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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Selected quarterly financial information [Abstract]                      
Net sales $ 204,967 $ 270,037 $ 269,382 $ 227,589 $ 218,054 $ 257,046 $ 272,540 $ 232,752 $ 971,975 $ 980,392 $ 983,704
Gross profit 62,786 81,553 72,760 63,889 67,094 77,227 77,399 67,910 280,988 289,630 290,454
Earnings from continuing operations 5,779 19,194 13,808 9,339 11,517 17,806 11,169 12,407 48,120 52,899 53,043
Loss from discontinued operations, net of taxes (553) (728) (430) (391) (419) (8,240) (529) (682) (2,102) (9,870) (1,593)
Net earnings $ 5,226 $ 18,466 $ 13,378 $ 8,948 $ 11,098 $ 9,566 $ 10,640 $ 11,725 $ 46,018 $ 43,029 $ 51,450
Net earnings from continuing operations per common share [Abstract]                      
Basic (in dollars per share) $ 0.26 $ 0.84 $ 0.60 $ 0.41 $ 0.50 $ 0.78 $ 0.49 $ 0.54 $ 2.11 $ 2.31 $ 2.31
Diluted (in dollars per share) 0.25 0.83 0.59 0.40 0.50 0.77 0.48 0.53 2.08 2.28 2.28
Net earnings per common share [Abstract]                      
Basic (in dollars per share) 0.23 0.81 0.58 0.39 0.48 0.42 0.47 0.51 2.02 1.88 2.24
Diluted (in dollars per share) $ 0.23 $ 0.80 $ 0.58 $ 0.39 $ 0.48 $ 0.41 $ 0.46 $ 0.50 $ 1.99 $ 1.85 $ 2.21