Condensed Consolidated Statements of Income (Unaudited) - 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 sales	$ 923,632	$ 837,926	$ 1,834,773	$ 1,668,149
Cost of goods sold	597,474	552,666	1,200,041	1,109,675
Gross profit	326,158	285,260	634,732	558,474
Operating expenses:
Selling, distribution, and marketing	174,311	156,910	342,072	304,301
General and administrative	74,845	61,630	145,589	133,916
Asset disposal and exit costs	0	(55)	0	(703)
Total operating expenses	249,156	218,485	487,661	437,514
Operating income	77,002	66,775	147,071	120,960
Other expense:
Interest expense	13,933	7,512	22,600	13,234
Other expense, net	988	3,548	4,787	4,356
Total other expense	14,921	11,060	27,387	17,590
Income before income taxes	62,081	55,715	119,684	103,370
Income tax expense	22,214	20,766	42,396	36,061
Income before loss in equity method investments	39,867	34,949	77,288	67,309
Loss in equity method investments	2,423	542	6,497	542
Net income	$ 37,444	$ 34,407	$ 70,791	$ 66,767
Weighted average common shares:
Basic (in shares)	175,317,750	173,966,917	175,007,291	173,796,646
Diluted (in shares)	180,044,401	177,589,222	179,662,304	177,200,630
Net income per share:
Basic (in dollars per share)	$ 0.21	$ 0.20	$ 0.40	$ 0.38
Diluted (in dollars per share)	$ 0.21	$ 0.19	$ 0.39	$ 0.38