Cash and Cash Equivalents (Notes)

12 Months Ended

Dec. 31, 2011

Cash and Cash Equivalents [Abstract]

Cash and Cash Equivalents Disclosure [Text Block]

Cash and Cash Equivalents

A summary of cash and cash equivalents follows (in thousands):

	December 31,
	2011		2010
Cash	$	580,047	$	46,639
Money market funds	215		686
U.S. government-backed repurchase agreements	—		447,159
	$	580,262	$	494,484

Repurchase agreements represent investments in U.S. government-backed treasury issues under agreements to resell the securities to the counterparty.  The amounts in the money market funds are shown at fair value based on the quoted market prices of the investments.  The term of the repurchase agreements usually span overnight, but in no case is longer than 30 days.  The Company has a collateralized interest in the underlying securities of repurchase agreements, which are segregated in the accounts of the counterparty.

See additional information at the “Description of Business and Summary of Significant Accounting Policies” and “Fair Value” notes of the Notes to Consolidated Financial statements.