143	$ 61,484
Provision for income taxes	$ 3,911	$ 6,056	$ 7,669	$ 12,805
Effective tax rate	12.50%	20.80%	13.90%	20.80%

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		5 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Apr. 11, 2016	Nov. 06, 2015	Sep. 16, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock Repurchase Program, Authorized Amount				$ 50	$ 150
Stock Repurchased and Retired During Period, Shares	0.3	1.4	1.7

Earnings Per Share Reconciliati

Earnings Per Share Reconciliation of the weighted-average shares outstanding used in the calculation of basic and diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net Income Attributable to Parent	$ 30,531	$ (232,459)	$ 52,812	$ (211,183)
Basic weighted-average common shares outstanding	39,672	40,946	39,750	40,843
Assumed exercise of dilutive stock options and restricted stock units	297	307	296	349
Diluted weighted-average common shares outstanding	39,969	41,253	40,046	41,192
Income from Continuing Operations:
Income from Continuing Operations, Per Basic Share	$ 0.69	$ 0.56	$ 1.19	$ 1.19
Income from Continuing Operations, per diluted share	$ 0.68	$ 0.56	$ 1.19	$ 1.18

Earnings Per Share Schedule of

Earnings Per Share Schedule of stock options and restricted units were excluded in the computation of diluted earnings per share because they were anti-dilutive (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and restricted units excluded from the computation of diluted earnings per share because they were anti-dilutive	0	169	0	140
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and restricted units excluded from the computation of diluted earnings per share because they were anti-dilutive	1	0	5	0

Earnings Per Share Stock Buybac

Earnings Per Share Stock Buyback (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		5 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Apr. 11, 2016	Nov. 06, 2015	Sep. 16, 2015
Earnings Per Share [Abstract]
Stock Repurchased and Retired During Period, Shares	0.3	1.4	1.7
accelerated share repurchases, average price paid per share	$ 28.99
Stock Repurchase Program, Authorized Amount				$ 50	$ 150

Marketable Securities (Details)

Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	$ 5,784	$ 11,986
Available-for-sale Debt Securities, Amortized Cost Basis	5,777	11,997
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	5,784	6,991
Available-for-sale Debt Securities, Amortized Cost Basis	$ 5,777	$ 7,008

Marketable Securities The matur

Marketable Securities The maturities of our marketable securities available for sale (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	$ 5,784	$ 11,986
Available-for-sale Debt Securities, Amortized Cost Basis	5,777	11,997
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	0	4,995
Available-for-sale Debt Securities, Amortized Cost Basis	0	4,989
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	5,784	6,991
Available-for-sale Debt Securities, Amortized Cost Basis	$ 5,777	$ 7,008
Certificates of Deposit [Member] | Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Maturities of marketable securites, by date	Jul. 28, 2016
Certificates of Deposit [Member] | Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Maturities of marketable securites, by date	Sep. 18, 2017

Derivative Financial Instrume49

Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Foreign Exchange [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 433	$ 339	$ (569)	$ 1,887

Assets and Liabilities Measur50

Assets and Liabilities Measured at Fair Value Schedule of financial assets measured at fair value, on a recurring basis (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of recurring assets	$ 5,784	$ 11,986
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of recurring assets	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of recurring assets	5,784	11,986
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of recurring assets	0	0
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of recurring assets		4,995
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of recurring assets		0
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of recurring assets		4,995
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of recurring assets		0
Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of recurring assets	5,784	6,991
Certificates of Deposit [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of recurring assets	0	0
Certificates of Deposit [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of recurring assets	5,784	6,991
Certificates of Deposit [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of recurring assets	$ 0	$ 0

Inventories Components of inven

Inventories Components of inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Parts and raw materials	$ 41,459	$ 40,578
Work in process	7,073	5,643
Finished goods	8,695	6,352
Inventory, Net	$ 57,227	$ 52,573

Property and Equipment Details

Property and Equipment Details of property and equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 74,269	$ 68,568
Less: Accumulated depreciation	(63,102)	(58,923)
Property and equipment, net	11,167	9,645
Buildings and Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,655	1,623
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	31,958	30,479
Computer and Communication Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	23,608	19,744
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,346	1,319
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	283	215
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,361	15,173
Construction in Process [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 58	$ 15

Property and Equipment Deprecia

Property and Equipment Depreciation expense recorded in continuing operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 928	$ 1,189	$ 1,913	$ 2,432

Goodwill Schedule of the change

Goodwill Schedule of the changes in goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill	$ 43,342	$ 42,729
Goodwill, Translation Adjustments	$ 613

