Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Measurements

Recurring Fair Value Measurements

	Fair Value as of June 30, 2015
	Level 1		Level 2		Level 3		Total
	(In thousands)
Assets:
Short-term investments:
Available-for-sale equity securities (energy industry)	$	33,205	$	—	$	—	$	33,205
Available-for-sale debt securities:
Mortgage-CMO debt securities	—		17		—		17
Total short-term investments	$	33,205	$	17	$	—	$	33,222

Fair Value of Financial Instruments

	June 30, 2015				December 31, 2014
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(In thousands)
2.35% senior notes due September 2016	$	349,921	$	351,964	$	349,887	$	346,980
6.15% senior notes due February 2018	931,307		1,007,645		930,693		991,920
9.25% senior notes due January 2019	339,607		411,852		339,607		403,531
5.00% senior notes due September 2020	698,406		727,181		698,253		687,953
4.625% senior notes due September 2021	698,508		699,923		698,388		661,619
5.10% senior notes due September 2023	348,957		350,091		348,893		332,759
Revolving credit facility	—		—		450,000		450,000
Commercial paper	324,652		324,652		533,119		533,119
Other	66,358		66,358		6,209		6,209
Total	$	3,757,716	$	3,939,666	$	4,355,049	$	4,414,090