Financial Instruments and Fair Value Disclosures (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis

December 31, 2013
	Fair Value Measurements Using							Assets at Fair Value			Total Losses for Year Ended
	Level 1		Level 2			Level 3
	(In thousands)
Recurring fair value measurements:
Assets:
Short-term investments	$	2,061,154	$	—		$	—	$	2,061,154		$	—
FOREX contracts		—		1,562			—		1,562			—
Mortgage-backed securities		—		197			—		197			—
Total assets	$	2,061,154	$	1,759		$	—	$	2,062,913		$	—
Liabilities:
FOREX contracts	$	—	$	(1,143	)	$	—	$	(1,143	)	$	—
Nonrecurring fair value measurements:
Assets:
Impaired assets	$	—	$	—		$	3,900	$	3,900		$	—

	December 31, 2012
	Fair Value Measurements Using							Assets at Fair Value			Total Losses for Year Ended
	Level 1		Level 2			Level 3
	(In thousands)
Recurring fair value measurements:
Assets:
Short-term investments	$	1,434,751	$	—		$	—	$	1,434,751		$	—
FOREX contracts		—		3,627			—		3,627			—
Mortgage-backed securities		—		301			—		301			—
Total assets	$	1,434,751	$	3,928		$	—	$	1,438,679		$	—
Liabilities:
FOREX contracts	$	—	$	(29	)	$	—	$	(29	)	$	—
Nonrecurring fair value measurements:
Assets:
Assets held for sale	$	—	$	—		$	3,900	$	3,900		$	(62,437	)

Fair Values and Related Carrying Values of Our Debt Instruments

Fair values and related carrying values (see Note 9) of our senior notes are shown below.

	December 31, 2013				December 31, 2012
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In millions)
5.15% Senior Notes due 2014	$	257.4	$	250.0	$	269.0	$	249.9
4.875% Senior Notes due 2015		265.7		249.9		275.5		249.8
5.875% Senior Notes due 2019		578.1		499.6		617.1		499.5
3.45% Senior Notes due 2023		241.4		249.0		—		—
5.70% Senior Notes due 2039		543.1		496.9		641.4		496.9
4.875% Senior Notes due 2043		736.1		748.8		—		—