Intangible Assets Schedule of o

Intangible Assets Schedule of other intangible assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 48,298	$ 48,298
Finite-Lived Intangible Assets, Translation Adjustments	(5,181)	(4,587)
Finite-Lived Intangible Assets, Accumulated Amortization	(11,709)	(9,570)
Finite-lived intangible assets, net	31,408
Intangible Assets, Net (Excluding Goodwill)	31,408	34,141
Technology-based [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	14,130	14,130
Finite-Lived Intangible Assets, Translation Adjustments	(1,670)	(1,535)
Finite-Lived Intangible Assets, Accumulated Amortization	(3,466)	(2,828)
Finite-lived intangible assets, net	$ 8,994	$ 9,767
Finite-Lived Intangible Asset, Useful Life	10 years	10 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 31,276	$ 31,276
Finite-Lived Intangible Assets, Translation Adjustments	(3,155)	(2,805)
Finite-Lived Intangible Assets, Accumulated Amortization	(6,874)	(5,550)
Finite-lived intangible assets, net	$ 21,247	$ 22,921
Finite-Lived Intangible Asset, Useful Life	12 years	12 years
Trademarks and other [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 2,892	$ 2,892
Finite-Lived Intangible Assets, Translation Adjustments	(356)	(247)
Finite-Lived Intangible Assets, Accumulated Amortization	(1,369)	(1,192)
Finite-lived intangible assets, net	$ 1,167	$ 1,453
Finite-Lived Intangible Asset, Useful Life	10 years	10 years

Intangible Assets Schedule of a

Intangible Assets Schedule of amortization expense relating to other intangible assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 48,298		$ 48,298		$ 48,298
Finite-Lived Intangible Assets, Translation Adjustments			(5,181)		(4,587)
Finite-Lived Intangible Assets, Accumulated Amortization	(11,709)		(11,709)		(9,570)
Finite-lived intangible assets, net	31,408		31,408
Amortization expense	1,074	$ 1,102	2,132	$ 2,200
Technology Equipment [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	14,130		14,130		14,130
Finite-Lived Intangible Assets, Translation Adjustments			(1,670)		(1,535)
Finite-Lived Intangible Assets, Accumulated Amortization	(3,466)		(3,466)		(2,828)
Finite-lived intangible assets, net	$ 8,994		$ 8,994		$ 9,767
Finite-Lived Intangible Asset, Useful Life			10 years		10 years

Intangible Assets Schedule of F

Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) $ in Thousands	Jun. 30, 2016USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2016 (remaining)	$ 2,074
2,017	3,956
2,018	3,943
2,019	3,926
2,020	3,283
Thereafter	14,226
Finite-lived intangible assets, net	$ 31,408

Warranties Narrative (Details)

Warranties Narrative (Details)	3 Months Ended
	Mar. 31, 2016
Minimum [Member]
Product Liability Contingency [Line Items]
Standard Product Warranty Term	12 months
Maximum [Member]
Product Liability Contingency [Line Items]
Standard Product Warranty Term	24 months

