CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net sales	$ 802,291	$ 817,733	$ 819,866
Cost of goods sold	367,803	371,191	374,943
Gross profit	434,488	446,542	444,923
Credit service charges	79	103	161
Gross profit and other revenue	434,567	446,645	445,084
Expenses:
Selling, general and administrative	407,456	404,856	402,884
Provision for doubtful accounts	90	68	224
Other income, net	(416)	(110)	(3,358)
Total expenses	407,130	404,814	399,750
Income before interest and income taxes	27,437	41,831	45,334
Interest (income) expense, net	(1,287)	1,423	2,111
Income before income taxes	28,724	40,408	43,223
Income tax expense	6,859	10,101	22,148
Net income	21,865	30,307	21,075
Other comprehensive (loss) income, net of tax:
Defined benefit pension plan adjustments; net of tax expense (benefit) of $(238), $226 and $(105)	(622)	679	(314)
Comprehensive income	$ 21,243	$ 30,986	$ 20,761
Common Stock [Member]
Basic earnings per share:
Common Stock (in dollars per share)	$ 1.10	$ 1.45	$ 1.00
Diluted earnings per share:
Common Stock (in dollars per share)	1.08	1.42	0.98
Class A Common Stock [Member]
Basic earnings per share:
Common Stock (in dollars per share)	1.04	1.39	0.95
Diluted earnings per share:
Common Stock (in dollars per share)	$ 1.03	$ 1.39	$ 0.94