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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net sales $ 194,511 $ 191,331
Cost of goods sold 90,092 88,684
Gross profit 104,419 102,647
Credit service charges 65 72
Gross profit and other revenue 104,484 102,719
Expenses:    
Selling, general and administrative 96,353 92,303
Provision for doubtful accounts 104 23
Other income, net (182) (27)
Total expenses 96,275 92,299
Income before interest and income taxes 8,209 10,420
Interest expense, net 622 492
Income before income taxes 7,587 9,928
Income tax expense 2,918 3,809
Net income 4,669 6,119
Other comprehensive income    
Adjustments related to retirement plans; net of tax expense of $11 and $31 19 50
Comprehensive income $ 4,688 $ 6,169
Common Stock [Member]    
Basic earnings per share:    
Common Stock (in dollars per share) $ 0.21 $ 0.27
Diluted earnings per share:    
Common Stock (in dollars per share) 0.21 0.27
Cash dividends per share:    
Common Stock (in dollars per share) 0.100 0.080
Class A Common Stock [Member]    
Basic earnings per share:    
Common Stock (in dollars per share) 0.20 0.26
Diluted earnings per share:    
Common Stock (in dollars per share) 0.20 0.25
Cash dividends per share:    
Common Stock (in dollars per share) $ 0.095 $ 0.075