Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Allowances for accounts receivable	$ 3,570	$ 3,584
Replacement cost, inventories	$ 143,479	$ 138,882
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	9,988	9,988
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	30,000	30,000
Common stock, shares issued	23,159	23,159
Common stock, shares outstanding	23,009	23,010
Treasury stock, shares	150	149