Acquisitions (Tables)

3 Months Ended

Mar. 31, 2012

Acquisitions [Abstract]

Summary of pro-forma consolidated financial information

(Thousands of dollars except per share data)
	Three Months Ended
	March 31,
	2012		2011
Net sales	$	2,136,344	$	1,870,978
Net income		100,216		68,349
Net income per common share:
Basic	$	.97	$	.64
Diluted	$	.95	$	.63