Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Measurements

Recurring Fair Value Measurements

	Fair Value as of March 31, 2015
	Level 1		Level 2		Level 3		Total
	(In thousands)
Assets:
Short-term investments:
Available-for-sale equity securities (energy industry)	$	35,152	$	—	$	—	$	35,152
Available-for-sale debt securities:
Mortgage-CMO debt securities	—		18		—		18
Total short-term investments	$	35,152	$	18	$	—	$	35,170

Fair Value of Financial Instruments

	March 31, 2015				December 31, 2014
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(In thousands)
2.35% senior notes due September 2016	$	349,904	$	349,213	$	349,887	$	346,980
6.15% senior notes due February 2018	931,000		997,517		930,693		991,920
9.25% senior notes due January 2019	339,607		400,118		339,607		403,531
5.00% senior notes due September 2020	698,329		697,669		698,253		687,953
4.625% senior notes due September 2021	698,448		680,008		698,388		661,619
5.10% senior notes due September 2023	348,925		335,129		348,893		332,759
Revolving credit facility	200,000		200,000		450,000		450,000
Commercial paper	250,504		250,504		533,119		533,119
Other	8,739		8,739		6,209		6,209
Total	$	3,825,456	$	3,918,897	$	4,355,049	$	4,414,090