10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_______________

FORM 10-Q

_______________

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2013

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission File Number 001-12515

_______________

OM GROUP, INC.

(Exact name of Registrant as specified in its charter)

_______________

Delaware  (State or other jurisdiction of incorporation or organization)	52-1736882  (I.R.S. Employer Identification No.)
127 Public Square, 1500 Key Tower, Cleveland, Ohio  (Address of principal executive offices)	44114-1221  (Zip Code)

216-781-0083

Registrant’s telephone number, including area code

_______________

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes x     No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes x     No ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.:

Large accelerated filer x	Accelerated filer  ¨
Non-accelerated filer o (Do not check if a smaller reporting company)	Smaller reporting company ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes ¨    No x

As of July 31, 2013 the registrant had 31,954,947 shares of Common Stock, par value $.01 per share, outstanding.

OM Group, Inc.

TABLE OF CONTENTS

PART I - FINANCIAL INFORMATION
Item 1.	Unaudited Financial Statements	2
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	17
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	28
Item 4.	Controls and Procedures	29
PART II - OTHER INFORMATION
Item 1A.	Risk Factors	29
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	29
Item 6.	Exhibits	30
	Signatures	31

1

PART I - FINANCIAL INFORMATION

Item 1. Unaudited Financial Statements

OM Group, Inc. and Subsidiaries

Unaudited Condensed Consolidated Balance Sheets

	June 30, 2013			December 31, 2012
(In thousands, except share data)
ASSETS
Current assets
Cash and cash equivalents	$	80,568		$	227,612
Restricted cash on deposit	—			22,793
Accounts receivable, less allowance of $4,339 in 2013 and $5,215 in 2012	159,888			160,122
Inventories	240,805			452,699
Other current assets	43,730			43,225
Current assets - discontinued operations (excluding cash)	—			33,126
Total current assets	524,991			939,577
Property, plant and equipment, net	323,298			474,346
Goodwill	418,661			528,312
Intangible assets, net	399,203			417,110
Other non-current assets	60,674			86,879
Non-current assets - discontinued operations	$	—		$	53,203
Total assets	$	1,726,827		$	2,499,427
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities
Current portion of long-term debt	$	—		$	13,309
Accounts payable	81,366			116,991
Liability related to joint venture partner injunction	—			22,793
Accrued income taxes	817			23,871
Accrued employee costs	34,307			46,629
Purchase price of VAC payable to seller	75,444			75,351
Other current liabilities	58,045			59,574
Current liabilities - discontinued operations	—			20,726
Total current liabilities	249,979			379,244
Long-term debt	—			454,054
Deferred income taxes	107,394			117,739
Pension liabilities	229,653			232,867
Purchase price of VAC payable to seller	11,273			11,259
Other non-current liabilities	52,478			55,383
Non-current liabilities - discontinued operations	—			4,733
Stockholders’ equity:
Preferred stock, $.01 par value:
Authorized 2,000,000 shares, no shares issued or outstanding	—			—
Common stock, $.01 par value:
Authorized 90,000,000 shares; 32,813,555 shares issued in 2013 and 32,108,212 shares issued in 2012	321			320
Capital in excess of par value	635,044			631,063
Retained earnings	557,974			671,012
Treasury stock (825,956 shares in 2013 and 216,695 shares in 2012, at cost)	(22,318		)	(7,681		)
Accumulated other comprehensive loss	(94,971		)	(88,005		)
Total OM Group, Inc. stockholders’ equity	1,076,050			1,206,709
Noncontrolling interests	—			37,439
Total equity	1,076,050			1,244,148
Total liabilities and equity	$	1,726,827		$	2,499,427

See accompanying notes to unaudited condensed consolidated financial statements.

2

OM Group, Inc. and Subsidiaries

Unaudited Condensed Consolidated Statements of Operations

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
(In thousands, except per share data)
Net sales	$	279,388		$	412,063		$	621,125		$	855,818
Cost of goods sold	215,608			372,278			483,117			719,924
Gross profit	63,780			39,785			138,008			135,894
Selling, general and administrative expenses	54,633			62,973			114,726			125,554
Operating profit	9,147			(23,188		)	23,282			10,340
Other income (expense):
Interest expense	(1,818		)	(11,177		)	(9,463		)	(22,733		)
Foreign exchange gain	2,838			6,028			164			898
Loss on divestiture of Advanced Materials business	(515		)	—			(112,061		)	—
Other, net	272			81			(386		)	144
Income (loss) from continuing operations before income tax expense	9,924			(28,256		)	(98,464		)	(11,351		)
Income tax (expense) benefit	(1,856		)	5,258			(4,455		)	320
Income (loss) from continuing operations, net of tax	8,068			(22,998		)	(102,919		)	(11,031		)
Income (loss) from discontinued operations, net of tax	(11,394		)	414			(11,870		)	295
Consolidated net loss	(3,326		)	(22,584		)	(114,789		)	(10,736		)
Net income attributable to noncontrolling interests	—			245			1,749			346
Net loss attributable to OM Group, Inc. common stockholders	$	(3,326	)	$	(22,339	)	$	(113,040	)	$	(10,390	)
Earnings (loss) per common share — basic:
Income (loss) from continuing operations attributable to OM Group, Inc. common stockholders	$	0.26		$	(0.71	)	$	(3.19	)	$	(0.34	)
Income (loss) from discontinued operations attributable to OM Group, Inc. common stockholders	(0.37		)	0.01			(0.38		)	0.01
Net loss attributable to OM Group, Inc. common stockholders	$	(0.11	)	$	(0.70	)	$	(3.57	)	$	(0.33	)
Earnings (loss) per common share — assuming dilution:
Income (loss) from continuing operations attributable to OM Group, Inc. common stockholders	$	0.26		$	(0.71	)	$	(3.19	)	$	(0.34	)
Income (loss) from discontinued operations attributable to OM Group, Inc. common stockholders	(0.37		)	0.01			(0.38		)	0.01
Net loss attributable to OM Group, Inc. common stockholders	$	(0.11	)	$	(0.70	)	$	(3.57	)	$	(0.33	)
Weighted average shares outstanding
Basic	31,452			31,882			31,673			31,878
Assuming dilution	31,621			31,882			31,673			31,878
Amounts attributable to OM Group, Inc. common stockholders:
Income (loss) from continuing operations, net of tax	$	8,068		$	(22,753	)	$	(101,170	)	$	(10,685	)
Income (loss) from discontinued operations, net of tax	(11,394		)	414			(11,870		)	295
Net income (loss)	$	(3,326	)	$	(22,339	)	$	(113,040	)	$	(10,390	)

See accompanying notes to unaudited condensed consolidated financial statements.

3

OM Group, Inc. and Subsidiaries

Unaudited Statements of Consolidated Comprehensive Income

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
(In thousands)
Consolidated net loss	(3,326		)	(22,584		)	(114,789		)	(10,736		)
Foreign currency translation adjustments	9,089			(44,204		)	(16,273		)	(14,846		)
Reclassification of foreign currency translation adjustment related to discontinued operations into earnings	8,838			—			8,838			—
Reclassification of hedging activities into earnings, net of tax	—			(1,123		)	—			(1,780		)
Unrealized gain on cash flow hedges, net of tax	(144		)	(622		)	(124		)	2,918
Pension adjustment	492			202			593			404
Net change in accumulated other comprehensive income (loss)	18,275			(45,747		)	(6,966		)	(13,304		)
Comprehensive income (loss)	14,949			(68,331		)	(121,755		)	(24,040		)
Comprehensive income attributable to noncontrolling interests	—			245			1,749			346
Comprehensive income (loss) attributable to OM Group, Inc.	$	14,949		$	(68,086	)	$	(120,006	)	$	(23,694	)

See accompanying notes to unaudited condensed consolidated financial statements.

4

OM Group, Inc. and Subsidiaries

Unaudited Condensed Consolidated Statements of Cash Flows

	Six Months Ended June 30
	2013			2012
(In thousands)
Operating activities
Consolidated net loss	$	(114,789	)	$	(10,736	)
Adjustments to reconcile consolidated net loss to net cash provided by (used for) operating activities:
Loss (gain) from discontinued operations	11,870			(295		)
Depreciation and amortization	38,063			41,842
Amortization of deferred financing fees	2,000			2,748
Share-based compensation expense	3,158			3,932
VAC lower of cost or market charges	—			53,751
Loss on divestiture of Advanced Materials business	112,061			—
Other non-cash items	5,649			(19,788		)
Changes in operating assets and liabilities, excluding the effect of divestitures
Accounts receivable	(34,666		)	(14,249		)
Inventories (includes $15.9 million of step up amortization in 2012)	16,809			76,125
Accounts payable	1,613			(60,705		)
Accrued tax	(23,872		)	264
Other, net	(24,691		)	(9,776		)
Net cash (used for) provided by operating activities	(6,795		)	63,113
Investing activities
Expenditures for property, plant and equipment	(21,261		)	(27,729		)
Proceeds from divestiture of Advanced Materials	302,086			—
Proceeds from divestiture of UPC business	63,300			—
Proceeds from sale of property	—			5,138
Net cash provided by (used for) investing activities	344,125			(22,591		)
Financing activities
Payments of long-term debt	(466,538		)	(8,027		)
Proceeds from exercise of stock options	1,005			—
Payment related to surrendered shares	(554		)	(254		)
Share repurchases	(14,083		)	—
Net cash used for financing activities	(480,170		)	(8,281		)
Effect of exchange rate changes on cash	(1,503		)	(3,808		)
Cash and cash equivalents
Increase (decrease) from continuing operations	(144,343		)	28,433
Discontinued operations - net cash used by operating activities	(282		)	(1,620		)
Discontinued operations - net cash used for investing activities	(2,419		)	(1,398		)
Balance at the beginning of the period	227,612			292,146
Balance at the end of the period	$	80,568		$	317,561

See accompanying notes to unaudited condensed consolidated financial statements.

5

Notes to Consolidated Financial Statements

OM Group, Inc. and Subsidiaries

(In thousands, except as noted and share and per share amounts)

Note 1 — Basis of Presentation

OM Group, Inc. ("OM Group", the “Company”, “we”, “our”, “us”) is a technology-based industrial growth company serving attractive global markets, including automotive systems, electronic devices, aerospace, industrial and renewable energy. We use innovative technologies to address customers' complex applications and demanding requirements. Our strategy is to grow organically through product innovation and new market and customer development; to grow strategically through synergistic acquisitions; and to maximize total stockholder return through a combination of business growth, financial discipline, optimal deployment of capital and continued operational excellence. Our objective is to deliver sustainable, profitable growth and create long-term stockholder value.

The consolidated financial statements include the accounts of OM Group and its consolidated subsidiaries. We were formed in 1991 as a Delaware Corporation. Intercompany accounts and transactions have been eliminated in consolidation. Until March 29, 2013, we held a 55% interest in a joint venture (“GTL”) that had a smelter in the Democratic Republic of Congo (the “DRC”). The joint venture was consolidated because we had a controlling interest in the joint venture. Noncontrolling interest was recorded for the remaining 45% interest. Our joint venture interests were transferred to the joint venture partners on March 29, 2013 as part of the divestiture of our Advanced Materials business.

On May 31, 2013 we completed the sale of our Ultra Pure Chemicals business. The results of our Ultra Pure Chemicals business are reported as discontinued operations in the accompanying unaudited condensed consolidated financial statements for all periods presented. See note 4 - Acquisitions and Divestitures.

These financial statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and the instructions to Form 10-Q and do not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of the financial position of the Company at June 30, 2013 and the results of its income (loss), comprehensive income (loss) and cash flows for the six months ended June 30, 2013 and 2012 have been included. The balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date but does not include all of the information or notes required by U.S. generally accepted accounting principles for complete financial statements. Past operating results are not necessarily indicative of the results which may occur in future periods, and the interim period results are not necessarily indicative of the results to be expected for the full year. These Unaudited Condensed Consolidated Financial Statements should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2012.

Note 2 — Recently Issued Accounting Guidance

Accounting Guidance adopted in 2013

In July 2012, the FASB issued amendments to the intangible assets guidance which provides an option for companies to use a qualitative approach to test indefinite lived intangible assets for impairment if certain conditions are met. The amendments are effective for annual and interim indefinite lived intangible assets impairment tests performed for fiscal years beginning after September 15, 2012. We adopted this guidance on January 1, 2013 and we do not expect that such adoption will have any effect on our results of operations or financial position.

In February 2013, the FASB issued amendments to the comprehensive income guidance to improve the transparency of reporting reclassifications out of Accumulated Other Comprehensive Income (AOCI). The update requires companies to disclose items reclassified out of AOCI and into net income in a single location either in the notes to the consolidated financial statements or on the face of the Consolidated Statements of Operations. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2012. We adopted this guidance as of March 31, 2013 and elected to include the disclosure in the notes to the consolidated financial statements. Such adoption did not have any effect on our results of operations or financial position.

6

Note 3 — Inventories

Inventories consist of the following:

	June 30,		December 31,
	2013		2012
Raw materials and supplies	$	79,468	$	133,864
Work-in-process	119,247		187,691
Finished goods	42,090		131,144
	$	240,805	$	452,699

On March 29, 2013, we completed the divestiture of our Advanced Materials business. Total Inventory in this segment as of December 31, 2012 was $193.7 million.

Note 4 — Acquisitions and Divestitures

(a) Acquisitions

VAC

On August 2, 2011, we acquired the equity interest in VAC Holding GmbH ("VAC") and the financial position, results of operations and cash flows of VAC are included in the Consolidated Financial Statements from that date. VAC is engaged in the development, manufacturing and distribution of high-performance industrial-use magnetic materials and related products and systems with exceptional magnetic and/or physical properties for a wide array of end markets, including automotive systems, energy conversion and distribution, electrical installation technology, industrial automation, aerospace and renewable energy. Our Magnetic Technologies segment consists of VAC.

The total purchase price of $812.2 million included cash consideration of $686.2 million, withheld consideration of $86.3 million, and the issuance of Company shares valued at $39.7 million. The withheld consideration relates to potential indemnification claims made by OM Group and accepted by the seller, if any, within two years of the closing date of the acquisition with certain exceptions related to tax matters. Two years after the acquisition, an escrow payment is due to the seller of VAC for which we currently have $75 million recorded. We financed the purchase with borrowings under a new senior secured credit facility (the “Senior Secured Credit Facility”) and cash on hand.

(b) Divestitures

Advanced Materials

On March 29, 2013, we completed the divestiture of our cobalt-based business. The transaction comprised the sale of the downstream portion of the business (including its cobalt refinery assets in Kokkola, Finland), and the transfer of equity interests in the DRC-based joint venture known as GTL to the joint venture partners, subject to a security interest in favor of OM Group with respect to the joint venture's performance related to certain supply arrangements.

In connection with this transaction we received cash proceeds of $329 million. At closing net proceeds of $302 million were received that consisted of the agreed purchase price of $325 million less excess cash on hand at closing of $19 million included in the net assets transferred and a transfer tax withheld of $4 million. We received additional proceeds of $27 million as an adjustment to the purchase price based on a post-closing analysis of the closing balance sheet in July 2013.

Including the adjustment to the purchase price, a loss of $112 million was recorded on the divestiture, which included a $10 million write-off of deferred financing fees related to the required debt pre-payment, a reserve for a note receivable from joint venture partner of $16 million and transaction expenses of $9 million.

The sale agreement for the downstream portion of the business also provides for potential future additional cash consideration of up to $110 million based on the business achieving certain revenue targets over a period of three years. Using our projected trends of cobalt prices and volumes, we do not believe it is probable that the business will meet the revenue targets, and no value was assigned to the potential future cash consideration while calculating the loss on the divestiture.

7

Following the sale, to assist in the transition of the downstream business, we entered into two agreements with the buyer pursuant to which: (1) we act as intermediary in a supply agreement between GTL and the buyer, in back-to-back arrangements for a period of at least two years, subject to delivery of 7000 MT of cobalt feed and extendable for up to an additional six months in order to deliver 7000 MT of cobalt feed; and, (2) we continue to serve as the U.S. distributor for refined cobalt products in primarily back-to-back arrangements for a period of up to one year after the closing. These agreements are expected to result in minimal statement of operations or cash flow impact for us and will be reported in the Advanced Materials segment until the agreements expire.

Ultra Pure Chemicals

On May 31, 2013, we completed the sale of our Ultra Pure Chemicals (UPC) business. In connection with this transaction we received cash proceeds of $63 million, which included an estimated $3 million working capital adjustment. A loss, net of tax, of $9.8 million was recorded on the divestiture, which included a gain of $1.5 million on the sale of net assets offset by the realization of a loss in accumulated other comprehensive income of $8.8 million, a $1.5 million write-off of deferred financing fees related to the required debt pre-payment and transaction expenses of $1 million.

The results of our UPC business are reported in discontinued operations in the accompanying unaudited condensed consolidated financial statements for all periods presented.  As required, annual interest expense of $2.5 million related to the debt repaid with the proceeds from the sale of the business was allocated to discontinued operations.

A summary of our discontinued operations impact is as follows:

	Three Months Ended June 30					Six Months Ended June 30
	2013			2012		2013			2012
(in thousands)
Net Sales	$	16,004		$	24,405	$	38,520		$	46,828
(Loss) Income from operations of divested business (net of tax)	$	(1,583	)	$	414	$	(2,059	)	$	295
Loss on disposal of business (net of tax)	(9,811		)	—		(9,811		)	—
(Loss) Income from discontinued operations (net of tax)	$	(11,394	)	$	414	$	(11,870	)	$	295
(Loss) Income per share from discontinued operations (net of tax)
Basic	$	(0.37	)	$	0.01	$	(0.38	)	$	0.01
Diluted	$	(0.37	)	$	0.01	$	(0.38	)	$	0.01

Details related to the net assets (excluding cash) and liabilities of our discontinued operations at December 31, 2012 are as follows:

	December 31, 2012
(in thousands)
Accounts receivable	$	20,341
Inventories	10,393
Other current assets	2,392
Property, plant and equipment, net	22,408
Other long term assets	15,838
Goodwill	14,957
Total assets of discontinued operations (excluding cash)	$	86,329
Accounts payable	$	15,627
Other current liabilities	5,099
Long-term liabilities	4,733
Total liabilities of discontinued operations	$	25,459

8

Note 5 — Debt

In connection with the acquisition of VAC, we entered into a Senior Secured Credit Facility. The borrowers under the Senior Secured Credit Facility are the Company and Harko C.V., a limited partnership organized under the laws of the Netherlands and a wholly-owned subsidiary of the Company (“Harko”). The Senior Secured Credit Facility provides for (i) a $100 million term loan A facility (the “Term A Facility”), (ii) a $350 million term loan B facility (the “Dollar Term B Facility”), (iii) a €175 million term loan facility (the “Euro Term B Facility” and, together with the Dollar Term B Facility, the “Term B Facility” and, together with the Term A Facility, the “Term Loan Facility”, each of which was fully drawn on August 2, 2011), and (iv) a $200 million undrawn revolving credit facility (the “Revolving Credit Facility”), of which up to $100 million may be denominated in Euros. The Revolving Credit Facility matures on August 2, 2016. As of June 30, 2013, we had no outstanding debt.

