Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Measurements

Recurring Fair Value Measurements

	Fair Value as of September 30, 2013
	Level 1		Level 2		Level 3		Total
	(In thousands)
Assets:
Short-term investments:
Available-for-sale equity securities from energy industry	$	75,607	$	862	$	—	$	76,469
Available-for-sale debt securities:
Corporate debt securities	—		18,448		—		18,448
Mortgage-backed debt securities	—		213		—		213
Mortgage-CMO debt securities	—		60		—		60
Asset-backed debt securities	825		—		—		825
Total short-term investments	$	76,432	$	19,583	$	—	$	96,015

Fair Value of Financial Instruments

	September 30, 2013				December 31, 2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(In thousands)
2.35% senior notes due September 2016	$	349,803	$	353,959	$	—	$	—
6.15% senior notes due February 2018	969,623		1,097,743		968,708		1,164,813
9.25% senior notes due January 2019	339,607		421,952		1,125,000		1,492,819
5.00% senior notes due September 2020	697,871		732,319		697,648		770,707
4.625% senior notes due September 2021	698,087		717,374		697,907		755,517
5.10% senior notes due September 2023	348,733		356,041		—		—
Subsidiary preferred stock	69,188		69,750		69,188		68,625
Revolving credit facility	300,000		300,000		890,000		890,000
Commercial paper	332,250		332,250		—		—
Other	11,494		11,494		437		437
	$	4,116,656	$	4,392,882	$	4,448,888	$	5,142,918