Financial Instruments and Fair Value Disclosures (Tables)

6 Months Ended

Jun. 30, 2012

Financial Instruments and Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value on a recurring basis

	June 30, 2012
	Fair Value Measurements Using							Assets at Fair Value
	Level 1		Level 2			Level 3
	(In thousands)
Assets:
Short-term investments	$	1,331,149	$	—		$	—	$	1,331,149
FOREX contracts		—		2,542			—		2,542
Mortgage-backed securities		—		377			—		377
Total assets	$	1,331,149	$	2,919		$	—	$	1,334,068
Liabilities:
FOREX contracts	$	—	$	(2,792	)	$	—	$	(2,792	)

	December 31, 2011
	Fair Value Measurements Using							Assets at Fair Value
	Level 1		Level 2			Level 3
	(In thousands)
Assets:
Short-term investments	$	1,205,925	$	—		$	—	$	1,205,925
FOREX contracts		—		1,262			—		1,262
Mortgage-backed securities		—		431			—		431
Total assets	$	1,205,925	$	1,693		$	—	$	1,207,618
Liabilities:
FOREX contracts	$	—	$	(8,454	)	$	—	$	(8,454	)

Fair values and related carrying values of our debt instruments

	June 30, 2012				December 31, 2011
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In millions)
4.875% Senior Notes	$	271.9	$	249.8	$	272.9	$	249.8
5.15% Senior Notes		269.0		249.8		272.7		249.8
5.70% Senior Notes		588.5		496.8		555.0		496.8
5.875% Senior Notes		587.8		499.4		575.4		499.4