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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net sales $ 200,427 $ 194,511
Cost of goods sold 90,831 90,092
Gross profit 109,596 104,419
Credit service charges 45 65
Gross profit and other revenue 109,641 104,484
Expenses:    
Selling, general and administrative 100,374 96,353
Provision for doubtful accounts 102 104
Other (income) expense, net (1,158) (182)
Total expenses 99,318 96,275
Income before interest and income taxes 10,323 8,209
Interest expense, net 583 622
Income before income taxes 9,740 7,587
Income tax expense 3,754 2,918
Net income 5,986 4,669
Other comprehensive income    
Adjustments related to retirement plans; net of tax expense of $9 and $11 16 19
Comprehensive income $ 6,002 $ 4,688
Common Stock [Member]    
Basic earnings per share:    
Common Stock (in dollars per share) $ 0.28 $ 0.21
Diluted earnings per share:    
Common Stock (in dollars per share) 0.28 0.21
Cash dividends per share:    
Common Stock (in dollars per share) 0.1200 0.100
Class A Common Stock [Member]    
Basic earnings per share:    
Common Stock (in dollars per share) 0.27 0.20
Diluted earnings per share:    
Common Stock (in dollars per share) 0.27 0.20
Cash dividends per share:    
Common Stock (in dollars per share) $ 0.1125 $ 0.095