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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net sales $ 817,733 $ 819,866 $ 821,571
Cost of goods sold 371,191 374,943 378,234
Gross profit 446,542 444,923 443,337
Credit service charges 103 161 229
Gross profit and other revenue 446,645 445,084 443,566
Expenses:      
Selling, general and administrative 404,856 402,884 399,236
Provision for doubtful accounts 68 224 383
Other income, net (110) (3,358) (4,107)
Total expenses 404,814 399,750 395,512
Income before interest and income taxes 41,831 45,334 48,054
Interest expense, net 1,423 2,111 2,233
Income before income taxes 40,408 43,223 45,821
Income tax expense 10,101 22,148 17,465
Net income 30,307 21,075 28,356
Other comprehensive income (loss), net of tax:      
Defined benefit pension plans adjustments; net of tax expense (benefit) 679 (314) 108
Comprehensive income $ 30,986 $ 20,761 $ 28,464
Common Stock [Member]      
Basic earnings per share:      
Common Stock (in dollars per share) $ 1.45 $ 1.00 $ 1.32
Diluted earnings per share:      
Common Stock (in dollars per share) 1.42 0.98 1.30
Class A Common Stock [Member]      
Basic earnings per share:      
Common Stock (in dollars per share) 1.39 0.95 1.27
Diluted earnings per share:      
Common Stock (in dollars per share) $ 1.39 $ 0.94 $ 1.27