During the first quarter of 2013, we fully paid the outstanding balances of the Term B Facility by making principal pre-payments of $345.6 million on the Dollar Term B Facility and $27.2 million on the Euro Term B Facility using proceeds from the divestiture of the Advanced Materials business and cash on hand. We included $10.3 million of deferred financing fees in the loss on the divestiture since our Senior Secured Credit agreement requires the prepayment of debt with proceeds from a sale of a business.

During the second quarter of 2013, we fully paid the outstanding balances of the Term A Facility by making principal payments of $92.5 million using proceeds from the divestiture of the UPC business and cash on hand. We included $1.5 million of deferred financing fees in the loss on the divestiture of the UPC business since our Senior Secured Credit agreement requires the prepayment of debt with proceeds from a sale of a business.

We have the option to specify that interest be calculated based on either a London interbank offered rate (“LIBOR”) or on a variable base rate, plus, in each case, a calculated applicable margin range from 2.75% to 3.75%. At December 31, 2012, the weighted average interest rate for the outstanding borrowings under the Senior Secured Credit Facility was 5.66%.

The Senior Secured Credit Facility contains customary representations, warranties and covenants that limit the ability of the Company to, among other things: incur or guarantee additional indebtedness; pay distributions on capital stock; make investments; sell assets; consolidate, merge or transfer all or substantially all of their assets; and engage in transactions with affiliates. The Senior Secured Credit Facility also contains financial covenants related to a limitation on capital expenditures, measurement of the ratio of the Company's total indebtedness to the amount of the Company's adjusted "Consolidated EBITDA", and measurement of the interest coverage ratio as defined in the Senior Secured Credit Facility. As of June 30, 2013, we were in compliance with all of the covenants.

9

Note 6 — Derivative Instruments

Foreign Currency Exchange Rate Risk

Our primary Finnish operating subsidiary was included in the divestiture of our cobalt-based business on March 29, 2013. The functional currency for this subsidiary was the U.S. dollar since a majority of its purchases and sales were denominated in U.S. dollars. While a majority of the subsidiary’s raw material purchases were in U.S. dollars, it had some Euro-denominated operating expenses. From time to time, we would enter into foreign currency forward contracts to mitigate a portion of the earnings volatility in those Euro-denominated cash flows due to changes in the Euro/U.S. dollar exchange rate. As of June 30, 2013, we had no Euro forward contracts outstanding. We had Euro forward contracts with notional values that totaled 45.0 million Euros at June 30, 2012. As of June 30, 2012, AOCI included a cumulative loss related to such contracts of $2.7 million, all of which were reclassified to earnings in the fourth quarter 2012. We designated these derivatives as cash flow hedges of the subsidiary's forecasted Euro-denominated expenses. At June 30, 2012, we had a liability of $3.6 million recorded on the Unaudited Condensed Consolidated Balance Sheet in Other current liabilities related to these Euro forward contracts, all of which were reclassified to earnings in the fourth quarter 2012.

Interest Rate Risk

We utilize interest rate swap agreements to partially reduce risks related to variable rate financing agreements that are subject to changes in the market rate of interest.

We had interest rate swaps with notional values that totaled $198.5 million at June 30, 2012. Following the full repayment of the Term B facility at the end of March 2013, we elected in April 2013, to terminate all the remaining interest swaps contracts. The AOCI at the time of the termination represented an immaterial cumulative loss related to these contracts, which was reclassified to earnings in the second quarter 2013. At June 30, 2012, AOCI included a minimal cumulative loss related to these contracts, all of which was reclassified to earnings in the fourth quarter 2012. There was no hedge ineffectiveness in the six months ended June 30, 2013 or 2012, for these hedges.

Commodity Price Risk

In May 2013, we entered into nickel forward derivative contracts to establish a fixed margin and mitigate the risk of price volatility related to certain sales expected in 2013 and 2014 of nickel-containing finished products that were priced on a formula that included a fixed nickel price component. These forward derivative contracts have been designated as cash flow hedges for accounting purposes. We had forward contracts with fair values that totaled $0.3 million at June 30, 2013. There was no hedge ineffectiveness in the six months ended June 30, 2013 for these hedges.

Note 7 — Fair Value Disclosures

The following table shows our assets and liabilities accounted for at fair value on a recurring basis:

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
Description	June 30, 2013		(Level 1)		(Level 2)		(Level 3)
Liabilities:
Nickel forward derivatives	$	301	$	—	$	301	$	—
Contingent consideration payable	12,991		—		—		12,991
Total	$	13,292	$	—	$	301	$	12,991

The fair value of the derivative instruments have been determined based on the market equivalents at the balance sheet date, taking into account current commodity forward rates, therefore, they are classified within Level 2 of the valuation hierarchy. Our valuation techniques and Level 3 inputs used to estimate the fair value of the contingent consideration payable in connection with our acquisition of Rahu Catalytics Limited ("Rahu") are described below. There were no transfers into or out of Levels 1, 2 or 3 in 2013.

10

The following table summarizes changes in Level 3 liabilities measured at fair value on a recurring basis:

		Contingent Consideration
Fair Value at	December 31, 2012	$	12,411
Accretion expense		784
Foreign exchange		(204		)
Fair Value at	June 30, 2013	$	12,991

We acquired Rahu on December 22, 2011. The purchase price included contingent consideration of up to an additional €20.0 million ($26.2 million at June 30, 2013) based on achieving certain volume targets over a fifteen year period ending on December 31, 2026. We estimated the fair value of the contingent consideration using probability-weighted expected future cash flows and applied a discount rate that appropriately captures a market participant's view of the risk associated with the contingent consideration. Contingent consideration is included in Other non-current liabilities in the Unaudited Condensed Consolidated Balance Sheet. The valuation of the contingent consideration is classified utilizing Level 3 inputs consistent with assumptions which would be made by other market participants. There are many factors that could impact the likelihood that we will pay the contingent consideration and therefore its value, including overall economic conditions and our ability to drive sales volumes as planned. A change in a market participant view of risks could also impact the value of the contingent consideration.

We also hold financial instruments consisting of cash, accounts receivable, and accounts payable. The carrying amounts of cash, accounts receivable, and accounts payable approximate fair value due to the short-term maturities of these instruments. Long-term debt was repaid during the second quarter 2013 and previously had a fair value based on quoted market prices in previous periods, which are Level 1 inputs. Derivative instruments are recorded at fair value as indicated above.

Note 8 — Income Taxes

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various U.S. state and foreign jurisdictions. Our major tax jurisdictions are the U.S. and Germany. With few exceptions, we are no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2006. The Internal Revenue Service is currently examining our 2010 U.S. federal income tax return and Finnish tax authorities are currently examining tax returns for the years 2007-2011. VAC's German tax returns have been audited through 2005. We are indemnified, subject to certain limitations, for any pre-acquisition income tax liabilities of VAC. German tax authorities are currently examining VAC's income tax returns for the years 2006-2009.

As required under ASC 740, our interim income tax provision is based on the application of an estimated annual effective income tax rate applied to year-to-date ordinary income from continuing operations before income tax expense. In determining the estimated annual effective income tax rate, we analyze various factors, including forecasts of projected annual earnings (including specific subsidiaries projected to have pretax income and pretax losses), taxing jurisdictions in which the earnings will be generated, our ability to use tax credits and net operating loss carryforwards, and available tax planning alternatives. We evaluate the estimated annual effective income tax rate on a quarterly basis based on current and forecasted earnings by tax jurisdiction, including changes in the Company's structure. The estimated annual effective income tax rate may be significantly impacted by changes to the mix of forecasted earnings by tax jurisdiction. The tax effects of adjustments to the estimated annual effective income tax rate are recorded in the period such estimates are revised. The tax effects of discrete items, including the effect of changes in tax laws, tax rates, certain circumstances with respect to valuation allowances or other unusual or non-recurring items, are reflected in the period in which they occur as an addition to, or reduction from, the income tax provision, rather than included in the estimated annual effective income tax rate.

11

Income (loss) from continuing operations before income tax expense consists of the following:

	Three Months Ended June 30						Six Months Ended June 30
	2013			2012			2013			2012
United States	$	189		$	(1,567	)	$	(3,686	)	$	(2,018	)
Outside the United States	9,735			(26,689		)	(94,778		)	(9,333		)
Income (loss) from continuing operations before income tax expense	$	9,924		$	(28,256	)	$	(98,464	)	$	(11,351	)
Effective Income Tax Rate	18.7		%	18.6		%	(4.5		)%	2.8		%

The effective income tax rates for the three months ended June 30, 2013 and June 30, 2012 are lower than the U.S. statutory tax rate primarily due to income earned in tax jurisdictions with lower statutory rates than the U.S. (primarily Germany, Finland, Malaysia and Taiwan) and a tax-efficient financing structure, partially offset by losses in certain jurisdictions (including the U.S.) with no corresponding tax benefit.

Our effective income tax rate for the six months ended June 30, 2013 was negatively impacted by special charges related to the divestiture of the Advanced Materials business. There were no tax benefits on the losses on the divestitures of the Advanced Materials and UPC businesses due to the Company's legal entity and tax structure.

Our effective income tax rate for the six months ended June 30, 2012 was impacted by the charges related to the VAC inventory purchase accounting step-up and LCM charges.

Note 9 — Defined Benefit Plans

At June 30, 2013 and December 31, 2012, we had pension liabilities of $238.7 million and $242.5 million, respectively, the majority of which were assumed in the 2011 VAC acquisition and the 2010 EaglePicher Technologies acquisition.

Set forth below is a detail of the net periodic pension expense for the U.S. defined benefit plans;

	Three Months Ended June 30						Six Months Ended June 30
	2013			2012			2013			2012
Service cost	$	296		$	258		$	591		$	544
Interest cost	2,114			2,762			4,229			5,056
Amortization of unrecognized net loss	211			218			423			419
Expected return on plan assets	(2,731		)	(2,623		)	(5,245		)	(5,236		)
Total expense	$	(110	)	$	615		$	(2	)	$	783

Set forth below is a detail of the net periodic pension expense for the VAC defined benefit plans;

	Three Months Ended June 30				Six Months Ended June 30
	2013		2012		2013		2012
Service cost	$	1,172	$	939	$	2,357	$	1,899
Interest cost	1,461		1,855		2,938		3,750
Amortization of unrecognized net loss	263		—		529		—
Total expense	$	2,896	$	2,794	5,824		5,649

Note 10 — Share Repurchase Program

On January 21, 2013, we announced that our Board of Directors had authorized the repurchase of up to $50 million of the Company's outstanding common shares through open market repurchases, negotiated block transactions or open market solicitation for shares. As of June 30, 2013, we repurchased 0.6 million of our common shares for total consideration of $14.1 million. These shares are accounted for as treasury shares and the purchases were funded from our available cash balances.

12

Note 11 — Accumulated Other Comprehensive Income (Loss)

(a) Changes in Accumulated Comprehensive Income (Loss) by Component

	Foreign Currency Translation Loss			Unrealized Gains and Losses on Cash Flow Hedging Derivatives			Pension and Post-Retirement Obligation			Accumulated Other Comprehensive Income (Loss)
Beginning Balance at January 1, 2013	$	(21,299	)	$	(84	)	$	(66,622	)	$	(88,005	)
Other comprehensive income (loss) before reclassifications	(20,948		)	(184		)	593			(20,539		)
Amounts reclassified from accumulated other comprehensive (income) loss	13,513			60			—			13,573
Net current-period other comprehensive income (loss)	(7,435		)	(124		)	593			(6,966		)
Ending balance at June 30, 2013	$	(28,734	)	$	(208	)	$	(66,029	)	$	(94,971	)

(b) Reclassifications out of Accumulated Other Comprehensive Income (loss)

Details about Accumulated Other Comprehensive Income (loss) Components	Amount Reclassified from Accumulated Other Comprehensive Income (loss)			Affected Line Item in the Statement Where Net Income is Presented
Foreign currency translation	$	(135	)	Foreign exchange gain/(loss)
	(4,540		)	Loss on divestiture of Advanced Materials business
	(8,838		)	Loss from discontinued operations, net of tax
	$	(13,513	)	Total before tax
	—			Tax (expense) or benefit
	$	(13,513	)	Net of Tax
Unrealized gains and losses on cash flow hedging derivatives	(60		)	Interest expense

13

Note 12 — Earnings (Loss) Per Share

The following table sets forth the computation of basic and dilutive income (loss) per common share from continuing operations attributable to OM Group, Inc. common stockholders:

	Three Months Ended June 30					Six Months Ended June 30
Amounts attributable to OM Group, Inc. common stockholders:	2013		2012			2013			2012
(in thousands, except per share amounts)
Income (loss) from continuing operations, net of tax	$	8,068	$	(22,753	)	$	(101,170	)	$	(10,685	)
Earnings (loss) per common share - basic:
Income (loss) from continuing operations	$	0.26	$	(0.71	)	$	(3.19	)	$	(0.34	)
Earnings (loss) per common share - assuming dilution:
Income (loss) from continuing operations	$	0.26	$	(0.71	)	$	(3.19	)	$	(0.34	)
Weighted average shares outstanding — basic	31,452		31,882			31,673			31,878
Dilutive effect of stock options and restricted stock	169		—			—			—
Weighted average shares outstanding — assuming dilution	31,621		31,882			31,673			31,878

The following table sets forth the computation of basic and diluted net income (loss) per common share attributable to OM Group, Inc. common stockholders:

	Three Months Ended June 30						Six Months Ended June 30
Amounts attributable to OM Group, Inc. common stockholders:	2013			2012			2013			2012
(in thousands, except per share amounts)
Net income (loss)	$	(3,326	)	$	(22,339	)	$	(113,040	)	$	(10,390	)
Earnings (loss) per common share - basic:
Net income (loss)	$	(0.11	)	$	(0.70	)	$	(3.57	)	$	(0.33	)
Earnings per common share - assuming dilution:
Net income (loss)	$	(0.11	)	$	(0.70	)	$	(3.57	)	$	(0.33	)
Weighted average shares outstanding — basic	31,452			31,882			31,673			31,878
Dilutive effect of stock options and restricted stock	169			—			—			—
Weighted average shares outstanding — assuming dilution	31,621			31,882			31,673			31,878

We use the treasury stock method to calculate the effect of outstanding share-based compensation awards, which requires us to compute total employee proceeds as the sum of (a) the amount the employee must pay upon exercise of the award, (b) the amount of unearned share-based compensation costs attributed to future services and (c) the amount of tax benefits, if any, that would be credited to additional paid-in capital assuming exercise of the award. Shares, under share-based compensation awards, for which the total employee proceeds exceed the average market price over the applicable period have an anti-dilutive effect on earnings per share, and accordingly, are excluded from the calculation of diluted earnings per share.

In the three months ended June 30, 2013, stock options to purchase 0.3 million shares of common stock were excluded from the calculation of dilutive earnings per share because the options’ exercise prices were greater than the average market price of the common shares and, therefore, the effect would have been anti-dilutive.

14

Note 13 — Share-Based Compensation

Set forth below is a summary of share-based compensation expense for option grants, restricted stock awards and restricted stock unit awards included as a component of Selling, general and administrative expenses in the Unaudited Condensed Statements of Consolidated Income (in thousands):

	Three Months Ended June 30					Six Months Ended June 30
	2013		2012			2013		2012
Stock options and restricted stock awards	$	1,402	$	1,282		$	2,738	$	3,558
Restricted stock unit awards	51		(232		)	182		111
Share-based compensation expense - employees	$	1,453	$	1,050		$	2,920	$	3,669
Share-based compensation expense - non-employee directors	$	113	$	132		$	238	$	263

No tax benefit for share-based compensation was realized during 2013 or 2012 as a result of a valuation allowance against the deferred tax assets.

At June 30, 2013, there was $11.4 million of unrecognized compensation expense related to unvested share-based awards. That cost is expected to be recognized as follows: $3.2 million in the last six months of 2013, $4.8 million in 2014, $3.2 million in 2015 and $0.2 million in 2016 as a component of Selling, general and administrative expenses. Unearned compensation expense is recognized over the vesting period for the particular grant. Total unrecognized compensation cost will be adjusted for future changes in actual and estimated forfeitures, updated vesting assumptions for the performance awards, and fluctuations in the fair value of restricted stock unit awards.

Non-employee directors of the Company are paid a portion of their annual retainer in unrestricted shares of common stock. For purposes of determining the number of shares of common stock to be issued, the 2007 Plan provides that shares are to be valued at the average of the high and low sale price of the Company’s common stock on the NYSE on the last trading date of the quarter. Pursuant to this plan, the Company issued 5,078 shares and 11,049 shares in the three and six months ended June 30, 2013 and 4,711 shares and 9,703 shares in the three and six months ended June 30, 2012, respectively, to non-employee directors.

Note 14 — Commitments and Contingencies

During 2009 and 2010, GTL was served in Jersey, Channel Islands, with injunctions that prohibited GTL from making payments of up to $108.3 million to Gécamines, a minority partner in GTL, including amounts payable for raw material purchases, and restrained Gécamines from removing any of its assets from the island of Jersey up to the amount of 14.5 million British Pounds. In both matters, payments which we would typically have made to Gécamines were instead placed on deposit with the Royal Court of Jersey ("Court"). As of December 31, 2012, $22.8 million remained on deposit with the Court and was recorded as Restricted cash on deposit and Liability related to joint venture partner injunction in the Consolidated Balance Sheets. In January 2013, the case related to the second injunction was dropped, and remaining funds on deposit with the Court were released by GTL to Gécamines in March 2013. Our interest in GTL was transferred to the joint venture partners on March 29, 2013.

We have potential contingent liabilities with respect to environmental matters related to our former operations in Brazil and Germany which were sold in 2003. Environmental cost-sharing arrangements are in place between the original owner and operator of these operations and between the Company and the subsequent purchaser of these operations. We have reviewed the limited information made available to us on the environmental conditions and are awaiting more detailed information from the purchaser. We cannot currently evaluate whether or not, or to what extent, we will be responsible for any remediation costs until more detailed information is received.

From time to time, we are subject to various legal and regulatory proceedings, claims and assessments that arise in the normal course of business. The ultimate resolution of such proceedings, claims and assessments is inherently unpredictable and, as a result, our estimates of liability, if any, are subject to change and actual results may materially differ from such estimates. Our estimate of any costs to be incurred as a result of these proceedings, claims and assessments are accrued when the liability is considered probable and the amount can be reasonably estimated. We believe the amount of any potential liability with respect to legal and regulatory proceedings, claims and assessments will not have a material adverse effect upon our financial condition, results of operations, or cash flows.

