Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Measurements

Recurring Fair Value Measurements

	Fair Value as of December 31, 2013
	Level 1		Level 2		Level 3		Total
	(In thousands)
Assets:
Short-term investments:
Available-for-sale equity securities from energy industry	$	96,080	$	862	$	—	$	96,942
Available-for-sale debt securities:
Corporate debt securities		—		19,388		—		19,388
Mortgage-backed debt securities		—		210		—		210
Mortgage-CMO debt securities		—		20		—		20
Asset-backed debt securities		658		—		—		658
Total short-term investments	$	96,738	$	20,480	$	—	$	117,218

Fair Value of Financial Instruments

	December 31,
	2013							2012
	Effective Interest Rate			Carrying Value		Fair Value		Effective Interest Rate			Carrying Value		Fair Value
	(In thousands)
2.35% senior notes due September 2016		2.56	%	$	349,820	$	354,694		6.42	%	$	—	$	—
6.15% senior notes due February 2018		6.42	%		969,928		1,097,480		6.42	%		968,708		1,164,813
9.25% senior notes due January 2019		9.33	%		339,607		428,733		9.33	%		1,125,000		1,492,819
5.00% senior notes due September 2020		5.20	%		697,947		731,955		5.20	%		697,648		770,707
4.625% senior notes due September 2021		4.75	%		698,148		709,793		4.75	%		697,907		755,517
5.10% senior notes due September 2023		5.26	%		348,765		349,731		0.00	%		—		—
Subsidiary preferred stock		4.00	%		69,188		69,000		4.00	%		69,188		68,625
Revolving credit facilities		2.28	%		170,000		170,000		2.17	%		890,000		890,000
Commercial paper		0.45	%		329,844		329,844		0.00	%		—		—
Other		0.00	%		10,243		10,243		0.00	%		437		437
Total				$	3,983,490	$	4,251,473				$	4,448,888	$	5,142,918