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Condensed Consolidated Statements of Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Condensed Consolidated Statements of Income [Abstract]    
Net sales $ 190,245 $ 177,493
Cost of sales 145,801 123,639
Gross profit 44,444 53,854
Selling, general and administrative expense 21,391 20,585
Provisions for losses on accounts receivable 40 42
Other expense 167 62
Other income (236) (872)
Operating income 23,082 34,037
Interest expense 1,132 1,712
Non-operating other income, net (5) (7)
Income from continuing operations before provisions for income taxes and equity in earnings of affiliate 21,955 32,332
Provisions for income taxes 7,802 11,657
Equity in earnings of affiliate (171) (285)
Income from continuing operations 14,324 20,960
Net loss from discontinued operations 21 57
Net income 14,303 20,903
Dividends on preferred stocks 300 305
Net income applicable to common stock $ 14,003 $ 20,598
Weighted-average common shares:    
Basic 22,324 21,180
Diluted 23,524 23,444
Income per common share:    
Basic $ 0.63 $ 0.97
Diluted $ 0.61 $ 0.90