15

Note 15 — Reportable Segments

We operate and report our results in four operating segments: Magnetic Technologies, Battery Technologies, Specialty Chemicals, and Advanced Materials. Intersegment transactions are generally recognized based on current market prices and are eliminated in consolidation. Corporate is comprised of general and administrative expenses not allocated to the operating segments.

The following table reflects the results of our reportable segments:

	Three Months Ended June 30						Six Months Ended June 30
	2013			2012			2013			2012
Net Sales
Magnetic Technologies	$	128,864		$	168,024		$	266,014		$	358,515
Battery Technologies	40,205			35,205			81,239			72,237
Specialty Chemicals (d)	83,444			84,810			160,749			168,298
Advanced Materials	26,875			124,261			113,313			257,234
Intersegment items	—			(237		)	(190		)	(466		)
	$	279,388		$	412,063		$	621,125		$	855,818
Operating profit
Magnetic Technologies (a) (b)	$	1,153		$	(30,146	)	$	7,512		$	(16,243	)
Battery Technologies (a)	8,155			6,063			16,473			11,718
Specialty Chemicals (a) (c) (d)	8,167			9,670			15,212			22,284
Advanced Materials	(381		)	923			1,365			12,034
Corporate	(7,947		)	(9,698		)	(17,280		)	(19,453		)
	9,147			(23,188		)	23,282			10,340
Interest expense	(1,818		)	(11,177		)	(9,463		)	(22,733		)
Foreign exchange gain (loss)	2,838			6,028			164			898
Loss on divestiture of Advanced Materials business	(515		)	—			(112,061		)	—
Other expense, net	272			81			(386		)	144
	777			(5,068		)	(121,746		)	(21,691		)
Income (loss) from continuing operations before income taxes	$	9,924		$	(28,256	)	$	(98,464	)	$	(11,351	)
Expenditures for property, plant & equipment
Magnetic Technologies	$	5,106		$	6,499		$	8,007		$	9,995
Battery Technologies	848			1,002			1,901			2,223
Specialty Chemicals (d)	2,796			1,319			5,013			1,814
Advanced Materials	—			8,560			6,340			13,697
Corporate										—
	$	8,750		$	17,380		$	21,261		$	27,729
Depreciation and amortization
Magnetic Technologies	$	10,705		$	10,010		$	21,469		$	20,222
Battery Technologies	2,531			2,509			5,033			5,011
Specialty Chemicals (d)	3,647			3,986			7,498			7,852
Advanced Materials	(333		)	4,271			3,871			8,495
Corporate	131			147			192			262
	$	16,681		$	20,923		$	38,063		$	41,842

(a) The three and six months ended June 30, 2013 include costs related to cost reduction initiatives of $0.4 million and $4.2 million in Magnetic Technologies, $0.5 million and $0.7 million in Battery Technologies, and $1.1 million and $1.1 million in Specialty Chemicals, respectively.

(b) The three and six months ended June 30, 2012 includes inventory step-up and LCM charges of $31.5 million and $47.3 million, respectively, resulting from purchase accounting for the VAC acquisition.

(c) The six months ended June 30, 2012 includes a $2.9 million property sale gain.

(d) All results related to the UPC business are excluded from the Special Chemicals segment for all periods presented.

16

Item 2.  Management’s Discussion and Analysis of Financial Condition and Results of Operations

Management’s discussion and analysis of financial condition and results of operations should be read in conjunction with the consolidated financial statements and the notes thereto appearing elsewhere in this Form 10-Q.

General

OM Group, Inc. ("OM Group", the “Company”, “we”, “our”, “us”) is a technology-based industrial growth company serving attractive global markets, including automotive systems, electronic devices, aerospace, industrial and renewable energy. We use innovative technologies to address customers' complex applications and demanding requirements. Our strategy is to grow organically through product innovation and new market and customer development, to grow strategically through synergistic acquisitions, and to maximize total stockholder return through a combination of business growth, financial discipline, optimal deployment of capital and continued operational excellence. The objective is to deliver sustainable, profitable growth and create long-term stockholder value.

On March 29, 2013, we completed the divestiture of our cobalt-based business. In connection with this transaction, we received net proceeds of $329 million, including $302 million at the time of closing, and an additional $27 million in July 2013 as an adjustment to the purchase price based on a post-closing analysis of the closing balance sheet. As required by the Company's Senior Secured Credit agreement, the $302 million of net proceeds received at closing were used, together with cash on hand, to repay approximately $346 million of our Term B debt. A loss of $112 million was recorded on the divestiture including $10.3 million for the write-off of deferred financing fees related to the required debt prepayment, a reserve for a note receivable from joint venture partner of $16 million and transaction expenses of $9 million. The sale agreement for the downstream portion of the business also provides for potential future additional cash consideration of up to $110 million based on the business achieving certain revenue targets over a period of three years. Using our projected trends of cobalt prices and volumes, we do not believe it is probable that the business will meet the revenue targets, and no value was assigned to the potential future cash consideration while calculating the loss on the divestiture.

On May 31, 2013, we completed the divestiture of our Ultra Pure Chemicals (UPC) business for cash proceeds of $63 million. The results of operations of the UPC business are reflected as discontinued operations in the accompanying unaudited condensed consolidated financial statements for all periods presented. A loss, net of tax, of $9.8 million was recorded on the divestiture, which included a $1.5 million dollar gain on the sale of net assets offset by the realization of a loss in accumulated other comprehensive income of $8.8 million, a $1.5 million write-off of deferred financing fees related to the required debt pre-payment and transaction expenses of $1 million. We used the proceeds of the UPC divestiture, along with cash on hand, to repay our remaining indebtedness. As of June 30, 2013, we had no outstanding debt.

We operate three strategic business platforms: Magnetic Technologies, Battery Technologies, and Specialty Chemicals. We also have limited continuing involvement in the Advanced Materials business through transition agreements with the buyer as described below.

Magnetic Technologies

The Magnetic Technologies segment develops, manufactures and distributes differentiated, high-performance industrial-use magnetic materials and related products and systems with exceptional magnetic and/or physical properties for a wide array of end markets, including automotive systems, energy conversion and distribution, electrical installation technology, industrial automation, aerospace and renewable energy.

Battery Technologies

The Battery Technologies segment provides advanced batteries, battery management systems, battery-related research and energetic devices primarily for the defense, aerospace and medical markets. The segment is also developing products for emerging markets including grid energy storage and oil and gas.

17

Specialty Chemicals

The Specialty Chemicals segment develops, produces and supplies chemicals for electronic and industrial applications and photomasks used by customers to produce semiconductors and related products.

Advanced Materials (divested)

As discussed above, on March 29, 2013, we exited this business. During 2012 and through the date of sale, this business manufactured inorganic products using unrefined cobalt and other metals, for the mobile energy storage, renewable energy, automotive systems, construction and mining, and industrial end markets. It also had a 55% interest in GTL.

Following the sale, to assist in the transition of the downstream business, we entered into two agreements with the buyer pursuant to which: (1) we act as intermediary in a supply agreement between GTL and the buyer, in back-to-back arrangements for a period of at least two years, subject to delivery of 7,000 MT of cobalt feed and extendable for up to an additional six months in order to deliver 7,000 MT of cobalt feed; and, (2) we continue to serve as the U.S. distributor for refined cobalt products in primarily back-to-back arrangements for a period of up to one year after the closing. These agreements are expected to result in minimal statement of operations or cash flow impact for us and will be reported in the Advanced Materials segment until the agreements expire.

Executive Overview - Second Quarter 2013

Net sales decreased in the second quarter of 2013 compared to the prior year period, due primarily to the divestiture of the Advanced Materials business and lower rare earth prices in 2013. Rare earth prices spiked abnormally in mid-2011 and have been in steady decline since that time, impacting net sales in the Magnetic Technologies business in the year-over-year comparison. Battery Technologies net sales increased 14.2% in 2013 compared to the prior year driven by higher sales volumes, primarily into defense markets. In Specialty Chemicals, net sales were relatively flat compared to the prior year.

Operating profit was higher in the second quarter of 2013 compared to the prior year period, due primarily to charges related to purchase accounting and lower of cost or market (LCM) at VAC in the second quarter of 2012, partially offset by rare earth pricing benefits in 2012. Excluding these items, operating profit declined in the second quarter of 2013 versus the prior year period due primarily to lower volumes in Magnetic Technologies caused by economic weakness in European markets, partially offset by higher volumes in Battery Technologies and lower corporate expenses.

Operating profit in the second quarter of 2013 includes $2.0 million of charges related to our previously-announced, enterprise-wide cost-reduction initiatives. These initiatives include headcount reductions, minor facility consolidations, supply chain optimization, corporate cost reductions, and other structural changes to improve profitability, and in total had a $3 million positive impact in the second quarter across the Company. Excluding these charges, operating profit would have been $11.1 million. Excluding these charges, as well as the results from the now-divested Advanced Materials and UPC businesses (UPC is included in discontinued operations), adjusted operating profit and adjusted EBITDA for the second quarter and six months ended June 30, 2013 are $11.5 million and $28.5 million, and $27.9 million and $62.1 million, respectively. See tables below for reconciliations of these non-GAAP numbers.

18

Consolidated Operating Results

	Three months ended										Six months ended
	June 30,										June 30,
(in thousands & percent of net sales)	2013					2012					2013					2012
Net sales	$	279,388				$	412,063				$	621,125				$	855,818
Cost of goods sold	215,608					372,278					483,117					719,924
Gross profit	63,780			22.8	%	39,785			9.7	%	138,008			22.2	%	135,894			15.9	%
Selling, general and administrative expenses	54,633			19.6	%	62,973			15.3	%	114,726			18.5	%	125,554			14.7	%
Operating profit	9,147			3.3	%	(23,188		)	(5.6	)%	23,282			3.7	%	10,340			1.2	%
Loss on divestiture of Advanced Materials business	(515		)			—					(112,061		)			—
Other expense, net	1,292					(5,068		)			(9,685		)			(21,691		)
Income tax expense	(1,856		)			5,258					(4,455		)			320
Income (loss) from continuing operations, net of tax	8,068					(22,998		)			(102,919		)			(11,031		)
Loss from discontinued operations, net of tax	(11,394		)			414					(11,870		)			295
Consolidated net loss	(3,326		)			(22,584		)			(114,789		)			(10,736		)
Net income (loss) attributable to noncontrolling interest	—					245					1,749					346
Net loss attributable to OM Group, Inc. common stockholders	$	(3,326	)			$	(22,339	)			$	(113,040	)			$	(10,390	)
Amounts attributable to OM Group, Inc. common stockholders:
Income (loss) from continuing operations, net of tax	$	8,068				$	(22,753	)			$	(101,170	)			$	(10,685	)
Loss from discontinued operations, net of tax	(11,394		)			414					(11,870		)			295
Net loss	$	(3,326	)			$	(22,339	)			$	(113,040	)			$	(10,390	)
Earnings (loss) per common share — assuming dilution:
Income (loss) from continuing operations attributable to OM Group, Inc. common stockholders	$	0.26				$	(0.71	)			$	(3.19	)			(0.34		)
Loss from discontinued operations attributable to OM Group, Inc. common stockholders	(0.37		)			0.01					(0.38		)			0.01
Net income (loss) attributable to OM Group, Inc. common stockholders	$	(0.11	)			$	(0.70	)			$	(3.57	)			(0.33		)

We are providing adjusted operating profit (loss), adjusted EBITDA, and adjusted earnings per common share attributable to OM Group, Inc. common stockholders - assuming dilution, which are non-GAAP financial measures. The tables below present reconciliations of these amounts to the comparable U.S. GAAP amounts. We believe that the non-GAAP financial measures presented in the tables facilitate a comparative assessment of our operating performance and enhance investors' understanding of the performance of our operations. The non-GAAP financial information set forth in the tables below are not alternatives to reported results determined in accordance with U.S. GAAP.

19

	For the quarter ended
	June 30, 2013
(in thousands)	Magnetic Technologies		Battery Technologies		Specialty Chemicals		Advanced Materials			Corporate			Consolidated
Operating profit (loss) - as reported	$	1,153	$	8,155	$	8,167	$	(381	)	$	(7,947	)	$	9,147
Charges related to cost-reduction initiatives	369		518		1,096		—			—			1,983
Adjusted operating profit	1,522		8,673		9,263		(381		)	(7,947		)	11,130
Depreciation and amortization	10,705		2,531		3,647		(333		)	131			16,681
Adjusted EBITDA	$	12,227	$	11,204	$	12,910	$	(714	)	$	(7,816	)	$	27,811

	June 30, 2012
(in thousands)	Magnetic Technologies			Battery Technologies		Specialty Chemicals		Advanced Materials		Corporate			Consolidated
Operating profit (loss) - as reported	$	(30,146	)	$	6,063	$	9,670	$	923	$	(9,698	)	$	(23,188	)
Total VAC inventory purchase accounting step-up and LCM charges	31,545			—		—		—		—			31,545
Adjusted operating profit	1,399			6,063		9,670		923		(9,698		)	8,357
Depreciation and amortization	10,010			2,509		3,986		4,271		147			20,923
Adjusted EBITDA	$	11,409		$	8,572	$	13,656	$	5,194	$	(9,551	)	$	29,280

	For the six months ended
	June 30, 2013
(in thousands)	Magnetic Technologies		Battery Technologies		Specialty Chemicals		Advanced Materials		Corporate			Consolidated
Operating profit (loss) - as reported	$	7,512	$	16,473	$	15,212	$	1,365	$	(17,280	)	$	23,282
Charges related to cost-reduction initiatives	4,225		687		1,134		—		—			6,046
Adjusted operating profit	11,737		17,160		16,346		1,365		(17,280		)	29,328
Depreciation and amortization	21,469		5,033		7,498		3,871		192			38,063
Adjusted EBITDA	$	33,206	$	22,193	$	23,844	$	5,236	$	(17,088	)	$	67,391

	June 30, 2012
(in thousands)	Magnetic Technologies			Battery Technologies		Specialty Chemicals			Advanced Materials		Corporate			Consolidated
Operating profit (loss) - as reported	$	(16,243	)	$	11,718	$	22,284		$	12,034	$	(19,453	)	$	10,340
Total VAC inventory purchase accounting step-up and LCM charges	47,272			—		—			—		—			47,272
Gain on sale of property	—			—		(2,857		)	—		—			(2,857		)
Adjusted operating profit	31,029			11,718		19,427			12,034		(19,453		)	54,755
Depreciation and amortization	20,222			5,011		7,852			8,495		262			41,842
Adjusted EBITDA	$	51,251		$	16,729	$	27,279		$	20,529	$	(19,191	)	$	96,597

Charges for cost-reduction initiatives in the three and six months ended June 30, 2013 are described above. VAC inventory purchase accounting step-up and LCM charges in the three and six months ended June 30, 2012 represent charges resulting from purchase accounting for the VAC acquisition and an LCM charge. These charges were a direct result of acquisition accounting and the rare earth price decline from the abnormal spike in rare earth prices that occurred following the acquisition of VAC in 2011 and had no impact on our cash balances and did not impact our liquidity.

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	Three Months Ended												Six Months Ended
	June 30,												June 30,
	2013						2012						2013						2012
(in thousands, except per share data)	$			Diluted EPS			$			Diluted EPS			$			Diluted EPS			$			Diluted EPS
Income (loss) from continuing operations attributable to OM Group, Inc. common stockholders - as reported	8,068			0.26			(22,753		)	(0.71		)	(101,170		)	(3.17		)	(10,685		)	(0.33		)
Add (Less):
Loss on divestiture of Advanced Materials business	515			0.02			—			—			112,061			3.52			—			—
Charges related to cost-reduction initiatives	1,983			0.06			—			—			6,046			0.19			—			—
VAC inventory purchase accounting step-up and LCM charges	—			—			31,545			0.98			—			—			47,272			1.47
Gain on sale of property	—			—			—			—			—			—			(2,857		)	(0.09		)
Acceleration of deferred financing fees, net of tax	462			0.01			—			—			462			0.01			—			—
Tax effect of special items	(289		)	(0.01		)	(6,415		)	(0.20		)	(935		)	(0.03		)	(11,270		)	(0.35		)
Adjusted income from continuing operations attributable to OM Group, Inc.	$	10,739		$	0.34		$	2,377		$	0.07		$	16,464		$	0.52		$	22,460		$	0.70
Weighted average shares outstanding - diluted (a)				31,621						32,002						31,843						32,017

(a) For the six months ended June 30, 2013 and the three and six months ended June 30, 2012 , because the reported loss from continuing operations is income on an adjusted basis, we used diluted shares to calculate EPS.

Second Quarter of 2013 Compared with Second Quarter of 2012

The following table identifies, by segment, the components of change in net sales and operating profit for the three months ended June 30, 2013, compared with the three months ended June 30, 2012:

(in thousands)	Net sales			Operating profit - as reported			Adjusted operating profit
2012	$	412,063		$	(23,188	)	$	8,357
Change in 2013 from:
Magnetic Technologies	(39,160		)	31,299			123
Battery Technologies	5,000			2,092			2,610
Specialty Chemicals	(1,366		)	(1,503		)	(407		)
Advanced Materials	(97,386		)	(1,304		)	(1,304		)
Corporate	—			1,751			1,751
Intersegment items	237			—			—
2013	$	279,388		$	9,147		$	11,130

Net sales decreased $132.7 million, or 32.2%, primarily due to lower sales in Magnetic Technologies driven by lower rare earth prices and lower volumes, the divestiture of Advanced Materials, and lower sales volumes in Specialty Chemicals, all partially offset by higher volumes in Battery Technologies.

Gross profit increased to $63.8 million, or 22.8% of sales, in the three months ended June 30, 2013, compared with $39.8 million, or 9.7% of sales, in the three months ended June 30, 2012, primarily due to acquisition-related and LCM charges in 2012 related to Magnetic Technologies inventory and lower sales. Excluding these charges and the 2012 rare earth pricing benefits, gross profit was lower in 2013 due to lower sales volumes at Magnetic Technologies, partially offset by higher sales volumes in Battery Technologies.

Selling, general and administrative expenses (“SG&A”) decreased to $54.6 million in the three months ended June 30, 2013from $63.0 million in the three months ended June 30, 2012. SG&A as a percentage of net sales was 19.6% in the three months ended June 30, 2013compared with 15.3% in the three months ended June 30, 2012; the higher percentage in 2013 is due to the divestiture of Advanced Materials, which had a low SG&A percentage.

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The following table summarizes the components of Other expense, net for the three months ended June 30:

(in thousands)	2013			2012			Change
Interest expense	$	(1,818	)	$	(11,177	)	$	9,359
Foreign exchange gain	2,838			6,028			(3,190		)
Loss on divestiture of Advanced Materials business	(515		)	—			(515		)
Other expense, net	272			81			191
	$	777		$	(5,068	)	$	5,845

The decrease in interest expense is due to lower debt outstanding in 2013 compared to 2012. In both periods, interest expense of approximately $0.5 million was allocated to discontinued operations as part of UPC, since we were required to repay debt with the sales proceeds. The foreign exchange gain in the three months ended June 30, 2013 is primarily related to movements in Euro/U.S. dollar exchange rates and the resulting impact on the revaluation of non-functional currency cash and debt balances. The larger gain in 2012 was due to the foreign exchange impact of larger Euro-denominated debt balances.

