QUARTERLY FINANCIAL INFORMATION - UNAUDITED (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
QUARTERLY FINANCIAL INFORMATION - UNAUDITED
Net sales	$ 1,270,200	$ 1,357,900	$ 1,370,200	$ 1,324,400	$ 1,248,800	$ 1,294,300	$ 1,270,200	$ 1,021,700	$ 5,322,670	$ 4,835,042	$ 3,514,586
Gross profit	218,700	223,700	238,000	229,800	231,100	242,300	234,000	185,800	910,196	893,192	700,174
Net income	$ 22,800	$ 55,900	$ 54,200	$ 51,200	$ 53,300	$ 61,400	$ 59,600	$ 30,800	$ 184,081	$ 205,111	$ 147,221
Basic earnings per common share (in dollars per share)	$ 0.22	$ 0.53	$ 0.51	$ 0.47	$ 0.48	$ 0.55	$ 0.54	$ 0.28	$ 1.73	$ 1.85	$ 1.38
Diluted earnings per common share (in dollars per share)	$ 0.22	$ 0.53	$ 0.51	$ 0.47	$ 0.48	$ 0.55	$ 0.54	$ 0.28	$ 1.73	$ 1.85	$ 1.38