Debt (Tables)

6 Months Ended

Jun. 30, 2012

Debt [Abstract]

Components Of Debt

	June 30,		December 31,
	2012		2011
	(in thousands)
Short-term debt:
7.15% Senior Notes due 2018	$	1,200	$	1,200
Total short-term debt		1,200		1,200
Long-term debt:
Variable rate (2.200%  and 2.276% at June 30, 2012 and December 31, 2011, respectively) unsecured revolving credit facility, expires February 2016		–		671,500
7.5% Senior Notes due 2018		600,000		600,000
7.35% Senior Notes due 2017		15,000		15,000
7.125% Senior Notes due 2017		25,000		25,000
7.15% Senior Notes due 2018		30,000		30,600
4.10% Senior Notes due 2022		1,000,000		–
Unamortized discount		(1,189)		–
Total long-term debt		1,668,811		1,342,100
Total debt	$	1,670,011	$	1,343,300