See Note 4(b) in our Unaudited Condensed Consolidated Financial Statements included in this Form 10Q for discussion on the loss on divestiture of Advanced Materials business.

We recorded income tax expense of $1.9 million on pre-tax income of $9.9 million for the three months ended June 30, 2013, resulting in an effective income tax rate of 18.7%. For the three months ended June 30, 2012, we recorded an income tax benefit of $5.3 million on pre-tax loss of $28.3 million, resulting in an effective income tax rate of 18.6%.  These rates are lower than the U.S. statutory tax rate primarily due to income earned in tax jurisdictions with lower statutory rates than the U.S. and a tax efficient financing structure, partially offset by losses in certain jurisdictions (including the U.S.) with no corresponding tax benefit.

Six Months Ended June 30, 2013 Compared with the Six Months Ended June 30, 2012

The following table identifies, by segment, the components of change in net sales and operating profit for the six months ended June 30, 2013, compared with the six months ended June 30, 2012:

(in thousands)	Net sales			Operating profit - as reported			Adjusted operating profit
2012	$	855,818		$	10,340		$	54,755
Change in 2013 from:
Magnetic Technologies	(92,501		)	23,755			(19,292		)
Battery Technologies	9,002			4,755			5,442
Specialty Chemicals	(7,549		)	(7,072		)	(3,081		)
Advanced Materials	(143,921		)	(10,669		)	(10,669		)
Corporate	—			2,173			2,173
Intersegment items	276			—			—
2013	$	621,125		$	23,282		$	29,328

Net sales decreased $234.7 million, or 27.4%, primarily due to lower sales in Magnetic Technologies driven by lower rare earth prices and lower volumes, the divestiture of the Advanced Materials business, and lower sales volumes in Specialty Chemicals, all partially offset by higher volumes in Battery Technologies.

Gross profit was relatively flat at $138.0 million, or 22.2% of sales, in the six months ended June 30, 2013, compared with $135.9 million, or 15.9% of sales, in the six months ended June 30, 2012. Gross margin percentage increased in 2013 due to the charges in 2012 for VAC purchase accounting step-up and LCM, offset by the positive impact of higher rare-earth pricing in 2012 .

Selling, general and administrative expenses (“SG&A”) decreased to $114.7 million in the six months ended June 30, 2013from $125.6 million in the six months ended June 30, 2012. SG&A as a percentage of net sales was 18.5% in the six months ended June 30, 2013compared with 14.7% in the six months ended June 30, 2012. SG&A was lower in 2013 due to the Advanced Materials divestiture, but was higher as a percentage of net sales due to the impact of lower sales in 2013.

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The following table summarizes the components of Other expense, net for the six months ended June 30:

(in thousands)	2013			2012			Change
Interest expense	$	(9,463	)	$	(22,733	)	$	13,270
Foreign exchange gain	164			898			(734		)
Loss on divestiture of Advanced Materials business	(112,061		)	—			(112,061		)
Other expense, net	(386		)	144			(530		)
	$	(121,746	)	$	(21,691	)	$	(100,055	)

The decrease in interest expense is due to lower debt outstanding in 2013 compared to 2012.

See Note 4(b) in the Unaudited Condensed Consolidated Financial Statements included in this Form 10-Q for discussion on the loss on the divestiture of the Advanced Materials business.

OM Group recorded income tax expense of $4.5 million on pre-tax loss of $98.5 million for the six months ended June 30, 2013, resulting in an effective income tax rate of negative 4.5%. For the six months ended June 30, 2012, the Company recorded income tax benefit of $0.3 million on pre-tax loss of $11.4 million, resulting in an effective income tax rate of 2.8%.  The rates in both six-month periods were impacted by special items: in 2013 by the loss on sale of the Advanced Materials divestiture and the charges related to cost reduction actions, and in 2012 by the inventory charges in Magnetic Technologies related to purchase accounting. Excluding these special items, the effective income tax rates for the six months ended June 30, 2013 and June 30, 2012 were 26.8% and 33.8%, respectively. These rates are lower than the U.S. statutory tax rate primarily due to income earned in tax jurisdictions with lower statutory rates than the U.S. and a tax efficient financing structure, partially offset by losses in certain jurisdictions (including the U.S.) with no corresponding tax benefit.

Segment Results and Corporate Expenses

Magnetic Technologies

The segment is focused on developing and leveraging its substantial patent portfolio to enter new markets and increase market share and on reducing its cost structure.

The primary raw materials used by Magnetic Technologies include the rare earth materials dysprosium and neodymium. During 2011, rare earth material prices spiked abnormally and declined steadily throughout 2012. Rare earth materialsare currently available from a limited number of suppliers, primarily in China. Supply of rare earth materials is expected to increase as additional sources outside of China become available.

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The following table identifies the components of change in net sales and operating profit (loss):

	Three Months Ended									Six Months Ended
	June 30,									June 30,
(in millions)	Net sales			Operating profit			Adjusted operating profit			Net sales			Operating profit			Adjusted operating profit
2012	$	168.0		$	(30.1	)	$	1.4		$	358.5		$	(16.2	)	$	31.0
Increase (decrease) in 2013 from:
Purchase accounting charges in 2012	—			31.5			—			—			47.2			—
LCM charges in 2012 (non-purchase accounting)	—			22.4			22.4			—			22.4			22.4
Volume/mix	(9.8		)	(5.3		)	(5.3		)	(17.7		)	(6.9		)	(6.9		)
Selling price	(0.8		)	(0.8		)	(0.8		)	(1.6		)	(1.6		)	(1.6		)
Rare earth pricing effects	(30.5		)	(16.1		)	(16.1		)	(76.0		)	(41.3		)	(41.3		)
Operating expenses, including savings from cost-reduction initiatives	—			1.5			1.5			—			5.1			5.1
Charges related to cost-reduction initiatives	—			(0.4		)	—			—			(4.3		)	—
Foreign currency	2.0			(0.6		)	(0.6		)	2.8			(0.5		)	(0.5		)
Other	—			(0.9		)	(0.9		)	—			3.6			3.6
2013	$	128.9		$	1.2		$	1.5		$	266.0		$	7.5		$	11.7

Charges related to cost-reduction initiatives in the second quarter and six months ended June 30, 2013 relate to the cost reduction actions previously described. Acquisition-related charges in the prior year periods represent inventory step-up charges resulting from purchase accounting for the VAC acquisition.

Net sales declined in the 2013 periods compared to the prior year periods due primarily to benefits in 2012 from rare earth prices. Net sales in the 2013 periods also were negatively impacted by lower sales volumes due primarily to economic weakness in European markets.

Operating profit was higher in the 2013 periods due to the negative impact in 2012 of purchase accounting and LCM charges, partially offset by rare-earth pricing benefits in 2012. Excluding these special items, operating profit was lower in the 2013 periods due to lower sales volumes due to economic weakness in European markets, partially offset by the positive impact of lower operating expense due in part to our cost reduction program.

Battery Technologies

The segment is focused on developing new battery chemistries and products, expanding its served markets and reducing its cost structure in response to the uncertainty of U.S. government spending.

The following table identifies the components of change in net sales and operating profit:

	Three Months Ended							Six Months Ended
	June 30,							June 30,
(in millions)	Net sales		Operating profit			Adjusted operating profit		Net sales		Operating profit			Adjusted operating profit
2012	$	35.2	$	6.1		$	6.1	$	72.2	$	11.7		$	11.7
Increase (decrease) in 2013 from:
Volume	5.0		1.6			1.6		8.1		2.4			2.4
Selling price/mix	—		0.5			0.5		0.9		1.3			1.3
Charges related to cost-reduction initiatives	—		(0.5		)	—		—		(0.7		)	—
Other	—		0.5			0.5		—		1.8			1.8
2013	$	40.2	$	8.2		$	8.7	$	81.2	$	16.5		$	17.2

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Charges related to cost-reduction initiatives in the three and six months ended June 30, 2013 relate to the cost reduction actions previously described.

Net sales and operating profit in the three and six months ended June 30, 2013 compared with the comparable periods of 2012 benefited from higher sales volumes, particularly into defense markets.

The Battery Technologies segment tracks backlog, which is equal to the value of unfulfilled orders for which funding is contractually obligated by the customer and for which revenue has not been recognized. At June 30, 2013, backlog was $132.1 million, compared to $128.0 million at December31, 2012. Of this amount, $66.8 million is expected to be converted to sales in 2013, with the remainder in future periods.

Specialty Chemicals

This segment is focused on organic growth through broadened product offerings, leveraging our formulations and technical application expertise, as well as through geographic expansion and market penetration.

The following table identifies the components of change in net sales and operating profit:

	Three Months Ended									Six Months Ended
	June 30,									June 30,
(in millions)	Net sales			Operating profit			Adjusted operating profit			Net sales			Operating profit			Adjusted operating profit
2012	$	84.8		$	9.7		$	9.7		$	168.3		$	22.3		$	19.4
Increase (decrease) in 2013 from:
Volume	(1.1		)	(1.0		)	(1.0		)	(6.5		)	(3.9		)	(3.9		)
Selling price/mix	(1.3		)	1.3			1.3			(2.5		)	1.7			1.7
Foreign currency	0.4			0.1			0.1			0.4			0.1			0.1
Charges related to cost-reduction initiatives	—			(1.1		)	—			—			(1.2		)	—
2012 gain on sale of land	—			—			—			—			(2.9		)	(2.9		)
Other	0.5			(0.8		)	(0.8		)	1.0			(0.9		)	(0.9		)
2013	$	83.4		$	8.2		$	9.3		$	160.7		$	15.2		$	16.3

Charges for cost-reduction initiatives in the three and six months ended June 30, 2013 relate to the cost reduction actions previously described. In the six months ended June 30, 2012, the Company sold land in China for a gain of $2.9 million.

Sales were almost flat in the second quarter of 2013 compared to 2012. Operating profit was down $1.5 million due primarily to charges related to cost reduction actions. The decrease in net sales and operating profit in the six months ended June 30, 2013 compared with the six months ended June 30, 2012 was primarily due to lower sales volumes, driven by weakness in the consumer electronics markets, as well as weak macroeconomic conditions impacting the coatings and additives markets.

Advanced Materials

As described above, we divested this business as of March 29, 2013. Activity in this segment beginning in the second quarter of 2013 represents performance under the transition agreements described above, which is expected to have minimal impact on the Company's operating profit and cash flows.

During 2012 and through the date of sale, this business manufactured inorganic products using unrefined cobalt and other metals, for the mobile energy storage, renewable energy, automotive systems, construction and mining, and industrial end markets. It also had a 55% interest in GTL.

25

For the three and six months ended June 30:

	Three Months Ended June 30,					Six Months Ended June 30,
(in millions)	2013			2012		2013		2012
Net sales	$	26.9		$	124.3	$	113.3	$	257.2
Operating profit	$	(0.4	)	$	0.9	$	1.4	$	12.0

Corporate Expenses

Corporate expenses are those expenses that support the operating segments but are not specifically allocated to an operating segment, including certain legal, finance, human resources and strategic development activities, as well as share-based compensation for the entire Company.

Corporate expenses were $7.9 million in the second quarter of 2013 as compared with $9.7 million in the second quarter of 2012. Corporate expenses were $17.3 million in the six months ended June 30, 2013 as compared with $19.5 million in the six months ended June 30, 2012. Corporate expenses were lower in the 2013 periods due to lower professional fees and lower incentive compensation expense.

Liquidity and Capital Resources

Cash Flow Summary

Our cash flows from operating, investing and financing activities, as reflected in the Unaudited Condensed Statements of Consolidated Cash Flows, are presented in the following table (in millions) and discussed in the related narrative:

	Six months ended
	June 30,
(in millions)	2013			2012
Net cash provided by (used for):
Operating activities	$	(6.8	)	$	63.1
Investing activities	344.1			(22.6		)
Financing activities	(480.2		)	(8.3		)
Effect of exchange rate changes on cash	(1.5		)	(3.8		)
Cash used by discontinued operations	$	(2.7	)	$	(3.0	)
Net change in cash and cash equivalents	$	(147.1	)	$	25.4

Operating Activities

In the first six months of 2013, cash outflow from operating activities was $6.8 million compared with a cash inflow of $63.1 million in the same period of the prior year. The cash flows from operating activities can fluctuate significantly from period-to-period due to profitability, working capital changes and the timing of payments for items such as income taxes, pensions and other items which impact reported cash flows. The amount in 2012 benefited from declining commodity prices in the Advanced Materials business.

Investing Activities

Net cash provided by investing activities in the first six months of 2013 included net proceeds of $365.4 million from the divestitures of the Advanced Materials and UPC businesses, less capital expenditures of $21.3 million primarily to expand capacity; to maintain and improve throughput; for compliance with environmental, health and safety regulations; and for other fixed asset additions at existing facilities. We expect to fund 2013 capital expenditures through cash generated from operations and cash on hand at June 30, 2013.

Financing Activities

The increase in cash used in financing activities as of June 30, 2013 compared to June 30, 2012 was primarily due to pre-payment of long-term debt from funds received when we divested our Advanced Materials and UPC businesses, additional pre-payment of long-term debt utilizing cash on hand and repurchases of common stock.

Financial Condition

Cash balances are held in numerous locations throughout the world. As of June 30, 2013, most of our cash and cash equivalents were held outside the United States, primarily in Germany and Taiwan, and most of our cash and cash

26

equivalents were denominated in U.S. dollars or Euros. Most of the amounts held outside the U.S. could be repatriated to the U.S. but, under current law, would be subject to U.S. income taxes, less applicable foreign tax credits. We intend to retain the majority of our cash balances outside of the U.S.

Debt and Other Financing Activities

Our obligations under the Senior Secured Credit Facility were repaid in the first six months of 2013. The Term A facility was repaid on May 31, 2013 with the proceeds from the divestiture of the UPC business as required and cash on hand. The Term B facilities were prepaid on March 29, 2013 with the proceeds from the divestiture of the Advanced Materials business and cash on hand, as required. The Senior Secured Credit Facility includes a $200 million undrawn revolving credit facility, which matures on August 2, 2016. See Note 5 in the Unaudited Condensed Consolidated Financial Statements included in this Form 10-Q for a more complete discussion of the Senior Secured Credit Facility.

Contractual Obligations

Since December 31, 2012, there have been no significant changes in the total amount of contractual obligations, or the timing of cash flows in accordance with those obligations, as reported in the Form 10-K for the year ended December 31, 2012, other than the repayment of the Senior Secured Credit Facility balance, discussed previously.

27

Critical Accounting Policies

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions in certain circumstances that affect amounts reported in the accompanying unaudited condensed consolidated financial statements. In preparing these financial statements, management has made its best estimates and judgments of certain amounts, giving due consideration to materiality. The application of accounting policies involves the exercise of judgment and use of assumptions as to future uncertainties and, as a result, actual results could differ from these estimates. In addition, other companies may utilize different estimates and assumptions, which may impact the comparability of our results of operations to similar businesses. There have been no changes to the critical accounting policies as stated in our Annual Report on Form 10-K for the year ended December 31, 2012.

Cautionary Statement for “Safe Harbor” Purposes under the Private Securities Litigation Reform Act of 1995

The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by or on behalf of the Company. This report contains statements that we believe may be “forward-looking statements” within the meaning of Section 21E of the Securities Exchange Act of 1934. These forward-looking statements are not historical facts and generally can be identified by use of statements that include words such as “believe,” “expect,” “anticipate,” “intend,” “plan,” “foresee” or other words or phrases of similar import. Similarly, statements that describe the our objectives, plans or goals also are forward-looking statements. These forward-looking statements are subject to risks and uncertainties that are difficult to predict, may be beyond our control and could cause actual results to differ materially from those currently anticipated. We undertake no obligation to publicly revise these forward-looking statements to reflect events or circumstances that arise after the date hereof. Significant factors affecting these expectations are set forth under Item 1A — Risk Factors in our Annual Report on Form 10-K for the year ended December 31, 2012.

Item 3.  Quantitative and Qualitative Disclosures about Market Risk

A discussion of market risk exposures is included in Part II, Item 7a. Quantitative and Qualitative Disclosure About Market Risk in our Annual Report on Form 10-K for the year ended December 31, 2012. There have been no material changes from the risk factors previously disclosed in the Company's Annual Report on Form 10-K for the year ended December 31, 2012 except as disclosed in Item 1A. Risk Factors in this form 10-Q.

28

Item 4.  Controls and Procedures

Evaluation of Disclosure Controls and Procedures

We have carried out an evaluation of the effectiveness of the design and operation of the Company’s disclosure controls and procedures as of June 30, 2013. As defined in Rule 13a-15(e) under the Exchange Act, disclosure controls and procedures are controls and procedures designed to provide reasonable assurance that information required to be disclosed in reports filed or submitted under the Exchange Act is recorded, processed, summarized and reported on a timely basis, and that such information is accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure. Our disclosure controls and procedures include components of the our internal control over financial reporting. Based upon this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that the Company’s disclosure controls and procedures were effective as of June 30, 2013.

Internal Control over Financial Reporting

Except for the controls implemented to remediate the material weakness in our internal control over financial reporting regarding the classification of SG&A expenses and Cost of goods sold of the VAC business, which comprises our Magnetic Technologies segment, there were no changes in the Company's internal control over financial reporting, identified in connection with management's evaluation of internal control over financial reporting, that occurred during the three months ended June 30, 2013 and materially affected, or are reasonably likely to materially affect, the Company's internal control over financial reporting.

PART II - OTHER INFORMATION

Item 1A. Risk Factors

There have been no material changes from the risk factors previously disclosed in the Company's Annual Report on Form 10-K for the year ended December 31, 2012 except that the risk factor captioned “On January 21, 2013 we announced the signing of definitive agreements to exit our Advanced Materials business, but the arrangements are subject to customary closing conditions, including regulatory approvals, which might prevent their successful completion” is no longer applicable because the Advanced Materials closing occurred. 

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

	Issuer Purchases of Equity Securities
Period	Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (2)	Maximum Approximate Dollar Value of Shares that May Yet Be Purchased under the Plans or Programs
April 1 - 30, 2013	363,600	$	23.56	363,600	$	36,444,562
May 1 - 31, 2013 (1)	22,605	23.46		22,500	35,916,904
June 1 - 30, 2013	—	—		—	35,916,904
Total April 1 - June 30, 2013	386,205	$	23.55	386,100	$	35,916,904

(1)  Includes 105 shares of common stock of the Company surrendered to us by employees to pay required taxes applicable to the vesting of restricted stock, in accordance with the applicable long-term incentive plan previously approved by our stockholders and shares repurchased as part of publicly announced plans or programs.

