Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Net sales	$ 2,079,700	$ 1,953,974	$ 1,793,318
Cost of sales	1,488,423	1,386,567	1,261,728
Gross profit	591,277	567,407	531,590
Selling and administrative expenses	425,791	415,592	404,973
Goodwill impairment	0	6,946	1,550
Operating income	165,486	144,869	125,067
Interest expense, net	6,748	6,469	7,964
Income before income taxes and equity earnings	158,738	138,400	117,103
Provision for income taxes	61,590	56,744	45,319
Equity earnings in unconsolidated investments	182	316	209
Net income	$ 97,330	$ 81,972	$ 71,993
Earnings per share:
Basic (in dollars per share)	$ 2.10	$ 1.75	$ 1.49
Diluted (in dollars per share)	$ 2.05	$ 1.71	$ 1.47
Weighted average shares outstanding:
Basic (in shares)	46,282	46,937	48,158
Diluted (in shares)	47,530	48,058	48,987
Cash dividends declared per common share (in dollars per share)	$ 0.73	$ 0.62	$ 0.55