Warranties Changes in accrued p

Warranties Changes in accrued product warranties (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]
Balances at beginning of period	$ 1,750	$ 1,556	$ 1,633	$ 1,612
Increases to accruals related to sales during the period	541	255	937	439
Product Warranty Expense	335	346	$ 614	576
Basis of Presentation			BASIS OF PRESENTATION Advanced Energy Industries, Inc., a Delaware corporation, and its wholly-owned subsidiaries ("we," "us," "our," "Advanced Energy," or the "Company") design, manufacture, sell, and support power conversion products that transform power into various usable forms. Our products enable manufacturing processes that use thin film for various products, such as semiconductor devices, flat panel displays, thin film renewables, architectural glass, optical coating and consumer products decorative and functional coating. We also supply thermal instrumentation products for advanced temperature control in the thin film process for these same markets. Our power control modules provide power control solutions for industrial applications where heat treatment and processing are used such as glass manufacturing, metal fabrication and treatment, and material and chemical processing. Our high voltage power supplies and modules are used in applications such as semiconductor ion implantation, scanning electron microscopy, chemical analysis such as mass spectrometry and various applications using X-ray technology and electron guns for both analytical and processing applications. Our network of global service support centers provides a recurring revenue opportunity as we offer repair services, conversions, upgrades, and refurbishments and sales of used equipment to companies using our products. As of December 31, 2015, we discontinued the production, engineering, and sales of our Inverter product line. As such, all Inverter revenues, costs, assets and liabilities are reported in Discontinued Operations for all periods presented herein. See Note 2. Discontinued Operations. In the opinion of management, the accompanying Unaudited Condensed Consolidated Financial Statements contain all adjustments, consisting of normal, recurring adjustments, necessary to present fairly the financial position of the Company as of June 30, 2016 , and the results of our operations and cash flows for the three and six months ended June 30, 2016 and 2015 . The Unaudited Condensed Consolidated Financial Statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") have been condensed or omitted pursuant to such rules and regulations. These Unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto contained in our Annual Report on Form 10-K for the fiscal year ended December 31, 2015 and other financial information filed with the SEC. ESTIMATES AND ASSUMPTIONS The preparation of our Unaudited Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires us to make estimates, assumptions and judgments that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. We believe that the significant estimates, assumptions, and judgments when accounting for items and matters such as allowances for doubtful accounts, excess and obsolete inventory, warranty reserves, acquisitions, asset valuations, goodwill, asset life, depreciation, amortization, recoverability of assets, impairments, deferred revenue, stock option and restricted stock grants, taxes, and other provisions are reasonable, based upon information available at the time they are made. Actual results may differ from these estimates. CRITICAL ACCOUNTING POLICIES Our accounting policies are described in our audited Consolidated Financial Statements and Notes contained in our Annual Report on Form 10-K for the year ended December 31, 2015 . NEW ACCOUNTING STANDARDS From time to time, the Financial Accounting Standards Board ("FASB") or other standards setting bodies issue new accounting pronouncements. Updates to the FASB Accounting Standards Codification (“ASC”) are communicated through issuance of an Accounting Standards Update (“ASU”). Unless otherwise discussed, we believe that the impact of recently issued guidance, whether adopted or to be adopted in the future, is not expected to have a material impact on the Consolidated Financial Statements upon adoption. In May 2014, the FASB issued guidance on revenue from contracts with customers, which implements a five step process for how an entity should recognize revenue in order to depict the transfer of promised 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. This guidance will be effective for us in the first quarter of 2018. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. We are currently evaluating the impact that the adoption will have on our Consolidated Financial Statements and related disclosures. We have not yet selected a transition method nor have we determined the effect of the standard on our ongoing reporting. In November 2015, the FASB issued guidance requiring entities to present deferred tax assets and liabilities as noncurrent in a classified balance sheet instead of separating into current and noncurrent amounts. This guidance is effective for the first quarter of 2017. Early adoption is permitted for all companies in any interim or annual period. We are not planning on early adoption. Based on our current assessment, we have determined that as of June 30, 2016 and June 30, 2015 , the result of adoption would be the reclass of approximately $20.3 million and $20.3 million , respectively, from current assets to non-current assets. Of these amounts, $14.3 million and $14.3 million , respectively, would have been reflected in discontinued operations. In February 2016, the FASB issued guidance which requires organizations that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. The new guidance also requires additional disclosures related to leasing transactions. The standard is effective for the first quarter of 2019. We are currently evaluating the impact that the adoption will have on our Consolidated Financial Statements and related disclosures.
Product Warranty Accrual, Foreign Exchange Impact	(23)	11	$ (23)	1
Balances at end of period	$ 1,933	$ 1,476	$ 1,933	$ 1,476

Pension Liability (Details)

Pension Liability (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded Status of Plan	$ (16,342)		$ (16,342)		$ (17,789)
Defined Benefit Plan, Interest Cost	256	$ 329	512	$ 654
Defined Benefit Plan, Expected Return on Plan Assets	(132)	(165)	(264)	(328)
Pension Expense	$ 212	$ 164	$ 423	$ 326

Pension Liability Net Periodic

Pension Liability Net Periodic Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Postemployment Benefits [Abstract]
Defined Benefit Plan, Expected Return on Plan Assets	$ 132	$ 165	$ 264	$ 328
Defined Benefit Plan, Interest Cost	256	329	512	654
Defined Benefit Plan, Amortization of Gains (Losses)	88	0	175	0
Pension Expense	$ 212	$ 164	$ 423	$ 326

Pension Liability Net Pension L

Pension Liability Net Pension Liability (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded Status of Plan	$ (16,342)	$ (17,789)

Stock-Based Compensation (Detai

Stock-Based Compensation (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Jun. 30, 2015Rate	Jun. 30, 2016Rate	Jun. 30, 2015Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		42.00%		43.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		1.40%
Option contractual term	10 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term, in years	4 years
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate			1.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		4 years 4 months		4 years 4 months
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate			1.40%

