Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net sales	[1]	$ 1,808,376	$ 1,775,125	$ 1,794,962
Cost of sales		1,259,284	1,257,891	1,287,023
Gross profit		549,092	517,234	507,939
Selling, general and administrative expenses		443,158	413,043	397,199
Net loss (gain) on sale of assets		11	(328)	233
Operating income from continuing operations		105,923	104,519	110,507
Interest expense, net		15,747	13,144	13,382
Other expense, net		472	3,386	623
Earnings from continuing operations before income taxes		89,704	87,989	96,502
Income tax expense		30,850	27,551	30,722
Earnings from continuing operations		58,854	60,438	65,780
Loss from discontinued operations, net of taxes		0	0	(2,924)
Loss on disposal of discontinued operations, net of taxes		0	0	(4,984)
Total loss from discontinued operations		0	0	(7,908)
Net earnings		$ 58,854	$ 60,438	$ 57,872
Earnings per share:
Basic earnings per share from continuing operations (in dollars per share)		$ 2.17	$ 2.22	$ 2.43
Basic loss per share from discontinued operations (in dollars per share)		0.00	0.00	(0.11)
Basic loss per share from disposal of discontinued operations (in dollars per share)		0.00	0.00	(0.18)
Basic earnings per share (in dollars per share)		2.17	2.22	2.14
Diluted earnings per share from continuing operations (in dollars per share)		2.10	2.17	2.37
Diluted loss per share from discontinued operations (in dollars per share)		0.00	0.00	(0.11)
Diluted loss per share from disposal of discontinued operations (in dollars per share)		0.00	0.00	(0.18)
Diluted earnings per share (in dollars per share)		$ 2.10	$ 2.17	$ 2.08
Weighted average shares outstanding:
Basic (in shares)		27,107	27,177	27,053
Diluted (in shares)		28,072	27,868	27,777
Dividends declared per share (in dollars per share)		$ 0.72	$ 0.72	$ 0.64

[1] Service revenue was not material for the years ended December 31, 2016, 2015 and 2014.