Debt (Tables)

3 Months Ended

Mar. 31, 2013

Debt [Abstract]

Components Of Debt

	March 31,		December 31,
	2013		2012
	(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 (2.18% at March 31, 2013) unsecured revolving credit facility		35,100		–
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		29,400		29,400
4.10% Senior Notes due 2022		1,000,000		1,000,000
Unamortized discount		(1,097)		(1,127)
Total long-term debt		1,703,403		1,668,273
Total debt	$	1,704,603	$	1,669,473