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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements of Income [Abstract]      
Net sales $ 805,256 $ 609,905 $ 531,838
Cost of sales 582,238 471,280 394,424
Gross profit 223,018 138,625 137,414
Selling, general and administrative expense 86,343 89,720 96,374
Provisions for losses on accounts receivable 347 145 90
Other expense 3,823 1,262 527
Other income (3,938) (8,427) (287)
Operating income 136,443 55,925 40,710
Interest expense 6,658 7,427 6,746
Losses (gain) on extinguishment of debt 136 52 (1,783)
Non-operating other income, net   (53) (130)
Income from continuing operations before provisions for income taxes and equity in earnings of affiliate 129,649 48,499 35,877
Provisions for income taxes 46,208 19,787 15,024
Equity in earnings of affiliate (543) (1,003) (996)
Income from continuing operations 83,984 29,715 21,849
Net loss from discontinued operations 142 141 265
Net income 83,842 29,574 21,584
Dividends on preferred stocks 305 305 306
Net income applicable to common stock $ 83,537 $ 29,269 $ 21,278
Basic:      
Income from continuing operations $ 3.81 $ 1.39 $ 1.01
Net loss from discontinued operations $ (0.01) $ (0.01) $ (0.01)
Net income $ 3.80 $ 1.38 $ 1.00
Diluted:      
Income from continuing operations $ 3.59 $ 1.33 $ 0.97
Net loss from discontinued operations $ (0.01) $ (0.01) $ (0.01)
Net income $ 3.58 $ 1.32 $ 0.96