Cash and Cash Equivalents (Tables)

12 Months Ended

Dec. 31, 2011

Cash and Cash Equivalents [Abstract]

Schedule of Cash and Cash Equivalents [Table Text Block]

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