(2) On January 21, 2013, we announced that our Board of Directors had authorized a share repurchase plan of up to $50 million of the Company's then outstanding common shares. By June 30, 2013, we repurchased 588,600 shares under this plan.

29

Item 6.  Exhibits and Financial Statement Schedules

Exhibits are as follows:

31.1	Certification of Principal Executive Officer Pursuant to Rule 13a-14(a)
31.2	Certification of Principal Financial Officer Pursuant to Rule 13a-14(a)
32	Certification of Principal Executive Officer and Principal Financial Officer Pursuant to 18 U.S.C. 1350
101.1	Instance Document
101.2	Schema Document
101.3	Calculation Linkbase Document
101.4	Labels Linkbase Document
101.5	Presentation Linkbase Document
101.6	Definition Linkbase Document

30

Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

OM GROUP, INC.

Date: August 1, 2013	By:	/s/ Christopher M. Hix
		Christopher M. Hix
		Vice President and Chief Financial Officer
		(Principal Financial Officer and Duly Authorized Officer)

31

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Joseph Scaminace, certify that:

1. I have reviewed this report on Form 10-Q of OM Group, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of registrant's board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 1, 2013 /s/Joseph Scaminace Joseph Scaminace Chairman of the Board and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Christopher M. Hix, certify that:

1. I have reviewed this report on Form 10-Q of OM Group, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of registrant's board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 1, 2013 /s/Christopher M. Hix Christopher M. Hix Vice President and Chief Financial Officer

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO 18 U.S.C. SEC. 1350, AS ADOPTED PURSUANT TO

SEC. 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the filing with the Securities and Exchange Commission of the Quarterly Report on Form 10-Q of OM Group, Inc. (the "Company") for the quarter ended June 30, 2013 (the "Report"), each of the undersigned officers of the Company certifies, pursuant to 18 U.S.C. Sec. 1350, as adopted pursuant to Sec. 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: August 1, 2013	/s/Joseph Scaminace Joseph Scaminace Chairman of the Board and Chief Executive Officer
	/s/Christopher M. Hix Christopher M. Hix Vice President and Chief Financial Officer

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Common Stock Repurchases (Notes)

6 Months Ended

Jun. 30, 2013

Share Repurchase Program [Abstract]

Share Repurchase Program

Share Repurchase Program

On January 21, 2013, we announced that our Board of Directors had authorized the repurchase of up to $50 million of the Company's outstanding common shares through open market repurchases, negotiated block transactions or open market solicitation for shares. As of June 30, 2013, we repurchased 0.6 million of our common shares for total consideration of $14.1 million. These shares are accounted for as treasury shares and the purchases were funded from our available cash balances.

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Share-Based Compensation (Compensation Expense For Option Grants, Restricted Stock Awards And Restricted Stock Unit Awards) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1,453	$ 1,050	$ 2,920	$ 3,669
Stock Options and Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	1,402	1,282	2,738	3,558
Restricted Stock Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	51	(232)	182	111
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 113	$ 132	$ 238	$ 263

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Unaudited Condensed Statements of Consolidated Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Net sales	$ 279,388	$ 412,063	$ 621,125	$ 855,818
Cost of goods sold	215,608	372,278	483,117	719,924
Gross profit	63,780	39,785	138,008	135,894
Selling, general and administrative expenses	54,633	62,973	114,726	125,554
Operating profit	9,147	(23,188)	23,282	10,340
Other income (expense):
Interest expense	(1,818)	(11,177)	(9,463)	(22,733)
Foreign exchange gain (loss)	2,838	6,028	164	898
Loss on divestiture of Advanced Materials business	(515)	0	(112,061)	0
Other, net	272	81	(386)	144
Non operating income (expense), total	777	(5,068)	(121,746)	(21,691)
Income from continuing operations before income tax expense	9,924	(28,256)	(98,464)	(11,351)
Income tax expense	(1,856)	5,258	(4,455)	320
Income from continuing operations, net of tax	8,068	(22,998)	(102,919)	(11,031)
Loss from discontinued operations, net of tax	(11,394)	414	(11,870)	295
Consolidated net income	(3,326)	(22,584)	(114,789)	(10,736)
Net (income) loss attributable to the noncontrolling interests	0	245	1,749	346
Net income attributable to OM Group, Inc. common stockholders	(3,326)	(22,339)	(113,040)	(10,390)
Earnings per common share - basic:
Income from continuing operations attributable to OM Group, Inc. common stockholders (in dollars per share)	$ 0.26	$ (0.71)	$ (3.19)	$ (0.34)
Loss from discontinued operations attributable to OM Group, Inc. common stockholders (in dollars per share)	$ (0.37)	$ 0.01	$ (0.38)	$ 0.01
Net income (loss) attributable to OM Group, Inc. common stockholders (in dollars per share)	$ (0.11)	$ (0.70)	$ (3.57)	$ (0.33)
Earnings per common share - assuming dilution:
Income from continuing operations attributable to OM Group, Inc. common stockholders (in dollars per share)	$ 0.26	$ (0.71)	$ (3.19)	$ (0.34)
Loss from discontinued operations attributable to OM Group, Inc. common stockholders (in dollars per share)	$ (0.37)	$ 0.01	$ (0.38)	$ 0.01
Net income (loss) attributable to OM Group, Inc. common stockholders (in dollars per share)	$ (0.11)	$ (0.70)	$ (3.57)	$ (0.33)
Weighted average shares outstanding
Basic (in shares)	31,452	31,882	31,673	31,878
Assuming dilution (in shares)	31,621	31,882	31,673	31,878
Amounts attributable to OM Group, Inc. common shareholders:
Income from continuing operations, net of tax	8,068	(22,753)	(101,170)	(10,685)
Loss from discontinued operations, net of tax	(11,394)	414	(11,870)	295
Net income attributable to OM Group, Inc. common stockholders	$ (3,326)	$ (22,339)	$ (113,040)	$ (10,390)

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Inventories

6 Months Ended

Jun. 30, 2013

Inventory, Net [Abstract]

Inventories

Inventories

Inventories consist of the following:

	June 30,		December 31,
	2013		2012
Raw materials and supplies	$	79,468	$	133,864
Work-in-process	119,247		187,691
Finished goods	42,090		131,144
	$	240,805	$	452,699

On March 29, 2013, we completed the divestiture of our Advanced Materials business. Total Inventory in this segment as of December 31, 2012 was $193.7 million.

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Recently Issued Accounting Guidance Recently Issued Accounting Guidance (Policies)

6 Months Ended

Jun. 30, 2013

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Pronouncements

In July 2012, the FASB issued amendments to the intangible assets guidance which provides an option for companies to use a qualitative approach to test indefinite lived intangible assets for impairment if certain conditions are met. The amendments are effective for annual and interim indefinite lived intangible assets impairment tests performed for fiscal years beginning after September 15, 2012. We adopted this guidance on January 1, 2013 and we do not expect that such adoption will have any effect on our results of operations or financial position.

In February 2013, the FASB issued amendments to the comprehensive income guidance to improve the transparency of reporting reclassifications out of Accumulated Other Comprehensive Income (AOCI). The update requires companies to disclose items reclassified out of AOCI and into net income in a single location either in the notes to the consolidated financial statements or on the face of the Consolidated Statements of Operations. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2012. We adopted this guidance as of March 31, 2013 and elected to include the disclosure in the notes to the consolidated financial statements. Such adoption did not have any effect on our results of operations or financial position.

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Reportable Segments (Results of Reportable Segments) (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Net Sales
Net sales	$ 279,388,000		$ 412,063,000		$ 621,125,000		$ 855,818,000
Operating profit (loss)
Operating profit (Loss)	9,147,000		(23,188,000)		23,282,000		10,340,000
Interest expense	(1,818,000)		(11,177,000)		(9,463,000)		(22,733,000)
Foreign exchange gain (loss)	2,838,000		6,028,000		164,000		898,000
Loss on divestiture of Advance Materials business			0		(112,061,000)		0
Other expense, net	272,000		81,000		(386,000)		144,000
Non operating income (expense), total	777,000		(5,068,000)		(121,746,000)		(21,691,000)
Income from continuing operations before income tax expense	9,924,000		(28,256,000)		(98,464,000)		(11,351,000)
Expenditures for property, plant & equipment
Expenditures for property, plant and equipment	8,750,000		17,380,000		21,261,000		27,729,000
Depreciation and amortization
Depreciation and amortization	16,681,000		20,923,000		38,063,000		41,842,000
Gain (Loss) on Sale of Property							2,900,000
Magnetic Technologies [Member]
Net Sales
Net sales	128,864,000		168,024,000		266,014,000		358,515,000
Operating profit (loss)
Operating profit (Loss)	1,153,000	[1],[2]	(30,146,000)	[1],[2]	7,512,000	[1],[2]	(16,243,000)	[1],[2]
Expenditures for property, plant & equipment
Expenditures for property, plant and equipment	5,106,000		6,499,000		8,007,000		9,995,000
Depreciation and amortization
Depreciation and amortization	10,705,000		10,010,000		21,469,000		20,222,000
Cost Reductions Initiatives	400,000				4,200,000
Charges related to inventory purchase accounting			31,500,000				47,000,000
Battery Technologies [Member]
Net Sales
Net sales	40,205,000		35,205,000		81,239,000		72,237,000
Operating profit (loss)
Operating profit (Loss)	8,155,000	[1]	6,063,000	[1]	16,473,000	[1]	11,718,000	[1]
Expenditures for property, plant & equipment
Expenditures for property, plant and equipment	848,000		1,002,000		1,901,000		2,223,000
Depreciation and amortization
Depreciation and amortization	2,531,000		2,509,000		5,033,000		5,011,000
Cost Reductions Initiatives	500,000				700,000
Specialty Chemicals [Member]
Net Sales
Net sales	83,444,000	[3]	84,810,000	[3]	160,749,000	[3]	168,298,000	[3]
Operating profit (loss)
Operating profit (Loss)	8,167,000	[1],[3],[4]	9,670,000	[1],[3],[4]	15,212,000	[1],[3],[4]	22,284,000	[1],[3],[4]
Expenditures for property, plant & equipment
Expenditures for property, plant and equipment	2,796,000	[3]	1,319,000	[3]	5,013,000	[3]	1,814,000	[3]
Depreciation and amortization
Depreciation and amortization	3,647,000	[3]	3,986,000	[3]	7,498,000	[3]	7,852,000	[3]
Cost Reductions Initiatives	1,100,000				1,100,000
Advanced Materials [Member]
Net Sales
Net sales	26,875,000		124,261,000		113,313,000		257,234,000
Operating profit (loss)
Operating profit (Loss)	(381,000)		923,000		1,365,000		12,034,000
Expenditures for property, plant & equipment
Expenditures for property, plant and equipment	0		8,560,000		6,340,000		13,697,000
Depreciation and amortization
Depreciation and amortization	(333,000)		4,271,000		3,871,000		8,495,000
Corporate [Member]
Operating profit (loss)
Operating profit (Loss)	(7,947,000)		(9,698,000)		(17,280,000)		(19,453,000)
Depreciation and amortization
Depreciation and amortization	131,000		147,000		192,000		262,000
Intersegment items [Member]
Net Sales
Net sales	$ 0		$ (237,000)		$ (190,000)		$ (466,000)

[1] The three and six months ended June 30, 2013 include costs related to cost reduction initiatives of $0.4 million and $4.2 million in Magnetic Technologies, $0.5 million and $0.7 million in Battery Technologies, and $1.1 million and

[2] includes inventory step-up and LCM charges of $31.5 million and $47.3 million, respectively, resulting from purchase accounting for the VAC acquisition.

[3] All results related to the UPC business are excluded from the Special Chemicals segment for all periods presented.

[4] The six months ended June 30, 2012 includes a $2.9 million property sale gain.

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Accumulated Other Comprehensive Income (Loss) (Notes)

6 Months Ended

Jun. 30, 2013

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

(a) Changes in Accumulated Comprehensive Income (Loss) by Component

	Foreign Currency Translation Loss			Unrealized Gains and Losses on Cash Flow Hedging Derivatives			Pension and Post-Retirement Obligation			Accumulated Other Comprehensive Income (Loss)
Beginning Balance at January 1, 2013	$	(21,299	)	$	(84	)	$	(66,622	)	$	(88,005	)
Other comprehensive income (loss) before reclassifications	(20,948		)	(184		)	593			(20,539		)
Amounts reclassified from accumulated other comprehensive (income) loss	13,513			60			—			13,573
Net current-period other comprehensive income (loss)	(7,435		)	(124		)	593			(6,966		)
Ending balance at June 30, 2013	$	(28,734	)	$	(208	)	$	(66,029	)	$	(94,971	)

(b) Reclassifications out of Accumulated Other Comprehensive Income (loss)

Details about Accumulated Other Comprehensive Income (loss) Components	Amount Reclassified from Accumulated Other Comprehensive Income (loss)			Affected Line Item in the Statement Where Net Income is Presented
Foreign currency translation	$	(135	)	Foreign exchange gain/(loss)
	(4,540		)	Loss on divestiture of Advanced Materials business
	(8,838		)	Loss from discontinued operations, net of tax
	$	(13,513	)	Total before tax
	—			Tax (expense) or benefit
	$	(13,513	)	Net of Tax
Unrealized gains and losses on cash flow hedging derivatives	(60		)	Interest expense

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Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance at January 1, 2013			$ (88,005)
Other comprehensive income (loss) before reclassifications			(20,539)
Amounts reclassified from accumulated other comprehensive (income) loss			13,573
Net change in accumulated other comprehensive income (loss)	18,275	(45,747)	(6,966)	(13,304)
Ending balance at June 30, 2013	(94,971)		(94,971)
Foreign exchange gain (loss)	2,838	6,028	164	898
Loss on divestiture of Advanced Materials business	(515)	0	(112,061)	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Reclassification Adjustment to Discontinued Operations	(8,838)	0	(8,838)	0
Income from continuing operations, net of tax	8,068	(22,998)	(102,919)	(11,031)
Tax (expense) or benefit	1,856	(5,258)	4,455	(320)
Net income attributable to OM Group, Inc. common stockholders	(3,326)	(22,339)	(113,040)	(10,390)
Foreign Currency Translation Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance at January 1, 2013			(21,299)
Other comprehensive income (loss) before reclassifications			(20,948)
Amounts reclassified from accumulated other comprehensive (income) loss			13,513
Net change in accumulated other comprehensive income (loss)			(7,435)
Ending balance at June 30, 2013	(28,734)		(28,734)
Unrealized Gains and Losses on Cash Flow Hedging Derivatives
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance at January 1, 2013			(84)
Other comprehensive income (loss) before reclassifications			(184)
Amounts reclassified from accumulated other comprehensive (income) loss			60
Net change in accumulated other comprehensive income (loss)			(124)
Ending balance at June 30, 2013	(208)		(208)
Pension and Post-Retirement Obligation
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance at January 1, 2013			(66,622)
Other comprehensive income (loss) before reclassifications			593
Amounts reclassified from accumulated other comprehensive (income) loss			0
Net change in accumulated other comprehensive income (loss)			593
Ending balance at June 30, 2013	(66,029)		(66,029)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Reclassification Adjustment to Discontinued Operations			(8,838)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Loss on Divestiture [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Loss on divestiture of Advanced Materials business			(4,540)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign Currency Translation Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Foreign exchange gain (loss)			(135)
Income from continuing operations, net of tax			(13,513)
Tax (expense) or benefit			0
Net income attributable to OM Group, Inc. common stockholders			(13,513)
Unrealized gains and losses on cash flow hedging derivatives			$ (60)

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Acquisitions/Divestiture Acquisitions/Divestiture (Net Assets and Liabilities of Our Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term liabilities	$ 0	$ 4,733
Ultra Pure Chemicals [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable		20,341
Inventories		10,393
Other current assets		2,392
Property, plant and equipment, net		22,408
Other long term assets		15,838
Goodwill		14,957
Total assets of discontinued operations (excluding cash)		86,329
Accounts payable		15,627
Other current liabilities		5,099
Long-term liabilities		4,733
Total liabilities of discontinued operations		$ 25,459

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Fair Value Disclosures (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]

Assets And Liabilities Accounted For At Fair Value On A Recurring Basis

The following table shows our assets and liabilities accounted for at fair value on a recurring basis:

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
Description	June 30, 2013		(Level 1)		(Level 2)		(Level 3)
Liabilities:
Nickel forward derivatives	$	301	$	—	$	301	$	—
Contingent consideration payable	12,991		—		—		12,991
Total	$	13,292	$	—	$	301	$	12,991

Changes in Level 3 liabilities measured at fair value on a recurring basis

The following table summarizes changes in Level 3 liabilities measured at fair value on a recurring basis:

		Contingent Consideration
Fair Value at	December 31, 2012	$	12,411
Accretion expense		784
Foreign exchange		(204		)
Fair Value at	June 30, 2013	$	12,991

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Acquisitions/Divestiture Acquisitions/Divestiture (Tables)

6 Months Ended

Jun. 30, 2013

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures

A summary of our discontinued operations impact is as follows:

	Three Months Ended June 30					Six Months Ended June 30
	2013			2012		2013			2012
(in thousands)
Net Sales	$	16,004		$	24,405	$	38,520		$	46,828
(Loss) Income from operations of divested business (net of tax)	$	(1,583	)	$	414	$	(2,059	)	$	295
Loss on disposal of business (net of tax)	(9,811		)	—		(9,811		)	—
(Loss) Income from discontinued operations (net of tax)	$	(11,394	)	$	414	$	(11,870	)	$	295
(Loss) Income per share from discontinued operations (net of tax)
Basic	$	(0.37	)	$	0.01	$	(0.38	)	$	0.01
Diluted	$	(0.37	)	$	0.01	$	(0.38	)	$	0.01

Details related to the net assets (excluding cash) and liabilities of our discontinued operations at December 31, 2012 are as follows:

	December 31, 2012
(in thousands)
Accounts receivable	$	20,341
Inventories	10,393
Other current assets	2,392
Property, plant and equipment, net	22,408
Other long term assets	15,838
Goodwill	14,957
Total assets of discontinued operations (excluding cash)	$	86,329
Accounts payable	$	15,627
Other current liabilities	5,099
Long-term liabilities	4,733
Total liabilities of discontinued operations	$	25,459

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Defined Benefit Plans (Schedule of Net Benefit Costs and Amounts Recognized in Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 296	$ 258	$ 591	$ 544
Interest cost	2,114	2,762	4,229	5,056
Amortization of unrecognized net loss	211	218	423	419
Expected return on plan assets	(2,731)	(2,623)	(5,245)	(5,236)
Net periodic benefit cost	(110)	615	(2)	783
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,172	939	2,357	1,899
Interest cost	1,461	1,855	2,938	3,750
Amortization of unrecognized net loss	263	0	529	0
Net periodic benefit cost	$ 2,896	$ 2,794	$ 5,824	$ 5,649

