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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net sales $ 211,690 $ 209,921 $ 600,976 $ 588,984
Cost of goods sold 97,953 98,179 278,660 274,413
Gross profit 113,737 111,742 322,316 314,571
Credit service charges 54 71 173 213
Gross profit and other revenue 113,791 111,813 322,489 314,784
Expenses:        
Selling, general and administrative 101,745 98,720 294,809 283,767
Provision for doubtful accounts 70 83 286 167
Other (income) expense, net (705) 2 (2,799) (945)
Total expenses 101,110 98,805 292,296 282,989
Income before interest and income taxes 12,681 13,008 30,193 31,795
Interest expense, net 556 594 1,719 1,614
Income before income taxes 12,125 12,414 28,474 30,181
Income tax expense 4,759 4,759 11,065 11,574
Net income 7,366 7,655 17,409 18,607
Other comprehensive income        
Adjustments related to retirement plans; net of tax expense of $12 and $34 in 2016 and $36 and $109 in 2015 18 59 56 175
Comprehensive income $ 7,384 $ 7,714 $ 17,465 $ 18,782
Common Stock [Member]        
Basic earnings per share:        
Common Stock (in dollars per share) $ 0.35 $ 0.34 $ 0.81 $ 0.83
Diluted earnings per share:        
Common Stock (in dollars per share) 0.34 0.34 0.79 0.81
Cash dividends per share:        
Common Stock (in dollars per share) 0.1200 0.100 0.3200 0.260
Class A Common Stock [Member]        
Basic earnings per share:        
Common Stock (in dollars per share) 0.33 0.32 0.77 0.78
Diluted earnings per share:        
Common Stock (in dollars per share) 0.33 0.32 0.76 0.78
Cash dividends per share:        
Common Stock (in dollars per share) $ 0.1125 $ 0.095 $ 0.3025 $ 0.245