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Unaudited Quarterly Financial Data (Schedule of Quarterly Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Data [Abstract]                      
Net sales $ 189,731 $ 175,764 $ 99,545 $ 182,966 $ 190,365 $ 203,386 $ 222,241 $ 218,297 $ 648,006 $ 834,289 $ 866,199
Gross profit 49,550 45,995 13,254 45,397 44,198 51,855 56,827 60,853      
Operating income (loss) 5,673 9,827 (26,823) 3,659 1,073 9,323 49,186 11,699 (7,664) 71,281 67,004
Income tax expense (benefit) on operations 920 1,814 (6,721) 1,213 (4,249) 1,450 9,066 1,835 (2,774) 8,102 11,210
Net (loss) income $ 3,580 $ 6,714 $ (21,734) $ 3,490 $ 4,209 $ 6,661 $ 39,764 $ 9,657 $ (7,950) $ 60,291 $ 53,848
Earnings (loss) per share:                      
Basic (in dollars per share) $ 0.13 $ 0.25 $ (0.81) $ 0.13 $ 0.15 $ 0.24 $ 1.43 $ 0.34 $ (0.29) $ 2.17 $ 1.90
Diluted (in dollars per share) $ 0.13 $ 0.25 $ (0.81) $ 0.13 $ 0.15 $ 0.24 $ 1.41 $ 0.33 $ (0.29) $ 2.13 $ 1.85