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Quarterly Financial Data Unit (Unaudited) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Selected quarterly financial information [Abstract]                      
Net sales $ 192,355,000 $ 275,975,000 $ 268,875,000 $ 211,711,000 $ 174,170,000 $ 236,220,000 $ 244,005,000 $ 220,230,000 $ 948,916,000 $ 874,625,000 $ 810,910,000
Gross profit 57,967,000 77,808,000 69,344,000 54,550,000 48,334,000 64,488,000 63,173,000 53,152,000 259,669,000 229,147,000 207,606,000
Earnings from continuing operations 6,310,000 17,444,000 13,721,000 5,494,000 29,523,000 [1] 14,100,000 [1] 13,693,000 [1] 7,011,000 [1] 42,969,000 64,327,000 24,700,000
Loss on discontinued operations, net of taxes (395,000) (604,000) (317,000) (300,000) (212,000) (1,055,000) (355,000) (304,000) (1,616,000) (1,926,000) (2,740,000)
Net earnings 5,915,000 16,840,000 13,404,000 5,194,000 29,311,000 [1] 13,045,000 [1] 13,338,000 [1] 6,707,000 [1] 41,353,000 62,401,000 21,960,000
Net earnings from continuing operations per common share [Abstract]                      
Basic (in dollars per share) $ 0.28 $ 0.77 $ 0.60 $ 0.24 $ 1.30 $ 0.62 $ 0.60 $ 0.31 $ 1.88 $ 2.82 $ 1.10
Diluted (in dollars per share) $ 0.27 $ 0.76 $ 0.59 $ 0.24 $ 1.29 $ 0.61 $ 0.59 $ 0.31 $ 1.86 $ 2.78 $ 1.09
Net earnings per common share [Abstract]                      
Basic (in dollars per share) $ 0.26 $ 0.74 $ 0.59 $ 0.23 $ 1.29 $ 0.57 $ 0.58 $ 0.30 $ 1.81 $ 2.74 $ 0.97
Diluted (in dollars per share) $ 0.26 $ 0.74 $ 0.58 $ 0.22 $ 1.28 $ 0.57 $ 0.58 $ 0.29 $ 1.79 $ 2.70 $ 0.97
Realized non-recurring benefit related to deferred tax valuation allowance                   $ 21,500,000  
[1] In December 2011, we realized a non-recurring non-cash benefit of $21.5 million in our tax provision related to a reduction of a significant portion of our deferred tax valuation allowance on net U.S. deferred tax assets.