Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements of Income [Abstract]
Product sales	$ 763,272	$ 588,635	$ 2,190,153	$ 1,705,230
Shipping & handling revenues	131,946	99,796	379,815	290,640
Net sales	895,218	688,431	2,569,968	1,995,870
Cost of sales	175,308	133,265	509,124	410,298
Gross Profit	719,910	555,166	2,060,844	1,585,572
Royalty overrides	290,842	224,061	844,451	656,160
Selling, general & administrative expenses	277,721	230,150	788,472	648,143
Operating income	151,347	100,955	427,921	281,269
Interest Income (Expense), Nonoperating, Net	345	2,192	3,848	6,291
Income before income taxes	151,002	98,763	424,073	274,978
Income taxes	42,980	19,879	116,852	62,048
NET INCOME	$ 108,022	$ 78,884	$ 307,221	$ 212,930
Earnings per share:
Basic	$ 0.92	$ 0.67	$ 2.60	$ 1.79
Diluted	$ 0.87	$ 0.63	$ 2.44	$ 1.69
Weighted average shares outstanding:
Basic	116,975	118,442	118,059	119,286
Diluted	124,275	125,613	125,889	126,216
Dividends declared per share	$ 0.20	$ 0.13	$ 0.53	$ 0.33