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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net sales $ 194,774 $ 187,732 $ 389,285 $ 379,063
Cost of goods sold 90,614 87,550 180,706 176,234
Gross profit 104,160 100,182 208,579 202,829
Credit service charges 54 69 119 142
Gross profit and other revenue 104,214 100,251 208,698 202,971
Expenses:        
Selling, general and administrative 96,711 92,744 193,064 185,048
Provision for doubtful accounts 111 61 215 84
Other income, net (1,911) (921) (2,093) (947)
Total expenses 94,911 91,884 191,186 184,185
Income before interest and income taxes 9,303 8,367 17,512 18,786
Interest expense, net 541 528 1,163 1,019
Income before income taxes 8,762 7,839 16,349 17,767
Income tax expense 3,388 3,006 6,306 6,815
Net income 5,374 4,833 10,043 10,952
Other comprehensive income        
Adjustments related to retirement plan; net of tax expense of $11 and $22 in 2016 and $42 and $73 in 2015 19 66 38 116
Comprehensive income $ 5,393 $ 4,899 $ 10,081 $ 11,068
Common Stock [Member]        
Basic earnings per share:        
Common Stock (in dollars per share) $ 0.25 $ 0.21 $ 0.46 $ 0.49
Diluted earnings per share:        
Common Stock (in dollars per share) 0.24 0.21 0.45 0.48
Cash dividends per share:        
Common Stock (in dollars per share) 0.100 0.080 0.200 0.160
Class A Common Stock [Member]        
Basic earnings per share:        
Common Stock (in dollars per share) 0.24 0.20 0.44 0.46
Diluted earnings per share:        
Common Stock (in dollars per share) 0.23 0.20 0.43 0.46
Cash dividends per share:        
Common Stock (in dollars per share) $ 0.095 $ 0.075 $ 0.190 $ 0.150