Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Measurements

Recurring Fair Value Measurements

	Fair Value as of March 31, 2013
	Level 1		Level 2		Level 3		Total
	(In thousands)
Assets:
Short-term investments:
Available-for-sale equity securities from energy industry	$	96,256	$	862	$	—	$	97,118
Available-for-sale debt securities:
Commercial paper and CDs	88		—		—		88
Corporate debt securities	—		26,550		—		26,550
Mortgage-backed debt securities	—		218		—		218
Mortgage-CMO debt securities	—		253		—		253
Asset-backed debt securities	1,365		—		—		1,365
Total short-term investments	$	97,709	$	27,883	$	—	$	125,592

Fair Value of Financial Instruments

	March 31, 2013				December 31, 2012
	Carrying  Value		Fair Value		Carrying Value		Fair Value
	(In thousands)
6.15% senior notes due February 2018	$	969,012	$	1,114,620	$	968,708	$	1,164,813
9.25% senior notes due January 2019	1,125,000		1,451,846		1,125,000		1,492,819
5.00% senior notes due September 2020	697,724		744,198		697,648		770,707
4.625% senior notes due September 2021	697,967		705,810		697,907		755,517
Subsidiary preferred stock	69,188		68,625		69,188		68,625
Revolving credit facility	890,000		890,000		890,000		890,000
Other	490		490		437		437
	$	4,449,381	$	4,975,589	$	4,448,888	$	5,142,918