Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2012

Long-Term Debt [Abstract]

Long-term debt

Long-term debt consisted of the following:

( in thousands )			As of
	September 30,		December 31,
	2012		2011
3.55% senior notes due in 2015	$	884,657	$	884,545
2.70% senior notes due in 2016		499,491		499,400
Total long-term debt	$	1,384,148	$	1,383,945
Fair value of long-term debt*	$	1,456,506	$	1,428,653
*The fair value of the long-term senior notes were estimated using level 2 inputs comprised of quoted prices in active markets, market indices
and interest rate measurements for debt of the same remaining maturity.