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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net sales $ 748,252 $ 802,291 $ 817,733
Cost of goods sold 329,258 367,803 371,191
Gross profit 418,994 434,488 446,542
Expenses:      
Selling, general and administrative 377,288 407,456 404,856
Other income, net (34,899) (405) (145)
Total expenses 342,389 407,051 404,711
Income before interest and income taxes 76,605 27,437 41,831
Interest (income) expense, net (126) (1,287) 1,423
Income before income taxes 76,731 28,724 40,408
Income tax expense 17,583 6,859 10,101
Net income 59,148 21,865 30,307
Other comprehensive (loss) income, net of tax:      
Defined benefit pension plan adjustments; net of tax expense (benefit) of $(159), $(238) and $226 (473) (622) 679
Comprehensive income $ 58,675 $ 21,243 $ 30,986
Common Stock [Member]      
Basic earnings per share:      
Basic earnings per share (in dollars per share) $ 3.18 $ 1.10 $ 1.45
Diluted earnings per share:      
Diluted earnings per share (in dollars per share) 3.12 1.08 1.42
Common Stock [Member] | Class A Common Stock [Member]      
Basic earnings per share:      
Basic earnings per share (in dollars per share) 3.04 1.04 1.39
Diluted earnings per share:      
Diluted earnings per share (in dollars per share) $ 3.04 $ 1.03 $ 1.39