Credit Agreement and Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Long-Term Debt

Our long-term debt is comprised as follows:

Name of Issue	Aggregate Principal Amount (In millions)	Maturity Date	Stated Interest Rate	Semiannual Interest Payment Dates
5.15% Senior Notes	$250.0	September 1, 2014	5.15%	March 1 and September 1
4.875% Senior Notes	$250.0	July 1, 2015	4.875%	January 1 and July 1
5.875% Senior Notes	$500.0	May 1, 2019	5.875%	May 1 and November 1
5.70% Senior Notes	$500.0	October 15, 2039	5.70%	April 15 and October 15

Long-Term Debt

At December 31, 2012 and 2011, the carrying value of our long-term debt was as follows:

	December 31,
	2012		2011
	(In thousands)
5.15% Senior Notes	$	249,882	$	249,811
4.875% Senior Notes		249,837		249,779
5.875% Senior Notes		499,480		499,414
5.70% Senior Notes		496,867		496,819
Total long-term debt	$	1,496,066	$	1,495,823

Aggregate Maturities of Long-Term Debt

As of December 31, 2012, the aggregate annual maturity of our long-term debt was as follows:

	Aggregate Principal Amount
Years Ending December 31,	(In thousands)
2013	$	--
2014		250,000
2015		250,000
2016		--
2017		--
Thereafter		1,000,000
Total maturities of long-term debt, excluding unamortized discounts		1,500,000
Total unamortized discounts		(3,934)
Total long-term debt	$	1,496,066