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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net sales $ 198,775 $ 196,829 $ 398,218 $ 397,257
Cost of goods sold 90,978 89,710 181,514 180,542
Gross profit 107,797 107,119 216,704 216,715
Credit service charges 25 42 57 87
Gross profit and other revenue 107,822 107,161 216,761 216,802
Expenses:        
Selling, general and administrative 98,753 96,837 199,756 197,212
Provision for doubtful accounts 22 61 24 163
Other expense (income), net 183 4 (811) (1,155)
Total expenses 98,958 96,902 198,969 196,220
Income before interest and income taxes 8,864 10,259 17,792 20,582
Interest expense, net 454 565 925 1,148
Income before income taxes 8,410 9,694 16,867 19,434
Income tax expense 2,196 3,509 4,340 7,263
Net income 6,214 6,185 12,527 12,171
Other comprehensive income        
Adjustments related to retirement plan; net of tax expense of $9 and $18 in 2018 and 2017 25 11 50 27
Comprehensive income $ 6,239 $ 6,196 $ 12,577 $ 12,198
Common Stock [Member]        
Basic earnings per share:        
Common Stock (in dollars per share) $ 0.30 $ 0.29 $ 0.60 $ 0.58
Diluted earnings per share:        
Common Stock (in dollars per share) 0.29 0.29 0.58 0.56
Cash dividends per share:        
Common Stock (in dollars per share) 0.18 0.12 0.36 0.24
Class A Common Stock [Member]        
Basic earnings per share:        
Common Stock (in dollars per share) 0.28 0.28 0.56 0.55
Diluted earnings per share:        
Common Stock (in dollars per share) 0.28 0.27 0.56 0.54
Cash dividends per share:        
Common Stock (in dollars per share) $ 0.17 $ 0.1125 $ 0.34 $ 0.2250