CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net sales	$ 913,958	$ 925,049	$ 1,948,825	$ 1,792,301
Cost of sales	712,062	757,954	1,574,292	1,457,622
Gross profit	201,896	167,095	374,533	334,679
Selling, general and administrative expenses	30,918	28,726	57,930	55,673
Income from operations	170,978	138,369	316,603	279,006
Other income (expense)
Interest expense	(11,571)	(12,802)	(23,748)	(25,722)
Gain from sales of equity securities	15,952		15,952
Other income, net	1,107	1,632	2,454	2,839
Income before income taxes	176,466	127,199	311,261	256,123
Provision for income taxes	60,965	46,150	107,947	91,530
Net income	$ 115,501	$ 81,049	$ 203,314	$ 164,593
Earnings per share:
Basic	$ 1.73	$ 1.22	$ 3.05	$ 2.48
Diluted	$ 1.72	$ 1.21	$ 3.03	$ 2.46
Weighted average shares outstanding:
Basic	66,298,633	65,999,090	66,203,965	65,873,023
Diluted	66,648,896	66,425,065	66,603,706	66,269,823
Dividends per common share	$ 0.0738	$ 0.0635	$ 0.1475	$ 0.1270