Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Net revenue	$ 2,422,167	$ 2,305,858	$ 4,813,363	$ 4,562,239
Cost of goods sold	2,123,830	2,023,586	4,217,425	3,998,771
Gross margin	298,337	282,272	595,938	563,468
Selling, general and administrative expenses	231,498	225,838	465,323	451,448
Acquisition-related and exit and realignment charges	5,707	7,593	15,623	10,855
Depreciation and amortization	15,460	13,892	31,329	27,756
Other operating income, net	(2,188)	(2,152)	(5,172)	(9,978)
Operating earnings	47,860	37,101	88,835	83,387
Interest expense, net	6,680	3,342	13,560	6,589
Income before income taxes	41,180	33,759	75,275	76,798
Income tax provision	16,954	13,883	32,109	31,436
Net income	$ 24,226	$ 19,876	$ 43,166	$ 45,362
Net income per common share:
Basic (in usd per share)	$ 0.39	$ 0.32	$ 0.69	$ 0.72
Diluted (in usd per share)	0.39	0.32	0.69	0.72
Cash dividends in USD per common share	$ 0.2525	$ 0.25	$ 0.505	$ 0.5