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Basis of Presentation (Narrative) (Details)	Jun. 30, 2013
Accounting Policies [Abstract]
Percentage of interest in joint venture by the company	55.00%
Noncontrolling interest in joint venture	45.00%

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Debt (Details)			3 Months Ended		3 Months Ended		3 Months Ended
	Jun. 30, 2012	Aug. 02, 2011 Term A Facility [Member] USD ($)	Mar. 31, 2013 Dollar Term B Facility [Member] USD ($)	Aug. 02, 2011 Dollar Term B Facility [Member] USD ($)	Mar. 31, 2013 Euro Term B Facility [Member] USD ($)	Aug. 02, 2011 Euro Term B Facility [Member] EUR (€)	Jun. 30, 2013 Term A Facility [Member] USD ($)	Aug. 02, 2011 Revolving Credit Facility [Member] USD ($)	Aug. 02, 2011 Revolving Credit Facility Denominated In Euros [Member] USD ($)	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]
Line of Credit Facility [Line Items]
Senior secured credit facility		$ 100,000,000		$ 350,000,000		€ 175,000,000
Undrawn revolving credit facility								200,000,000	100,000,000
Line of Credit Facility, Decrease, Repayments			345,600,000		27,200,000		92,500,000
Weighted average interest rate for the outstanding borrowings	5.66%
Write off of Deferred Debt Issuance Cost					$ 10,300,000		$ 1,500,000
Debt Instrument, Basis Spread on Variable Rate										2.75%	3.75%

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Earnings Per Share (Computation Of Basic And Diluted Income Per Common Share From Continuing Operations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Income (loss) from continuing operations attributable to OM Group, Inc. common stockholders	$ 8,068	$ (22,753)	$ (101,170)	$ (10,685)
Earnings per common share:
Income (loss) from continuing operations attributable to OM Group, Inc. common stockholders - basic (in dollars per share)	$ 0.26	$ (0.71)	$ (3.19)	$ (0.34)
Income (loss) from continuing operations attributable to OM Group, Inc. common stockholders - assuming dilution (in dollars per share)	$ 0.26	$ (0.71)	$ (3.19)	$ (0.34)
Weighted average shares outstanding - basic (in shares)	31,452	31,882	31,673	31,878
Dilutive effect of stock options and restricted stock	169	0	0	0
Weighted average shares outstanding - assuming dilution (in shares)	31,621	31,882	31,673	31,878

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Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Computation Of Basic And Diluted Income Per Common Share From Continuing Operations

The following table sets forth the computation of basic and dilutive income (loss) per common share from continuing operations attributable to OM Group, Inc. common stockholders:

	Three Months Ended June 30					Six Months Ended June 30
Amounts attributable to OM Group, Inc. common stockholders:	2013		2012			2013			2012
(in thousands, except per share amounts)
Income (loss) from continuing operations, net of tax	$	8,068	$	(22,753	)	$	(101,170	)	$	(10,685	)
Earnings (loss) per common share - basic:
Income (loss) from continuing operations	$	0.26	$	(0.71	)	$	(3.19	)	$	(0.34	)
Earnings (loss) per common share - assuming dilution:
Income (loss) from continuing operations	$	0.26	$	(0.71	)	$	(3.19	)	$	(0.34	)
Weighted average shares outstanding — basic	31,452		31,882			31,673			31,878
Dilutive effect of stock options and restricted stock	169		—			—			—
Weighted average shares outstanding — assuming dilution	31,621		31,882			31,673			31,878

Computation Of Basic And Diluted Net Income Per Common Share

The following table sets forth the computation of basic and diluted net income (loss) per common share attributable to OM Group, Inc. common stockholders:

	Three Months Ended June 30						Six Months Ended June 30
Amounts attributable to OM Group, Inc. common stockholders:	2013			2012			2013			2012
(in thousands, except per share amounts)
Net income (loss)	$	(3,326	)	$	(22,339	)	$	(113,040	)	$	(10,390	)
Earnings (loss) per common share - basic:
Net income (loss)	$	(0.11	)	$	(0.70	)	$	(3.57	)	$	(0.33	)
Earnings per common share - assuming dilution:
Net income (loss)	$	(0.11	)	$	(0.70	)	$	(3.57	)	$	(0.33	)
Weighted average shares outstanding — basic	31,452			31,882			31,673			31,878
Dilutive effect of stock options and restricted stock	169			—			—			—
Weighted average shares outstanding — assuming dilution	31,621			31,882			31,673			31,878

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Fair Value Disclosures (Changes in Level 3 liabilities measured at fair value on a recurring basis) (Details) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value at December 31, 2012	$ 12,991	$ 12,411
Accretion expense			784
Foreign exchange			(204)
Fair Value at March 31, 2013	$ 12,991	$ 12,411

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Inventories (Tables)

6 Months Ended

Jun. 30, 2013

Inventory, Net [Abstract]

Inventories

Inventories consist of the following:

	June 30,		December 31,
	2013		2012
Raw materials and supplies	$	79,468	$	133,864
Work-in-process	119,247		187,691
Finished goods	42,090		131,144
	$	240,805	$	452,699

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Unaudited Condensed Statements of Consolidated Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 UPC Business [Member]	Jun. 30, 2012 UPC Business [Member]
Operating activities
Consolidated net income	$ (114,789)	$ (10,736)
Adjustments to reconcile consolidated net income to net cash provided by (used for) operating activities:
Loss from discontinued operations	11,870	(295)
Depreciation and amortization	38,063	41,842
Amortization of deferred financing fees	2,000	2,748
Share-based compensation expense	3,158	3,932
Acquisition Related Inventory Charges	0	53,751
Loss on divestiture of Advanced Materials business	112,061	0
Foreign exchange (gain) loss	(164)	(898)
Other non-cash items	5,649	(19,788)
Changes in operating assets and liabilities, excluding the effect of business acquisitions
Accounts receivable	(34,666)	(14,249)
Inventories (includes $15.9 million of step up amortization in 2012)	16,809	76,125
Accounts payable	1,613	(60,705)
Increase (Decrease) in Accrued Taxes Payable	(23,872)	264
Other, net	(24,691)	(9,776)
Net cash (used for) provided by operating activities	(6,795)	63,113
Investing activities
Expenditures for property, plant and equipment	(21,261)	(27,729)
Net proceeds from divestiture			63,300	0
Proceeds from sale of property	0	5,138
Net cash provided by (used for) investing activities	344,125	(22,591)
Financing activities
Payments on long-term debt	(466,538)	(8,027)
Payment related to surrendered shares	(14,083)	0
Proceeds from exercise of stock options	1,005	0
Payments Related to Surrendered Shares	554	254
Net cash used for financing activities	(480,170)	(8,281)
Effect of exchange rate changes on cash	(1,503)	(3,808)
Cash and cash equivalents
Increase (decrease) in cash and cash equivalents	(144,343)	28,433
Discontinued operations - net cash used by operating activities	(282)	(1,620)
Discontinued operations - net cash used for investing activities	(2,419)	(1,398)
Balance at the beginning of the period	227,612	292,146
Balance at the end of the period	$ 80,568	$ 317,561

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Basis of Presentation

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

OM Group, Inc. ("OM Group", the “Company”, “we”, “our”, “us”) is a technology-based industrial growth company serving attractive global markets, including automotive systems, electronic devices, aerospace, industrial and renewable energy. We use innovative technologies to address customers' complex applications and demanding requirements. Our strategy is to grow organically through product innovation and new market and customer development; to grow strategically through synergistic acquisitions; and to maximize total stockholder return through a combination of business growth, financial discipline, optimal deployment of capital and continued operational excellence. Our objective is to deliver sustainable, profitable growth and create long-term stockholder value.

The consolidated financial statements include the accounts of OM Group and its consolidated subsidiaries. We were formed in 1991 as a Delaware Corporation. Intercompany accounts and transactions have been eliminated in consolidation. Until March 29, 2013, we held a 55% interest in a joint venture (“GTL”) that had a smelter in the Democratic Republic of Congo (the “DRC”). The joint venture was consolidated because we had a controlling interest in the joint venture. Noncontrolling interest was recorded for the remaining 45% interest. Our joint venture interests were transferred to the joint venture partners on March 29, 2013 as part of the divestiture of our Advanced Materials business.

On May 31, 2013 we completed the sale of our Ultra Pure Chemicals business. The results of our Ultra Pure Chemicals business are reported as discontinued operations in the accompanying unaudited condensed consolidated financial statements for all periods presented. See note 4 - Acquisitions and Divestitures.

These financial statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and the instructions to Form 10-Q and do not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of the financial position of the Company at June 30, 2013 and the results of its income (loss), comprehensive income (loss) and cash flows for the six months ended June 30, 2013 and 2012 have been included. The balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date but does not include all of the information or notes required by U.S. generally accepted accounting principles for complete financial statements. Past operating results are not necessarily indicative of the results which may occur in future periods, and the interim period results are not necessarily indicative of the results to be expected for the full year. These Unaudited Condensed Consolidated Financial Statements should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2012.

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Acquisitions

6 Months Ended

Jun. 30, 2013

Business Combinations [Abstract]

Acquisitions

Acquisitions and Divestitures

(a) Acquisitions

VAC

On August 2, 2011, we acquired the equity interest in VAC Holding GmbH ("VAC") and the financial position, results of operations and cash flows of VAC are included in the Consolidated Financial Statements from that date. VAC is engaged in the development, manufacturing and distribution of high-performance industrial-use magnetic materials and related products and systems with exceptional magnetic and/or physical properties for a wide array of end markets, including automotive systems, energy conversion and distribution, electrical installation technology, industrial automation, aerospace and renewable energy. Our Magnetic Technologies segment consists of VAC.

The total purchase price of $812.2 million included cash consideration of $686.2 million, withheld consideration of $86.3 million, and the issuance of Company shares valued at $39.7 million. The withheld consideration relates to potential indemnification claims made by OM Group and accepted by the seller, if any, within two years of the closing date of the acquisition with certain exceptions related to tax matters. Two years after the acquisition, an escrow payment is due to the seller of VAC for which we currently have $75 million recorded. We financed the purchase with borrowings under a new senior secured credit facility (the “Senior Secured Credit Facility”) and cash on hand.

(b) Divestitures

Advanced Materials

On March 29, 2013, we completed the divestiture of our cobalt-based business. The transaction comprised the sale of the downstream portion of the business (including its cobalt refinery assets in Kokkola, Finland), and the transfer of equity interests in the DRC-based joint venture known as GTL to the joint venture partners, subject to a security interest in favor of OM Group with respect to the joint venture's performance related to certain supply arrangements.

In connection with this transaction we received cash proceeds of $329 million. At closing net proceeds of $302 million were received that consisted of the agreed purchase price of $325 million less excess cash on hand at closing of $19 million included in the net assets transferred and a transfer tax withheld of $4 million. We received additional proceeds of $27 million as an adjustment to the purchase price based on a post-closing analysis of the closing balance sheet in July 2013.

Including the adjustment to the purchase price, a loss of $112 million was recorded on the divestiture, which included a $10 million write-off of deferred financing fees related to the required debt pre-payment, a reserve for a note receivable from joint venture partner of $16 million and transaction expenses of $9 million.

The sale agreement for the downstream portion of the business also provides for potential future additional cash consideration of up to $110 million based on the business achieving certain revenue targets over a period of three years. Using our projected trends of cobalt prices and volumes, we do not believe it is probable that the business will meet the revenue targets, and no value was assigned to the potential future cash consideration while calculating the loss on the divestiture.

Following the sale, to assist in the transition of the downstream business, we entered into two agreements with the buyer pursuant to which: (1) we act as intermediary in a supply agreement between GTL and the buyer, in back-to-back arrangements for a period of at least two years, subject to delivery of 7000 MT of cobalt feed and extendable for up to an additional six months in order to deliver 7000 MT of cobalt feed; and, (2) we continue to serve as the U.S. distributor for refined cobalt products in primarily back-to-back arrangements for a period of up to one year after the closing. These agreements are expected to result in minimal statement of operations or cash flow impact for us and will be reported in the Advanced Materials segment until the agreements expire.

Ultra Pure Chemicals

On May 31, 2013, we completed the sale of our Ultra Pure Chemicals (UPC) business. In connection with this transaction we received cash proceeds of $63 million, which included an estimated $3 million working capital adjustment. A loss, net of tax, of $9.8 million was recorded on the divestiture, which included a gain of $1.5 million on the sale of net assets offset by the realization of a loss in accumulated other comprehensive income of $8.8 million, a $1.5 million write-off of deferred financing fees related to the required debt pre-payment and transaction expenses of $1 million.

The results of our UPC business are reported in discontinued operations in the accompanying unaudited condensed consolidated financial statements for all periods presented.  As required, annual interest expense of $2.5 million related to the debt repaid with the proceeds from the sale of the business was allocated to discontinued operations.

A summary of our discontinued operations impact is as follows:

	Three Months Ended June 30					Six Months Ended June 30
	2013			2012		2013			2012
(in thousands)
Net Sales	$	16,004		$	24,405	$	38,520		$	46,828
(Loss) Income from operations of divested business (net of tax)	$	(1,583	)	$	414	$	(2,059	)	$	295
Loss on disposal of business (net of tax)	(9,811		)	—		(9,811		)	—
(Loss) Income from discontinued operations (net of tax)	$	(11,394	)	$	414	$	(11,870	)	$	295
(Loss) Income per share from discontinued operations (net of tax)
Basic	$	(0.37	)	$	0.01	$	(0.38	)	$	0.01
Diluted	$	(0.37	)	$	0.01	$	(0.38	)	$	0.01

Details related to the net assets (excluding cash) and liabilities of our discontinued operations at December 31, 2012 are as follows:

	December 31, 2012
(in thousands)
Accounts receivable	$	20,341
Inventories	10,393
Other current assets	2,392
Property, plant and equipment, net	22,408
Other long term assets	15,838
Goodwill	14,957
Total assets of discontinued operations (excluding cash)	$	86,329
Accounts payable	$	15,627
Other current liabilities	5,099
Long-term liabilities	4,733
Total liabilities of discontinued operations	$	25,459

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Recently Issued Accounting Guidance

6 Months Ended

Jun. 30, 2013

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recently Issued Accounting Guidance

Recently Issued Accounting Guidance

Accounting Guidance adopted in 2013

In July 2012, the FASB issued amendments to the intangible assets guidance which provides an option for companies to use a qualitative approach to test indefinite lived intangible assets for impairment if certain conditions are met. The amendments are effective for annual and interim indefinite lived intangible assets impairment tests performed for fiscal years beginning after September 15, 2012. We adopted this guidance on January 1, 2013 and we do not expect that such adoption will have any effect on our results of operations or financial position.

In February 2013, the FASB issued amendments to the comprehensive income guidance to improve the transparency of reporting reclassifications out of Accumulated Other Comprehensive Income (AOCI). The update requires companies to disclose items reclassified out of AOCI and into net income in a single location either in the notes to the consolidated financial statements or on the face of the Consolidated Statements of Operations. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2012. We adopted this guidance as of March 31, 2013 and elected to include the disclosure in the notes to the consolidated financial statements. Such adoption did not have any effect on our results of operations or financial position.

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Derivative Instruments (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Derivatives, Fair Value [Line Items]
Derivative liability		$ 3,600,000
Hedge ineffectiveness recorded to income	0
Cash Flow Hedge Derivative Instrument Assets at Fair Value	300,000
Euro Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount of derivatives		45,000,000
Cash flow hedges expected to be reclassified to earnings		2,700,000
Interest Rate Swap Agreements [Member]
Derivatives, Fair Value [Line Items]
Notional amount of derivatives		198,500,000
Hedge ineffectiveness recorded to income	$ 0	$ 0

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Income Taxes (Tables)

6 Months Ended

Jun. 30, 2013

Income Tax Disclosure [Abstract]

Income (Loss) From Continuing Operations Before Income Tax Expense

	Three Months Ended June 30						Six Months Ended June 30
	2013			2012			2013			2012
United States	$	189		$	(1,567	)	$	(3,686	)	$	(2,018	)
Outside the United States	9,735			(26,689		)	(94,778		)	(9,333		)
Income (loss) from continuing operations before income tax expense	$	9,924		$	(28,256	)	$	(98,464	)	$	(11,351	)
Effective Income Tax Rate	18.7		%	18.6		%	(4.5		)%	2.8		%

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Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

Share-based Compensation [Abstract]

Share-Based Compensation Expense For Option Grants, Restricted Stock Awards And Restricted Stock Unit Awards

Set forth below is a summary of share-based compensation expense for option grants, restricted stock awards and restricted stock unit awards included as a component of Selling, general and administrative expenses in the Unaudited Condensed Statements of Consolidated Income (in thousands):

	Three Months Ended June 30					Six Months Ended June 30
	2013		2012			2013		2012
Stock options and restricted stock awards	$	1,402	$	1,282		$	2,738	$	3,558
Restricted stock unit awards	51		(232		)	182		111
Share-based compensation expense - employees	$	1,453	$	1,050		$	2,920	$	3,669
Share-based compensation expense - non-employee directors	$	113	$	132		$	238	$	263

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Acquisitions/Divestiture (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended				0 Months Ended	6 Months Ended		0 Months Ended		0 Months Ended	3 Months Ended		6 Months Ended		1 Months Ended
	Mar. 29, 2013 T	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 VAC [Member]	Aug. 02, 2011 VAC [Member]	Mar. 29, 2013 Advanced Materials [Member]	Jun. 30, 2013 Advanced Materials [Member]	Jun. 30, 2012 Advanced Materials [Member]	Mar. 29, 2013 Advanced Materials [Member] Minimum [Member]	Mar. 29, 2013 Advanced Materials [Member] Maximum [Member]	May 31, 2013 Ultra Pure Chemicals [Member]	Jun. 30, 2013 Ultra Pure Chemicals [Member]	Jun. 30, 2012 Ultra Pure Chemicals [Member]	Jun. 30, 2013 Ultra Pure Chemicals [Member]	Jun. 30, 2012 Ultra Pure Chemicals [Member]	Jul. 31, 2013 Subsequent Event [Member] Advanced Materials [Member]
Business Acquisition [Line Items]
Cobalt Feed Supply Agreement, Quantity	7,000
Purchase price total cash consideration							$ 812,200,000
Cash consideration paid for business acquisition							686,200,000
Purchase price of VAC Holding payable to seller							86,300,000
Shares issued in connection with acquisition of VAC Holding							39,700,000
Contigent considertion amounts based on certain volume targets						75,000,000
Agreed Upon Proceeds From Divestiture From Business Subject To Close									329,000,000
Net proceeds from divestiture of Advanced Materials Business								302,000,000	302,086,000	0
Net proceeds from divestiture of Advanced Materials business								325,000,000					63,000,000					27,000,000
Cash Divested from Deconsolidation								19,000,000
Transfer taxes paid								4,000,000
Loss on divestiture of Advanced Materials business		(515,000)	0	(112,061,000)	0				(112,000,000)
Disposal Group, Potential Earn-Out Income												110,000,000
Disposal Group, Potential Earn-Out Payment Period								3 years
Supply Agreement Period											2 years
Supply Agreement Extension Period								6 months
Cobalt Distributer Agreement Period								1 year
Working capital adjustment													3,000,000
Loss divestiture			0	(112,061,000)	0								10,000,000	(9,811,000)	0	(9,811,000)	0
Disposal Group, Including Discontinued Operations, Gain on Sale of Net Assets													2,000,000
Disposal Group, Including Discontinued Operations, Loss in Accumulated Other Comprehensive Income														8,800,000
Reclassification of foreign currency translation adjustment related to discontinued operations into earnings		8,838,000	0	8,838,000	0
Write-off of deferred financing fees									10,000,000				1,500,000
Disposal Group, Including Discontinued Operation, Provision for Doubtful Accounts									16,000,000
Disposal Group, Including Discontinued Operation, Transaction Expense									9,000,000				1,000,000
Discontinued Operations, Interest Expense, Debt Repaid by Proceeds From Divestiture of Business													$ 2,500,000

