Consolidated Condensed Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues	$ 525,134	$ 497,421	$ 539,447
Costs and expenses:
Cost of goods sold	390,666	382,252	423,353
Selling, general and administrative expenses	49,419	40,549	39,347
Environmental remediation charge	0	1,200	4,096
Asset impairment charge	107	1,180	0
Total costs and expenses	440,192	425,181	466,796
Operating income	84,942	72,240	72,651
Interest expense, net	(25,539)	(27,829)	(27,780)
Income from continuing operations before taxes	59,403	44,411	44,871
Income tax provision	(16,809)	(4,145)	(4,596)
Income from continuing operations	42,594	40,266	40,275
Discontinued operations, net	0	0	119
Net income	$ 42,594	$ 40,266	$ 40,394
Net income per common share:
Basic (in dollars per share)	$ 1.06	$ 1.00	$ 1.01
Diluted (in dollars per share)	$ 1.05	$ 1.00	$ 1.00