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Condensed Consolidated Statements of Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Condensed Consolidated Statements of Income [Abstract]        
Net sales $ 209,275 $ 235,619 $ 399,520 $ 413,112
Cost of sales 143,540 163,533 289,341 287,172
Gross profit 65,735 72,086 110,179 125,940
Selling, general and administrative expense 22,886 22,517 44,277 43,102
Provisions for losses on accounts receivable 83 79 123 121
Other expense 555 2,321 722 2,383
Other income (112) (1,105) (348) (1,977)
Operating income 42,323 48,274 65,405 82,311
Interest expense 1,179 1,868 2,311 3,580
Losses on extinguishment of debt   136   136
Non-operating other expense (income), net (267) 2 (272) (5)
Income from continuing operations before provisions for income taxes and equity in earnings and losses of affiliate 41,411 46,268 63,366 78,600
Provisions for income taxes 15,451 17,492 23,253 29,149
Equity in losses (earnings) of affiliate (170) 78 (341) (207)
Income from continuing operations 26,130 28,698 40,454 49,658
Net loss from discontinued operations 97 53 118 110
Net income 26,033 28,645 40,336 49,548
Dividends on preferred stocks     300 305
Net income applicable to common stock $ 26,033 $ 28,645 $ 40,036 $ 49,243
Weighted-average common shares:        
Basic 22,341 22,133 22,332 21,657
Diluted 23,509 23,526 23,516 23,485
Income per common share:        
Basic $ 1.17 $ 1.29 $ 1.79 $ 2.27
Diluted $ 1.11 $ 1.22 $ 1.72 $ 2.12