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Commitments and Contingencies (Details)			1 Months Ended
	Jun. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)	Oct. 31, 2010 GTL Injunction - Marange [Member] GBP (£)	Mar. 31, 2009 GTL Injunction - FG Hemisphere [Member] USD ($)
Site Contingency [Line Items]
Amounts under injunction			£ 14,500,000	$ 108,300,000
Amount of Arbitration Awards accrued	$ 0	$ 22,793,000

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Earnings Per Share (Computation Of Basic And Diluted Net Income Per Common Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Net income (loss) attributable to OM Group, Inc. common stockholders	$ (3,326)	$ (22,339)	$ (113,040)	$ (10,390)
Earnings per common share:
Net income (loss) attributable to OM Group, Inc. common stockholders - basic (in dollars per share)	$ (0.11)	$ (0.70)	$ (3.57)	$ (0.33)
Net income (loss) attributable to OM Group, Inc. common stockholders - assuming dilution (in dollars per share)	$ (0.11)	$ (0.70)	$ (3.57)	$ (0.33)
Weighted average shares outstanding - basic (in shares)	31,452	31,882	31,673	31,878
Dilutive effect of stock options and restricted stock	169	0	0	0
Weighted average shares outstanding - assuming dilution (in shares)	31,621	31,882	31,673	31,878

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Defined Benefit Plans (Narrative) (Details) (VAC [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
VAC [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension liabilities	$ 238.7	$ 242.5

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Unaudited Condensed Consolidated Balance Sheets Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 4,339	$ 5,215
Preferred Stock, Par or Stated Value Per Share (in usd per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized (in shares)	2,000,000	2,000,000
Preferred Stock, Shares Issued (in shares)	0	0
Preferred Stock, Shares Outstanding (in shares)	0	0
Common Stock, Par or Stated Value Per Share (in usd per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized (in shares)	90,000,000	90,000,000
Common Stock, Shares, Issued (in shares)	32,813,555	32,108,212
Treasury Stock, Shares (in shares)	825,956	216,695

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Fair Value Disclosures

6 Months Ended

Jun. 30, 2013

Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]

Fair Value Disclosures

Fair Value Disclosures

The following table shows our assets and liabilities accounted for at fair value on a recurring basis:

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
Description	June 30, 2013		(Level 1)		(Level 2)		(Level 3)
Liabilities:
Nickel forward derivatives	$	301	$	—	$	301	$	—
Contingent consideration payable	12,991		—		—		12,991
Total	$	13,292	$	—	$	301	$	12,991

The fair value of the derivative instruments have been determined based on the market equivalents at the balance sheet date, taking into account current commodity forward rates, therefore, they are classified within Level 2 of the valuation hierarchy. Our valuation techniques and Level 3 inputs used to estimate the fair value of the contingent consideration payable in connection with our acquisition of Rahu Catalytics Limited ("Rahu") are described below. There were no transfers into or out of Levels 1, 2 or 3 in 2013.

The following table summarizes changes in Level 3 liabilities measured at fair value on a recurring basis:

		Contingent Consideration
Fair Value at	December 31, 2012	$	12,411
Accretion expense		784
Foreign exchange		(204		)
Fair Value at	June 30, 2013	$	12,991

We acquired Rahu on December 22, 2011. The purchase price included contingent consideration of up to an additional €20.0 million ($26.2 million at June 30, 2013) based on achieving certain volume targets over a fifteen year period ending on December 31, 2026. We estimated the fair value of the contingent consideration using probability-weighted expected future cash flows and applied a discount rate that appropriately captures a market participant's view of the risk associated with the contingent consideration. Contingent consideration is included in Other non-current liabilities in the Unaudited Condensed Consolidated Balance Sheet. The valuation of the contingent consideration is classified utilizing Level 3 inputs consistent with assumptions which would be made by other market participants. There are many factors that could impact the likelihood that we will pay the contingent consideration and therefore its value, including overall economic conditions and our ability to drive sales volumes as planned. A change in a market participant view of risks could also impact the value of the contingent consideration.

We also hold financial instruments consisting of cash, accounts receivable, and accounts payable. The carrying amounts of cash, accounts receivable, and accounts payable approximate fair value due to the short-term maturities of these instruments. Long-term debt was repaid during the second quarter 2013 and previously had a fair value based on quoted market prices in previous periods, which are Level 1 inputs. Derivative instruments are recorded at fair value as indicated above.

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Unaudited Statements of Consolidated Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Consolidated net income	$ (3,326)	$ (22,584)	$ (114,789)	$ (10,736)
Foreign currency translation adjustments	9,089	(44,204)	(16,273)	(14,846)
Reclassification of foreign currency translation adjustment related to discontinued operations into earnings	8,838	0	8,838	0
Reclassification of hedging activities into earnings, net of tax	0	(1,123)	0	(1,780)
Unrealized gain on cash flow hedges, net of tax	(144)	(622)	(124)	2,918
Pension adjustment	492	202	593	404
Net change in accumulated other comprehensive income (loss)	18,275	(45,747)	(6,966)	(13,304)
Comprehensive income	14,949	(68,331)	(121,755)	(24,040)
Comprehensive (income) loss attributable to noncontrolling interests	0	245	1,749	346
Comprehensive income attributable to OM Group, Inc.	$ 14,949	$ (68,086)	$ (120,006)	$ (23,694)

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Unaudited Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 80,568	$ 227,612
Restricted cash on deposit	0	22,793
Accounts receivable, less allowance of $4,339 in 2013 and $5,215 in 2012	159,888	160,122
Inventories	240,805	452,699
Other current assets	43,730	43,225
Current assets - discontinued operations (excluding cash)	0	33,126
Total current assets	524,991	939,577
Property, plant and equipment, net	323,298	474,346
Goodwill	418,661	528,312
Intangible assets, net	399,203	417,110
Other non-current assets	60,674	86,879
Non-current assets - discontinued operations	0	53,203
Total assets	1,726,827	2,499,427
Current liabilities
Current portion of long-term debt	0	13,309
Accounts payable	81,366	116,991
Liability related to joint venture partner injunction	0	22,793
Accrued income taxes	817	23,871
Accrued employee costs	34,307	46,629
Purchase price of VAC payable to seller	75,444	75,351
Other current liabilities	58,045	59,574
Current liabilities - discontinued operations	0	20,726
Total current liabilities	249,979	379,244
Long-term debt	0	454,054
Deferred income taxes	107,394	117,739
Pension liabilities	229,653	232,867
Purchase price of VAC payable to seller	11,273	11,259
Other non-current liabilities	52,478	55,383
Non-current liabilities - discontinued operations	0	4,733
Stockholders' equity:
Preferred stock, $.01 par value: Authorized 2,000,000 shares, no shares issued or outstanding	0	0
Common stock $.01 par value: Authorized 90,000,000 shares; 32,813,555 shares issued in 2013 and 32,108,212 shares issued in 2012	321	320
Capital in excess of par value	635,044	631,063
Retained earnings	557,974	671,012
Treasury stock (825,956 shares in 2013 and 216,695 shares in 2012, at cost)	(22,318)	(7,681)
Accumulated other comprehensive income (loss)	(94,971)	(88,005)
Total OM Group, Inc. stockholders' equity	1,076,050	1,206,709
Noncontrolling interests	0	37,439
Total equity	1,076,050	1,244,148
Total liabilities and equity	$ 1,726,827	$ 2,499,427

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Earnings Per Share (Non-Vested Share-Based Compensation Awards That Could Potentially Dilute Earnings Per Share) (Details) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013
Earnings Per Share [Abstract]
Non-vested share-based compensation awards not included in the fully diluted computation (in shares)	0.3

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Defined Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2013

U.S. Pension Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of net benefit costs and amounts recognized in other comprehensive income (loss)

Set forth below is a detail of the net periodic pension expense for the U.S. defined benefit plans;

	Three Months Ended June 30						Six Months Ended June 30
	2013			2012			2013			2012
Service cost	$	296		$	258		$	591		$	544
Interest cost	2,114			2,762			4,229			5,056
Amortization of unrecognized net loss	211			218			423			419
Expected return on plan assets	(2,731		)	(2,623		)	(5,245		)	(5,236		)
Total expense	$	(110	)	$	615		$	(2	)	$	783

Non-U.S. Pension Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of net benefit costs and amounts recognized in other comprehensive income (loss)

Set forth below is a detail of the net periodic pension expense for the VAC defined benefit plans;

	Three Months Ended June 30				Six Months Ended June 30
	2013		2012		2013		2012
Service cost	$	1,172	$	939	$	2,357	$	1,899
Interest cost	1,461		1,855		2,938		3,750
Amortization of unrecognized net loss	263		—		529		—
Total expense	$	2,896	$	2,794	5,824		5,649

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Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

Principles of Consolidation

The consolidated financial statements include the accounts of OM Group and its consolidated subsidiaries. We were formed in 1991 as a Delaware Corporation. Intercompany accounts and transactions have been eliminated in consolidation.

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Income Taxes (Income (Loss) From Continuing Operations Before Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income (loss) from continuing operations before income tax expense:
United States	$ 189	$ (1,567)	$ (3,686)	$ (2,018)
Outside the United States	9,735	(26,689)	(94,778)	(9,333)
Income from continuing operations before income tax expense	$ 9,924	$ (28,256)	$ (98,464)	$ (11,351)
Effective Income Tax Rate, Continuing Operations	18.70%	18.60%	(4.50%)	2.80%

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Share-Based Compensation (Compensation Expense For Nonvested Share-Based Awards Expected To Be Recognized) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Share-based Compensation [Abstract]
Unrecognized compensation expense	$ 11.4
Unrecognized compensation expense to be recognized in 2013	3.2
Unrecognized compensation expense to be recognized in 2014	4.8
Unrecognized compensation expense to be recognized in 2015	3.2
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Amount Expected To Be Recognized In Year Four	$ 0.2

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Acquisitions/Divestiture Acquisitions/Divestiture (Income Statement Impact Discontinued Operations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax			$ 0	$ (112,061)	$ 0
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		(11,394)	414	(11,870)	295
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share		$ (0.37)	$ 0.01	$ (0.38)	$ 0.01
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share		$ (0.37)	$ 0.01	$ (0.38)	$ 0.01
Ultra Pure Chemicals [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue		16,004	24,405	38,520	46,828
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax		(1,583)	414	(2,059)	295
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	10,000	(9,811)	0	(9,811)	0
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		$ (11,394)	$ 414	$ (11,870)	$ 295
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share		$ (0.37)	$ 0.01	$ (0.38)	$ 0.01
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share		$ (0.37)	$ 0.01	$ (0.38)	$ 0.01

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Inventories (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Inventories [Line Items]
Inventory, Net	$ 240,805	$ 452,699
Advanced Materials [Member]
Inventories [Line Items]
Inventory, Net		$ 193,700

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Inventories (Inventories) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Inventory, Net [Abstract]
Raw materials and supplies	$ 79,468	$ 133,864
Work-in-process	119,247	187,691
Finished goods	42,090	131,144
Inventories, total	$ 240,805	$ 452,699

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Derivative Instruments

6 Months Ended

Jun. 30, 2013

Derivative Instruments and Hedges, Assets [Abstract]

Derivative Instruments

Derivative Instruments

Foreign Currency Exchange Rate Risk

Our primary Finnish operating subsidiary was included in the divestiture of our cobalt-based business on March 29, 2013. The functional currency for this subsidiary was the U.S. dollar since a majority of its purchases and sales were denominated in U.S. dollars. While a majority of the subsidiary’s raw material purchases were in U.S. dollars, it had some Euro-denominated operating expenses. From time to time, we would enter into foreign currency forward contracts to mitigate a portion of the earnings volatility in those Euro-denominated cash flows due to changes in the Euro/U.S. dollar exchange rate. As of June 30, 2013, we had no Euro forward contracts outstanding. We had Euro forward contracts with notional values that totaled 45.0 million Euros at June 30, 2012. As of June 30, 2012, AOCI included a cumulative loss related to such contracts of $2.7 million, all of which were reclassified to earnings in the fourth quarter 2012. We designated these derivatives as cash flow hedges of the subsidiary's forecasted Euro-denominated expenses. At June 30, 2012, we had a liability of $3.6 million recorded on the Unaudited Condensed Consolidated Balance Sheet in Other current liabilities related to these Euro forward contracts, all of which were reclassified to earnings in the fourth quarter 2012.

Interest Rate Risk

We utilize interest rate swap agreements to partially reduce risks related to variable rate financing agreements that are subject to changes in the market rate of interest.

We had interest rate swaps with notional values that totaled $198.5 million at June 30, 2012. Following the full repayment of the Term B facility at the end of March 2013, we elected in April 2013, to terminate all the remaining interest swaps contracts. The AOCI at the time of the termination represented an immaterial cumulative loss related to these contracts, which was reclassified to earnings in the second quarter 2013. At June 30, 2012, AOCI included a minimal cumulative loss related to these contracts, all of which was reclassified to earnings in the fourth quarter 2012. There was no hedge ineffectiveness in the six months ended June 30, 2013 or 2012, for these hedges.

Commodity Price Risk

In May 2013, we entered into nickel forward derivative contracts to establish a fixed margin and mitigate the risk of price volatility related to certain sales expected in 2013 and 2014 of nickel-containing finished products that were priced on a formula that included a fixed nickel price component. These forward derivative contracts have been designated as cash flow hedges for accounting purposes. We had forward contracts with fair values that totaled $0.3 million at June 30, 2013. There was no hedge ineffectiveness in the six months ended June 30, 2013 for these hedges.

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Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2013

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

Changes in Accumulated Comprehensive Income (Loss) by Component

	Foreign Currency Translation Loss			Unrealized Gains and Losses on Cash Flow Hedging Derivatives			Pension and Post-Retirement Obligation			Accumulated Other Comprehensive Income (Loss)
Beginning Balance at January 1, 2013	$	(21,299	)	$	(84	)	$	(66,622	)	$	(88,005	)
Other comprehensive income (loss) before reclassifications	(20,948		)	(184		)	593			(20,539		)
Amounts reclassified from accumulated other comprehensive (income) loss	13,513			60			—			13,573
Net current-period other comprehensive income (loss)	(7,435		)	(124		)	593			(6,966		)
Ending balance at June 30, 2013	$	(28,734	)	$	(208	)	$	(66,029	)	$	(94,971	)

Reclassifications Out of Accumulated Other Comprehensive Income (Loss)

Reclassifications out of Accumulated Other Comprehensive Income (loss)

Details about Accumulated Other Comprehensive Income (loss) Components	Amount Reclassified from Accumulated Other Comprehensive Income (loss)			Affected Line Item in the Statement Where Net Income is Presented
Foreign currency translation	$	(135	)	Foreign exchange gain/(loss)
	(4,540		)	Loss on divestiture of Advanced Materials business
	(8,838		)	Loss from discontinued operations, net of tax
	$	(13,513	)	Total before tax
	—			Tax (expense) or benefit
	$	(13,513	)	Net of Tax
Unrealized gains and losses on cash flow hedging derivatives	(60		)	Interest expense

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Fair Value Disclosures (Details)	Jun. 30, 2013 USD ($)	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] USD ($)	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Interest Rate Swap Agreements [Member] USD ($)	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Contingent Consideration [Member] USD ($)	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] USD ($)	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] Interest Rate Swap Agreements [Member] USD ($)	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] Contingent Consideration [Member] USD ($)	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] USD ($)	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Interest Rate Swap Agreements [Member] USD ($)	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Contingent Consideration [Member] USD ($)	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] USD ($)	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Interest Rate Swap Agreements [Member] USD ($)	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Contingent Consideration [Member] USD ($)	Jun. 30, 2013 Rahu Catalytics Limited [Member] USD ($)	Jun. 30, 2013 Rahu Catalytics Limited [Member] EUR (€)
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Fair value measurements, total liabilities		$ 13,292,000	$ 301,000	$ 12,991,000	$ 0	$ 0	$ 0	$ 301,000	$ 301,000	$ 0	$ 12,991,000	$ 0	$ 12,991,000
Transfer into or out of fair value measurement	0
Contigent considertion amounts based on certain volume targets														26,200,000	20,000,000
Long-term debt, fair value	$ 92,500,000

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Defined Benefit Plans

6 Months Ended

Jun. 30, 2013

Pension and Other Postretirement Benefit Expense [Abstract]

Defined Benefit Plans

Defined Benefit Plans

At June 30, 2013 and December 31, 2012, we had pension liabilities of $238.7 million and $242.5 million, respectively, the majority of which were assumed in the 2011 VAC acquisition and the 2010 EaglePicher Technologies acquisition.

Set forth below is a detail of the net periodic pension expense for the U.S. defined benefit plans;

	Three Months Ended June 30						Six Months Ended June 30
	2013			2012			2013			2012
Service cost	$	296		$	258		$	591		$	544
Interest cost	2,114			2,762			4,229			5,056
Amortization of unrecognized net loss	211			218			423			419
Expected return on plan assets	(2,731		)	(2,623		)	(5,245		)	(5,236		)
Total expense	$	(110	)	$	615		$	(2	)	$	783

Set forth below is a detail of the net periodic pension expense for the VAC defined benefit plans;

	Three Months Ended June 30				Six Months Ended June 30
	2013		2012		2013		2012
Service cost	$	1,172	$	939	$	2,357	$	1,899
Interest cost	1,461		1,855		2,938		3,750
Amortization of unrecognized net loss	263		—		529		—
Total expense	$	2,896	$	2,794	5,824		5,649

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Debt

6 Months Ended

Jun. 30, 2013

Debt Instruments [Abstract]

Debt

Debt

In connection with the acquisition of VAC, we entered into a Senior Secured Credit Facility. The borrowers under the Senior Secured Credit Facility are the Company and Harko C.V., a limited partnership organized under the laws of the Netherlands and a wholly-owned subsidiary of the Company (“Harko”). The Senior Secured Credit Facility provides for (i) a $100 million term loan A facility (the “Term A Facility”), (ii) a $350 million term loan B facility (the “Dollar Term B Facility”), (iii) a €175 million term loan facility (the “Euro Term B Facility” and, together with the Dollar Term B Facility, the “Term B Facility” and, together with the Term A Facility, the “Term Loan Facility”, each of which was fully drawn on August 2, 2011), and (iv) a $200 million undrawn revolving credit facility (the “Revolving Credit Facility”), of which up to $100 million may be denominated in Euros. The Revolving Credit Facility matures on August 2, 2016. As of June 30, 2013, we had no outstanding debt.

