Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value Measurements [Abstract]

Recurring Fair Value Measurements

	Fair Value as of December 31, 2011
	Level 1		Level 2		Level 3		Total
	(In thousands)
Assets:
Short-term investments:
Available-for-sale equity securities — energy industry	$	60,923	$	10,510	$	—	$	71,433
Available-for-sale debt securities
Commercial paper and CDs		1,230		—		—		1,230
Corporate debt securities		—		51,300		—		51,300
Mortgage-backed debt securities		—		309		—		309
Mortgage-CMO debt securities		—		2,547		—		2,547
Asset-backed debt securities		2,495		—		—		2,495
Trading securities — energy industry		11,600		—		—		11,600
Total short-term investments	$	76,248	$	64,666	$	—	$	140,914
Liabilities:
Derivative contract	$	—	$	1,281	$	—	$	1,281

Fair Value of Financial Instruments

	December 31,
	2011				2010
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(In thousands)
5.375% senior notes due August 2012(1)	$	274,604	$	281,188	$	273,977	$	291,500
6.15% senior notes due February 2018		967,490		1,113,986		966,276		1,041,008
9.25% senior notes due January 2019		1,125,000		1,419,514		1,125,000		1,393,943
5.00% senior notes due September 2020		697,343		734,475		697,037		678,335
4.625% senior notes due September 2021		697,667		708,176		—		—
0.94% senior exchangeable notes due May 2011		—		—		1,378,178		1,403,315
Subsidiary preferred stock		69,188		68,625		69,188		68,625
Revolving credit facilities		860,000		860,000		—		—
Other		1,712		1,712		2,676		2,676
	$	4,693,004	$	5,187,676	$	4,512,332	$	4,879,402

(1) Includes $.3 million and $.7 million as of December 31, 2011 and 2010, respectively, related to the unamortized loss on the interest rate swap that was unwound during the fourth quarter of 2005.