Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Measurements

Recurring Fair Value Measurements

	Fair Value as of June 30, 2013
	Level 1		Level 2		Level 3		Total
	(In thousands)
Assets:
Short-term investments:
Available-for-sale equity securities from energy industry	$	77,800	$	862	$	—	$	78,662
Available-for-sale debt securities:
Corporate debt securities	—		19,685		—		19,685
Mortgage-backed debt securities	—		216		—		216
Mortgage-CMO debt securities	—		209		—		209
Asset-backed debt securities	1,060		—		—		1,060
Total short-term investments	$	78,860	$	20,972	$	—	$	99,832

Fair Value of Financial Instruments

	June 30, 2013				December 31, 2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(In thousands)
6.15% senior notes due February 2018	$	969,318	$	1,082,328	$	968,708	$	1,164,813
9.25% senior notes due January 2019	1,111,000		1,383,806		1,125,000		1,492,819
5.00% senior notes due September 2020	697,795		717,535		697,648		770,707
4.625% senior notes due September 2021	698,027		696,367		697,907		755,517
Subsidiary preferred stock	69,188		70,500		69,188		68,625
Revolving credit facility	300,000		300,000		890,000		890,000
Commercial paper	295,000		295,000		—		—
Other	11,496		11,496		437		437
	$	4,151,824	$	4,557,032	$	4,448,888	$	5,142,918