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Consolidated Statements of COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net sales $ 819,866 $ 821,571 $ 804,870
Cost of goods sold 374,943 378,234 374,094
Gross profit 444,923 443,337 430,776
Credit service charges 161 229 286
Gross profit and other revenue 445,084 443,566 431,062
Expenses:      
Selling, general and administrative 402,884 399,236 384,801
Provision for doubtful accounts 224 383 314
Other income, net (3,358) (4,107) (1,617)
Total expenses 399,750 395,512 383,498
Income before interest and income taxes 45,334 48,054 47,564
Interest expense, net 2,111 2,233 2,289
Income before income taxes 43,223 45,821 45,275
Income tax expense 22,148 17,465 17,486
Net income 21,075 28,356 27,789
Other comprehensive (loss) income, net of tax:      
Defined benefit pension plans adjustments; net of tax expense (benefit) of $105, $66 and $141 (314) 108 230
Comprehensive income $ 20,761 $ 28,464 $ 28,019
Common Stock [Member]      
Basic earnings per share:      
Common Stock (in dollars per share) $ 1.00 $ 1.32 $ 1.24
Diluted earnings per share:      
Common Stock (in dollars per share) 0.98 1.30 1.22
Class A Common Stock [Member]      
Basic earnings per share:      
Common Stock (in dollars per share) 0.95 1.27 1.18
Diluted earnings per share:      
Common Stock (in dollars per share) $ 0.94 $ 1.27 $ 1.17