Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value Disclosures [Abstract]

Valuation of money market funds and restricted cash using quoted market prices in active markets for identical assets

Money market funds and restricted cash are valued using quoted market prices in active markets for identical assets as summarized in the following tables as of December 31, 2011 and 2010:

	December 31, 2011
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(In thousands)
Cash equivalent money market funds	$	165,540	$	—	$	—	$	165,540
Restricted cash money market funds	2,680		—		—		2,680

	December 31, 2010
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(In thousands)
Cash equivalent money market funds	$	145,827	$	—	$	—	$	145,827
Restricted cash money market funds	17,782		—		—		17,782

Financial instruments that are not recorded at fair value

The following table presents the carrying amounts and fair values of financial instruments that are not recorded at fair value on a recurring basis as of December 31, 2011 and 2010:

	December 31,
	2011		2010
	(In thousands)
Carrying value of debt	$	1,346,651	$	1,364,300
Fair value of debt	$	1,495,353	$	1,806,231