Fair Value Of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Disclosures [Abstract]

Fair Value, Assets And Liabilities Measured On Recurring Basis

The following table summarizes the Company's financial assets and liabilities measured at fair value on a recurring basis as of March 31, 2012 and December 31, 2011:

			Fair Value Measurement Using
	Total Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In thousands)
As of March 31, 2012:
Assets:
Investments in money market funds	$	333,165	$	333,165	$	—	$	—
Investments in fixed income securities:
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	32,803		—		32,803		—
Foreign currency forward contracts (1)	251		—		251		—
Total	$	366,219	$	333,165	$	33,054	$	—
Liabilities:
Contingent interest derivative on Convertible Debentures	$	12,438	$	—	$	—	$	12,438
Foreign currency forward contracts (2)	372		—		372		—
Total	$	12,810	$	—	$	372	$	12,438
As of December 31, 2011:
Assets:
Investments in money market funds	$	132,145	$	132,145	$	—	$	—
Investments in fixed income securities:
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	32,860		—		32,860		—
Foreign currency forward contracts (1)	49		—		49		—
Total	$	165,054	$	132,145	$	32,909	$	—
Liabilities:
Contingent interest derivative on Convertible Debentures	$	11,625	$	—	$	—	$	11,625
Foreign currency forward contracts (2)	444		—		444		—
Total	$	12,069	$	—	$	444	$	11,625

(1) Included in Deferred tax assets and other current assets

(2) Included in Accounts payable and accrued liabilities

Changes In Fair Value Measurement Of Level 3 Items

	Three Months Ended March 31,
	2012		2011
	(In thousands)
Beginning balance	$	11,625	$	10,500
Unrealized loss on contingent interest derivative on Convertible Debentures	813		450
Ending balance	$	12,438	$	10,950