During the first quarter of 2013, we fully paid the outstanding balances of the Term B Facility by making principal pre-payments of $345.6 million on the Dollar Term B Facility and $27.2 million on the Euro Term B Facility using proceeds from the divestiture of the Advanced Materials business and cash on hand. We included $10.3 million of deferred financing fees in the loss on the divestiture since our Senior Secured Credit agreement requires the prepayment of debt with proceeds from a sale of a business.

During the second quarter of 2013, we fully paid the outstanding balances of the Term A Facility by making principal payments of $92.5 million using proceeds from the divestiture of the UPC business and cash on hand. We included $1.5 million of deferred financing fees in the loss on the divestiture of the UPC business since our Senior Secured Credit agreement requires the prepayment of debt with proceeds from a sale of a business.

We have the option to specify that interest be calculated based on either a London interbank offered rate (“LIBOR”) or on a variable base rate, plus, in each case, a calculated applicable margin range from 2.75% to 3.75%. At December 31, 2012, the weighted average interest rate for the outstanding borrowings under the Senior Secured Credit Facility was 5.66%.

The Senior Secured Credit Facility contains customary representations, warranties and covenants that limit the ability of the Company to, among other things: incur or guarantee additional indebtedness; pay distributions on capital stock; make investments; sell assets; consolidate, merge or transfer all or substantially all of their assets; and engage in transactions with affiliates. The Senior Secured Credit Facility also contains financial covenants related to a limitation on capital expenditures, measurement of the ratio of the Company's total indebtedness to the amount of the Company's adjusted "Consolidated EBITDA", and measurement of the interest coverage ratio as defined in the Senior Secured Credit Facility. As of June 30, 2013, we were in compliance with all of the covenants.

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Unaudited Condensed Statements of Consolidated Cash Flows Unaudited Condensed Statements of Consolidated Cash Flows (Parentheticals) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Statement of Cash Flows [Abstract]
Amount of Inventory Step-Up Amortization	$ 15.9

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Share-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense			$ 0	$ 0
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued	5,078	4,711	11,049	9,703

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Common Stock Repurchases (Details) (USD $) Share data in Millions, unless otherwise specified	0 Months Ended	6 Months Ended
	Jan. 21, 2013	Jun. 30, 2013	Jun. 30, 2012
Share Repurchase Program [Abstract]
Stock repurchase program, authorized amount	$ 50,000,000
Stock repurchased during period (in shares)		0.6
Stock repurchased during period		$ 14,083,000	$ 0

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Reportable Segments (Tables)

6 Months Ended

Jun. 30, 2013

Segment Reporting Information, Profit (Loss) [Abstract]

Results of reportable segments

The following table reflects the results of our reportable segments:

	Three Months Ended June 30						Six Months Ended June 30
	2013			2012			2013			2012
Net Sales
Magnetic Technologies	$	128,864		$	168,024		$	266,014		$	358,515
Battery Technologies	40,205			35,205			81,239			72,237
Specialty Chemicals (d)	83,444			84,810			160,749			168,298
Advanced Materials	26,875			124,261			113,313			257,234
Intersegment items	—			(237		)	(190		)	(466		)
	$	279,388		$	412,063		$	621,125		$	855,818
Operating profit
Magnetic Technologies (a) (b)	$	1,153		$	(30,146	)	$	7,512		$	(16,243	)
Battery Technologies (a)	8,155			6,063			16,473			11,718
Specialty Chemicals (a) (c) (d)	8,167			9,670			15,212			22,284
Advanced Materials	(381		)	923			1,365			12,034
Corporate	(7,947		)	(9,698		)	(17,280		)	(19,453		)
	9,147			(23,188		)	23,282			10,340
Interest expense	(1,818		)	(11,177		)	(9,463		)	(22,733		)
Foreign exchange gain (loss)	2,838			6,028			164			898
Loss on divestiture of Advanced Materials business	(515		)	—			(112,061		)	—
Other expense, net	272			81			(386		)	144
	777			(5,068		)	(121,746		)	(21,691		)
Income (loss) from continuing operations before income taxes	$	9,924		$	(28,256	)	$	(98,464	)	$	(11,351	)
Expenditures for property, plant & equipment
Magnetic Technologies	$	5,106		$	6,499		$	8,007		$	9,995
Battery Technologies	848			1,002			1,901			2,223
Specialty Chemicals (d)	2,796			1,319			5,013			1,814
Advanced Materials	—			8,560			6,340			13,697
Corporate										—
	$	8,750		$	17,380		$	21,261		$	27,729
Depreciation and amortization
Magnetic Technologies	$	10,705		$	10,010		$	21,469		$	20,222
Battery Technologies	2,531			2,509			5,033			5,011
Specialty Chemicals (d)	3,647			3,986			7,498			7,852
Advanced Materials	(333		)	4,271			3,871			8,495
Corporate	131			147			192			262
	$	16,681		$	20,923		$	38,063		$	41,842

(a) The three and six months ended June 30, 2013 include costs related to cost reduction initiatives of $0.4 million and $4.2 million in Magnetic Technologies, $0.5 million and $0.7 million in Battery Technologies, and $1.1 million and $1.1 million in Specialty Chemicals, respectively.

(b) The three and six months ended June 30, 2012 includes inventory step-up and LCM charges of $31.5 million and $47.3 million, respectively, resulting from purchase accounting for the VAC acquisition.

(c) The six months ended June 30, 2012 includes a $2.9 million property sale gain.

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Earnings Per Share

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Earnings Per Share

Earnings (Loss) Per Share

The following table sets forth the computation of basic and dilutive income (loss) per common share from continuing operations attributable to OM Group, Inc. common stockholders:

	Three Months Ended June 30					Six Months Ended June 30
Amounts attributable to OM Group, Inc. common stockholders:	2013		2012			2013			2012
(in thousands, except per share amounts)
Income (loss) from continuing operations, net of tax	$	8,068	$	(22,753	)	$	(101,170	)	$	(10,685	)
Earnings (loss) per common share - basic:
Income (loss) from continuing operations	$	0.26	$	(0.71	)	$	(3.19	)	$	(0.34	)
Earnings (loss) per common share - assuming dilution:
Income (loss) from continuing operations	$	0.26	$	(0.71	)	$	(3.19	)	$	(0.34	)
Weighted average shares outstanding — basic	31,452		31,882			31,673			31,878
Dilutive effect of stock options and restricted stock	169		—			—			—
Weighted average shares outstanding — assuming dilution	31,621		31,882			31,673			31,878

The following table sets forth the computation of basic and diluted net income (loss) per common share attributable to OM Group, Inc. common stockholders:

	Three Months Ended June 30						Six Months Ended June 30
Amounts attributable to OM Group, Inc. common stockholders:	2013			2012			2013			2012
(in thousands, except per share amounts)
Net income (loss)	$	(3,326	)	$	(22,339	)	$	(113,040	)	$	(10,390	)
Earnings (loss) per common share - basic:
Net income (loss)	$	(0.11	)	$	(0.70	)	$	(3.57	)	$	(0.33	)
Earnings per common share - assuming dilution:
Net income (loss)	$	(0.11	)	$	(0.70	)	$	(3.57	)	$	(0.33	)
Weighted average shares outstanding — basic	31,452			31,882			31,673			31,878
Dilutive effect of stock options and restricted stock	169			—			—			—
Weighted average shares outstanding — assuming dilution	31,621			31,882			31,673			31,878

We use the treasury stock method to calculate the effect of outstanding share-based compensation awards, which requires us to compute total employee proceeds as the sum of (a) the amount the employee must pay upon exercise of the award, (b) the amount of unearned share-based compensation costs attributed to future services and (c) the amount of tax benefits, if any, that would be credited to additional paid-in capital assuming exercise of the award. Shares, under share-based compensation awards, for which the total employee proceeds exceed the average market price over the applicable period have an anti-dilutive effect on earnings per share, and accordingly, are excluded from the calculation of diluted earnings per share.

In the three months ended June 30, 2013, stock options to purchase 0.3 million shares of common stock were excluded from the calculation of dilutive earnings per share because the options’ exercise prices were greater than the average market price of the common shares and, therefore, the effect would have been anti-dilutive.

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Income Taxes

6 Months Ended

Jun. 30, 2013

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various U.S. state and foreign jurisdictions. Our major tax jurisdictions are the U.S. and Germany. With few exceptions, we are no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2006. The Internal Revenue Service is currently examining our 2010 U.S. federal income tax return and Finnish tax authorities are currently examining tax returns for the years 2007-2011. VAC's German tax returns have been audited through 2005. We are indemnified, subject to certain limitations, for any pre-acquisition income tax liabilities of VAC. German tax authorities are currently examining VAC's income tax returns for the years 2006-2009.

As required under ASC 740, our interim income tax provision is based on the application of an estimated annual effective income tax rate applied to year-to-date ordinary income from continuing operations before income tax expense. In determining the estimated annual effective income tax rate, we analyze various factors, including forecasts of projected annual earnings (including specific subsidiaries projected to have pretax income and pretax losses), taxing jurisdictions in which the earnings will be generated, our ability to use tax credits and net operating loss carryforwards, and available tax planning alternatives. We evaluate the estimated annual effective income tax rate on a quarterly basis based on current and forecasted earnings by tax jurisdiction, including changes in the Company's structure. The estimated annual effective income tax rate may be significantly impacted by changes to the mix of forecasted earnings by tax jurisdiction. The tax effects of adjustments to the estimated annual effective income tax rate are recorded in the period such estimates are revised. The tax effects of discrete items, including the effect of changes in tax laws, tax rates, certain circumstances with respect to valuation allowances or other unusual or non-recurring items, are reflected in the period in which they occur as an addition to, or reduction from, the income tax provision, rather than included in the estimated annual effective income tax rate.

Income (loss) from continuing operations before income tax expense consists of the following:

	Three Months Ended June 30						Six Months Ended June 30
	2013			2012			2013			2012
United States	$	189		$	(1,567	)	$	(3,686	)	$	(2,018	)
Outside the United States	9,735			(26,689		)	(94,778		)	(9,333		)
Income (loss) from continuing operations before income tax expense	$	9,924		$	(28,256	)	$	(98,464	)	$	(11,351	)
Effective Income Tax Rate	18.7		%	18.6		%	(4.5		)%	2.8		%

The effective income tax rates for the three months ended June 30, 2013 and June 30, 2012 are lower than the U.S. statutory tax rate primarily due to income earned in tax jurisdictions with lower statutory rates than the U.S. (primarily Germany, Finland, Malaysia and Taiwan) and a tax-efficient financing structure, partially offset by losses in certain jurisdictions (including the U.S.) with no corresponding tax benefit.

Our effective income tax rate for the six months ended June 30, 2013 was negatively impacted by special charges related to the divestiture of the Advanced Materials business. There were no tax benefits on the losses on the divestitures of the Advanced Materials and UPC businesses due to the Company's legal entity and tax structure.

Our effective income tax rate for the six months ended June 30, 2012 was impacted by the charges related to the VAC inventory purchase accounting step-up and LCM charges.

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Reportable Segments

6 Months Ended

Jun. 30, 2013

Segment Reporting Information, Profit (Loss) [Abstract]

Reportable Segments

Reportable Segments

We operate and report our results in four operating segments: Magnetic Technologies, Battery Technologies, Specialty Chemicals, and Advanced Materials. Intersegment transactions are generally recognized based on current market prices and are eliminated in consolidation. Corporate is comprised of general and administrative expenses not allocated to the operating segments.

The following table reflects the results of our reportable segments:

	Three Months Ended June 30						Six Months Ended June 30
	2013			2012			2013			2012
Net Sales
Magnetic Technologies	$	128,864		$	168,024		$	266,014		$	358,515
Battery Technologies	40,205			35,205			81,239			72,237
Specialty Chemicals (d)	83,444			84,810			160,749			168,298
Advanced Materials	26,875			124,261			113,313			257,234
Intersegment items	—			(237		)	(190		)	(466		)
	$	279,388		$	412,063		$	621,125		$	855,818
Operating profit
Magnetic Technologies (a) (b)	$	1,153		$	(30,146	)	$	7,512		$	(16,243	)
Battery Technologies (a)	8,155			6,063			16,473			11,718
Specialty Chemicals (a) (c) (d)	8,167			9,670			15,212			22,284
Advanced Materials	(381		)	923			1,365			12,034
Corporate	(7,947		)	(9,698		)	(17,280		)	(19,453		)
	9,147			(23,188		)	23,282			10,340
Interest expense	(1,818		)	(11,177		)	(9,463		)	(22,733		)
Foreign exchange gain (loss)	2,838			6,028			164			898
Loss on divestiture of Advanced Materials business	(515		)	—			(112,061		)	—
Other expense, net	272			81			(386		)	144
	777			(5,068		)	(121,746		)	(21,691		)
Income (loss) from continuing operations before income taxes	$	9,924		$	(28,256	)	$	(98,464	)	$	(11,351	)
Expenditures for property, plant & equipment
Magnetic Technologies	$	5,106		$	6,499		$	8,007		$	9,995
Battery Technologies	848			1,002			1,901			2,223
Specialty Chemicals (d)	2,796			1,319			5,013			1,814
Advanced Materials	—			8,560			6,340			13,697
Corporate										—
	$	8,750		$	17,380		$	21,261		$	27,729
Depreciation and amortization
Magnetic Technologies	$	10,705		$	10,010		$	21,469		$	20,222
Battery Technologies	2,531			2,509			5,033			5,011
Specialty Chemicals (d)	3,647			3,986			7,498			7,852
Advanced Materials	(333		)	4,271			3,871			8,495
Corporate	131			147			192			262
	$	16,681		$	20,923		$	38,063		$	41,842

(a) The three and six months ended June 30, 2013 include costs related to cost reduction initiatives of $0.4 million and $4.2 million in Magnetic Technologies, $0.5 million and $0.7 million in Battery Technologies, and $1.1 million and $1.1 million in Specialty Chemicals, respectively.

(b) The three and six months ended June 30, 2012 includes inventory step-up and LCM charges of $31.5 million and $47.3 million, respectively, resulting from purchase accounting for the VAC acquisition.

(c) The six months ended June 30, 2012 includes a $2.9 million property sale gain.

(d) All results related to the UPC business are excluded from the Special Chemicals segment for all periods presented.

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Share-Based Compensation

6 Months Ended

Jun. 30, 2013

Share-based Compensation [Abstract]

Share-Based Compensation

Share-Based Compensation

Set forth below is a summary of share-based compensation expense for option grants, restricted stock awards and restricted stock unit awards included as a component of Selling, general and administrative expenses in the Unaudited Condensed Statements of Consolidated Income (in thousands):

	Three Months Ended June 30					Six Months Ended June 30
	2013		2012			2013		2012
Stock options and restricted stock awards	$	1,402	$	1,282		$	2,738	$	3,558
Restricted stock unit awards	51		(232		)	182		111
Share-based compensation expense - employees	$	1,453	$	1,050		$	2,920	$	3,669
Share-based compensation expense - non-employee directors	$	113	$	132		$	238	$	263

No tax benefit for share-based compensation was realized during 2013 or 2012 as a result of a valuation allowance against the deferred tax assets.

At June 30, 2013, there was $11.4 million of unrecognized compensation expense related to unvested share-based awards. That cost is expected to be recognized as follows: $3.2 million in the last six months of 2013, $4.8 million in 2014, $3.2 million in 2015 and $0.2 million in 2016 as a component of Selling, general and administrative expenses. Unearned compensation expense is recognized over the vesting period for the particular grant. Total unrecognized compensation cost will be adjusted for future changes in actual and estimated forfeitures, updated vesting assumptions for the performance awards, and fluctuations in the fair value of restricted stock unit awards.

Non-employee directors of the Company are paid a portion of their annual retainer in unrestricted shares of common stock. For purposes of determining the number of shares of common stock to be issued, the 2007 Plan provides that shares are to be valued at the average of the high and low sale price of the Company’s common stock on the NYSE on the last trading date of the quarter. Pursuant to this plan, the Company issued 5,078 shares and 11,049 shares in the three and six months ended June 30, 2013 and 4,711 shares and 9,703 shares in the three and six months ended June 30, 2012, respectively, to non-employee directors.

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Document and Entity Information	6 Months Ended
	Jun. 30, 2013	Jul. 31, 2013
Document And Entity Information [Abstract]
Entity Registrant Name	OM GROUP INC
Entity Central Index Key	0000899723
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		31,954,947

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

During 2009 and 2010, GTL was served in Jersey, Channel Islands, with injunctions that prohibited GTL from making payments of up to $108.3 million to Gécamines, a minority partner in GTL, including amounts payable for raw material purchases, and restrained Gécamines from removing any of its assets from the island of Jersey up to the amount of 14.5 million British Pounds. In both matters, payments which we would typically have made to Gécamines were instead placed on deposit with the Royal Court of Jersey ("Court"). As of December 31, 2012, $22.8 million remained on deposit with the Court and was recorded as Restricted cash on deposit and Liability related to joint venture partner injunction in the Consolidated Balance Sheets. In January 2013, the case related to the second injunction was dropped, and remaining funds on deposit with the Court were released by GTL to Gécamines in March 2013. Our interest in GTL was transferred to the joint venture partners on March 29, 2013.

We have potential contingent liabilities with respect to environmental matters related to our former operations in Brazil and Germany which were sold in 2003. Environmental cost-sharing arrangements are in place between the original owner and operator of these operations and between the Company and the subsequent purchaser of these operations. We have reviewed the limited information made available to us on the environmental conditions and are awaiting more detailed information from the purchaser. We cannot currently evaluate whether or not, or to what extent, we will be responsible for any remediation costs until more detailed information is received.

From time to time, we are subject to various legal and regulatory proceedings, claims and assessments that arise in the normal course of business. The ultimate resolution of such proceedings, claims and assessments is inherently unpredictable and, as a result, our estimates of liability, if any, are subject to change and actual results may materially differ from such estimates. Our estimate of any costs to be incurred as a result of these proceedings, claims and assessments are accrued when the liability is considered probable and the amount can be reasonably estimated. We believe the amount of any potential liability with respect to legal and regulatory proceedings, claims and assessments will not have a material adverse effect upon our financial condition, results of operations, or cash flows.