Unaudited Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 115,229	$ 227,612
Restricted cash on deposit	0	22,793
Accounts receivable, less allowance of $4,419 in 2013 and $5,215 in 2012	165,250	174,613
Inventories	263,371	463,093
Other current assets	53,355	51,465
Total current assets	597,205	939,576
Property, plant and equipment, net	342,385	496,755
Goodwill	429,440	543,269
Intangible assets, net	411,838	429,672
Other non-current assets	60,702	90,155
Total assets	1,841,570	2,499,427
Current liabilities
Current portion of long-term debt	8,750	13,309
Accounts payable	82,058	128,381
Liability related to joint venture partner injunction	0	22,793
Accrued income taxes	14,510	23,913
Accrued employee costs	29,368	41,762
Purchase price of VAC payable to seller	75,397	75,351
Other current liabilities	82,854	73,736
Total current liabilities	292,937	379,245
Long-term debt	83,750	454,054
Deferred income taxes	108,725	121,451
Pension liabilities	226,738	233,823
Purchase price of VAC payable to seller	11,266	11,259
Other non-current liabilities	50,354	55,446
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; 32,680,490 shares issued in 2013 and 32,122,261 shares issued in 2012	321	321
Capital in excess of par value	632,644	631,063
Retained earnings	561,299	671,012
Treasury stock (439,451 shares in 2013 and 216,695 shares in 2012, at cost)	(13,217)	(7,681)
Accumulated other comprehensive income (loss)	(113,247)	(88,005)
Total OM Group, Inc. stockholders' equity	1,067,800	1,206,710
Noncontrolling interests	0	37,439
Total equity	1,067,800	1,244,149
Total liabilities and equity	$ 1,841,570	$ 2,499,427