Balance Sheet Components (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other current assets:
Deposits	$ 244	$ 338
Assets held for sale	650	2,824
Income taxes receivable	0	3,063
Other receivables	15,091	6,478
Other current assets	15,985	12,703
Other assets:
Deferred financing costs	6,546	6,631
Cash value of life insurance	1,488	1,426
Other	5,203	2,165
Other assets	13,237	10,222
Other current liabilities:
Accrued interest	2,170	2,099
Accrued other taxes	2,556	2,005
Accrued income taxes	2,244	0
Accrued rebates	7,242	7,969
Accrued employee separation and plant closure costs	1,102	1,113
Accrued other	15,156	11,467
Other current liabilities	30,470	24,653
Other long-term liabilities:
Accrued environmental	4,586	4,745
Accrued contingent consideration (1)	1,898	6,150
Accrued contingencies and other	4,811	1,462
Other long-term liabilities	$ 11,295	$ 12,357