Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Allowances for accounts receivable	$ 3,375	$ 3,463
Amount Current Replacement Cost of Inventory Costs Exceeds Book Value	$ 129,779	$ 130,854
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	60,000
Common stock, shares issued	23,630	23,471
Common stock, shares outstanding	23,559	23,409
Treasury stock, shares	71	62
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