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Consolidated Quarterly Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Net Sales $ 285,212 $ 273,255 $ 292,197 $ 272,847 $ 279,295 $ 261,921 $ 270,791 $ 191,059 $ 1,123,511 $ 1,003,066 $ 808,572
Gross Profit 112,172 106,509 117,225 109,116 113,866 103,081 103,130 79,736 445,033 399,813 351,595
Net Earnings $ 7,717 $ 9,676 $ 12,744 $ 3,274 $ (3,206) $ 3,559 $ (2,591) $ (3,957) $ 33,412 $ (6,195) $ 46,614
Basic (in dollars per share) $ 0.43 $ 0.54 $ 0.71 $ 0.18 $ (0.18) $ 0.20 $ (0.15) $ (0.22) $ 1.86 $ (0.35) $ 2.66
Diluted (in dollars per share) 0.42 0.52 0.69 0.18 (0.18) 0.20 (0.15) (0.22) 1.82 (0.35) 2.59
Cash dividends declared per common share (in dollars per share) $ 0.22 $ 0.21 $ 0.21 $ 0.21 $ 0.21 $ 0.21 $ 0.21 $ 0.21 $ 0.85 $ 0.84 $ 0.81