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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net sales $ 579,476 $ 592,619 $ 587,670
Cost of sales 364,319 375,719 373,284
Gross margin 215,157 216,900 214,386
Distribution expenses 58,050 57,006 54,815
Selling, general and administrative expenses 140,903 130,397 134,903
Restructuring expenses 1,024 2,420 437
Income from operations 15,180 27,077 24,231
Interest expense (Note F) (4,291) (4,803) (5,746)
Financing expense     (154)
Loss on early retirement of debt (Note F) (110) (272)  
Income before income taxes and equity in earnings 10,779 22,002 18,331
Income tax provision (Note J) (9,032) (7,030) (6,627)
Equity in earnings, net of taxes (Note D) 407 748 574
NET INCOME $ 2,154 $ 15,720 $ 12,278
BASIC INCOME PER COMMON SHARE (NOTE I) $ 0.15 $ 1.11 $ 0.89
DILUTED INCOME PER COMMON SHARE (NOTE I) $ 0.14 $ 1.08 $ 0.86