Condensed Statements of Consolidated Total Equity (USD $) In Thousands	OM Group Inc. stockholders' equity	Common Stock	Capital in Excess of Par Value	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Noncontrolling interest	Total
Beginning balance at Dec. 31, 2009		$ 304	$ 569,487	$ 584,508	$ (6,025)	$ (16,969)	$ 44,827
Beginning balance, Shares at Dec. 31, 2009		30,269
Shares issued under share-based compensation plans, shares		238
Share-based compensation			2,779					2,779
Excess tax benefit from exercise/vesting of share awards			93
Shares issued under share-based compensation plans		3	3,799
Net income attributable to OM Group, Inc.				35,389				35,389
Reacquired shares					(1,209)
Foreign currency translation adjustment						(7,929)		(7,929)
Reclassification of hedging activities into earnings, net of tax expense (benefit) of $131 and ($427) in 2011 and 2010, respectively						1,215		1,215
Unrealized gain (loss) on cash flow hedges, net of tax expense (benefit) of $131 and $1,398 in 2011 and 2010, respectively						(4,266)		(4,266)
Net (income) loss attributable to the noncontrolling interest							(5,916)	(5,916)
Foreign currency translation							(8)
Ending balance at Jun. 30, 2010	1,161,179	307	576,158	619,897	(7,234)	(27,949)	38,903	1,200,082
Ending balance, Shares at Jun. 30, 2010		30,507
Beginning balance at Dec. 31, 2010		307	578,948	667,882	(7,234)	(3,119)	39,834	1,276,618
Beginning balance, Shares at Dec. 31, 2010		30,523
Shares issued under share-based compensation plans, shares		21
Share-based compensation			3,523					3,523
Shares issued under share-based compensation plans			157
Net income attributable to OM Group, Inc.				55,272				55,272
Reacquired shares					(193)
Foreign currency translation adjustment						11,295		11,295
Pension liability adjustment						200		200
Reclassification of hedging activities into earnings, net of tax expense (benefit) of $131 and ($427) in 2011 and 2010, respectively						(373)		(373)
Unrealized gain (loss) on cash flow hedges, net of tax expense (benefit) of $131 and $1,398 in 2011 and 2010, respectively						496		496
Net (income) loss attributable to the noncontrolling interest							1,482	1,482
Foreign currency translation							4
Ending balance at Jun. 30, 2011	$ 1,307,161	$ 307	$ 582,628	$ 723,154	$ (7,427)	$ 8,499	$ 41,320	$ 1,348,481
Ending balance, Shares at Jun. 30, 2011		30,544