QUARTERLY FINANCIAL DATA (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
QUARTERLY FINANCIAL DATA (Unaudited)
Net Sales	$ 471,517	$ 541,940	$ 592,640	$ 454,605	$ 409,957	$ 474,709	$ 462,145	$ 356,419	$ 2,060,702	$ 1,703,230	$ 1,303,942
Gross Profit	243,887	273,592	307,008	241,169	214,244	250,307	244,221	185,537	1,065,656	894,309	680,240
Net Income	$ 67,984	$ 86,142	$ 109,795	$ 76,099	$ 64,536	$ 82,392	$ 84,248	$ 55,043	$ 340,020	$ 286,219	$ 212,029
Net Income per Common Share
Basic (in dollars per share)	$ 0.40	$ 0.49	$ 0.62	$ 0.44	$ 0.37	$ 0.47	$ 0.48	$ 0.31	$ 1.96	$ 1.62	$ 1.20
Diluted (in dollars per share)	$ 0.39	$ 0.47	$ 0.59	$ 0.41	$ 0.35	$ 0.44	$ 0.45	$ 0.29	$ 1.86	$ 1.53	$ 1.14