Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Allowances for accounts receivable	$ 3,529	$ 3,584
Amount Current Replacement Cost of Inventory Costs Exceeds Book Value	$ 139,940	$ 138,882
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	9,988	9,988
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	60,000	30,000
Common stock, shares issued	23,211	23,159
Common stock, shares outstanding	23,152	23,010
Treasury stock, shares	59	149
Series B Junior Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	400	400
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0