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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net sales $ 199,442 $ 200,427
Cost of goods sold 90,535 90,831
Gross profit 108,907 109,596
Credit service charges 32 45
Gross profit and other revenue 108,939 109,641
Expenses:    
Selling, general and administrative 101,004 100,374
Provision for doubtful accounts 2 102
Other (income) expense, net (995) (1,158)
Total expenses 100,011 99,318
Income before interest and income taxes 8,928 10,323
Interest expense, net 471 583
Income before income taxes 8,457 9,740
Income tax expense 2,144 3,754
Net income 6,313 5,986
Other comprehensive income    
Adjustments related to retirement plans; net of tax expense of $9 in 2018 and 2017 25 16
Comprehensive income $ 6,338 $ 6,002
Common Stock [Member]    
Basic earnings per share:    
Common Stock (in dollars per share) $ 0.30 $ 0.28
Diluted earnings per share:    
Common Stock (in dollars per share) 0.29 0.28
Cash dividends per share:    
Common Stock (in dollars per share) 0.18 0.1200
Class A Common Stock [Member]    
Basic earnings per share:    
Common Stock (in dollars per share) 0.28 0.27
Diluted earnings per share:    
Common Stock (in dollars per share) 0.28 0.27
Cash dividends per share:    
Common Stock (in dollars per share) $ 0.17 $ 0.1125