Stock-Based Compensation Schedu

Stock-Based Compensation Schedule of stock-based compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation expense	$ 1,569	$ 693	$ 2,998	$ 1,180

Stock-Based Compensation Summar

Stock-Based Compensation Summary of stock option activity (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	495	537	495	642
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 17.30	$ 17.54	$ 17.30	$ 17.10
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0		0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(30)		135
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 17.85	15.55
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(12)		(12)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 26.32	$ 26.32

Stock-Based Compensation Summ66

Stock-Based Compensation Summary of non-vested Restricted Stock Units activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 34.77	$ 29.76
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value		$ 28.21	$ 28.21
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	353	393	353	233
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	57		287
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value		$ 25.93	$ 26.07
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(80)		(150)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(17)		(17)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 28.98	$ 27.49	$ 28.98	$ 26.10

Stock-Based Compensation Summ67

Stock-Based Compensation Summary of Stock Option Valuation Assumptions (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2015Rate	Jun. 30, 2016Rate	Jun. 30, 2015Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%		0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	42.00%		43.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.40%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	4 years 4 months		4 years 4 months
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		1.10%

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	Jun. 30, 2016USD ($)
Other Commitments [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed	$ 51.3

Related Party Transactions (Det

Related Party Transactions (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016USD ($)Companies	Jun. 30, 2015Companies	Jun. 30, 2016USD ($)Companies	Jun. 30, 2015Companies	Dec. 31, 2015USD ($)Companies
Related Party Transaction [Line Items]
Related Party Transactions, Number of Companies			2		1
Accounts Receivable, Related Parties | $	$ 9		$ 9		$ 83
Management [Member]
Related Party Transaction [Line Items]
Related Party Transactions, Number of Companies	3	1	3	2

Related Party Transactions Sche

Related Party Transactions Schedule of related party transactions (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)Companies	Jun. 30, 2015USD ($)	Dec. 31, 2015USD ($)Companies
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties	$ 9		$ 9		$ 83
Sales - related parties	$ 109	$ 112	$ 223	$ 311
Related Party Transactions, Number of Companies | Companies			2		1

Geographic and Customer Infor71

Geographic and Customer Information Significant Customer Sales (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue, Major Customer [Line Items]
Sales Revenue, Goods, Net	$ 100,752		$ 91,424		$ 187,045	$ 185,032
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Lam Research and Novellus Systems, Inc. [Member]
Revenue, Major Customer [Line Items]
Sales Revenue, Goods, Net	$ 27,237	$ 49,203	$ 24,535	$ 44,961
Concentration Risk, Percentage	22.90%		22.60%		22.20%	20.60%
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Applied Materials, Inc. [Member]
Revenue, Major Customer [Line Items]
Sales Revenue, Goods, Net	$ 39,032	$ 72,804	$ 28,719	$ 63,764
Concentration Risk, Percentage	32.90%		26.40%		32.80%	29.20%

Geographic and Customer Infor72

Geographic and Customer Information Significant Customer Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Revenue, Major Customer [Line Items]
Sales Revenue, Goods, Net	$ 100,752	$ 91,424	$ 187,045	$ 185,032
Accounts Receivable Percentage [Member] | Lam Research and Novellus Systems, Inc. [Member]
Revenue, Major Customer [Line Items]
Segment Reporting, Disclosure of Major Customers	0.2497203833				0.1332083917
Accounts Receivable Percentage [Member] | Applied Materials, Inc. [Member]
Revenue, Major Customer [Line Items]
Segment Reporting, Disclosure of Major Customers	0.3715123485				0.3119962154
Accounts Receivable [Member] | Lam Research and Novellus Systems, Inc. [Member]
Revenue, Major Customer [Line Items]
Segment Reporting, Disclosure of Major Customers	16,522				7,321
Accounts Receivable [Member] | Applied Materials, Inc. [Member]
Revenue, Major Customer [Line Items]
Segment Reporting, Disclosure of Major Customers	24,580				17,147

Credit Facility Narrative (Deta

Credit Facility Narrative (Details) - Wells Fargo Bank [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 50
Debt Instrument, Maturity Date	Oct. 12, 2017
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases	$ 15.5
Line of Credit Facility, Interest Rate at Period End	4.25%
Interest Expense	$ 0.2	$ 0.2

Uncategorized Items - aeis-2016

Label	Element	Value
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations	us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations	$ 125,285,000
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations	us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations	$ 169,720,000