Balance Sheet Components (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Other current assets:
Deposits	$ 338	$ 407
Assets held for sale	2,824	2,824
Deferred income taxes	14,004	12,686
Income taxes receivable	3,063	0
Other receivables	6,478	5,310
Other current assets	26,707	21,227
Other assets, net:
Deferred financing costs	6,631	6,039
Cash value life insurance	1,426	1,513
Other	2,165	4,281
Other assets, net	10,222	11,833
Other current liabilities:
Accrued interest	2,099	3,206
Accrued other taxes	2,005	2,497
Accrued income taxes	0	1,066
Accrued rebates	7,969	4,090
Accrued employee separation and plant closure costs	1,113	2,578
Accrued other	11,467	12,376
Other current liabilities	24,653	25,813
Other long-term liabilities:
Accrued environmental	4,745	6,355
Accrued contingent consideration	6,150	5,845
Accrued contingencies and other	1,462	1,034
Other long-term liabilities	$ 12,357	$ 13,234