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Selected Quarterly Financial Data (Unaudited) (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
Selected Quarterly Financial Data (Unaudited) [Abstract]                      
Net sales $ 241,339 $ 217,513 $ 109,968 $ 179,432 $ 213,837 $ 209,320 $ 191,893 $ 187,242 $ 748,252 $ 802,291 $ 817,733
Gross profit 137,619 122,177 59,646 99,553 115,830 112,019 103,557 103,083 418,994 434,488 446,542
Income before taxes 31,274 24,532 18,625 2,300 7,592 8,169 8,237 4,725 76,731 28,724 40,408
Net income 25,428 $ 18,261 $ 13,640 $ 1,819 6,100 $ 6,097 $ 6,046 $ 3,621 59,148 21,865 30,307
Earnings Per Share [Abstract]                      
State tax credits $ (1,200)               (1,206) (4) (3)
Impairment loss         2,415       0   0
Deferred tax benefit related to leases         $ (400)       $ 0 $ (418) $ 0
Common Stock [Member]                      
Earnings Per Share [Abstract]                      
Basic earnings per share (in dollars per share) $ 1.40 $ 0.98 $ 0.73 $ 0.10 $ 0.32 $ 0.31 $ 0.30 $ 0.18 $ 3.18 $ 1.10 $ 1.45
Diluted earnings per share (in dollars per share) 1.37 0.97 0.72 0.09 0.31 0.31 0.29 0.17 3.12 1.08 1.42
Common Stock [Member] | Class A Common Stock [Member]                      
Earnings Per Share [Abstract]                      
Basic earnings per share (in dollars per share) 1.33 0.94 0.69 0.09 0.30 0.30 0.28 0.17 3.04 1.04 1.39
Diluted earnings per share (in dollars per share) $ 1.35 $ 0.93 $ 0.69 $ 0.09 $ 0.30 $ 0.30 $ 0.27 $ 0.17 $ 3.04 $ 1.03 $ 1.39