Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Measurements [Abstract]

Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]

For recognition purposes, on a recurring basis, the Company measures available for sale short-term and long-term investments at fair value. Approximately $1.7 million of the unrealized losses in short-term investments as of March 31, 2012 have been in a loss position for more than 12 months.  The fair value of the following investments is determined using quoted prices in active markets (Level 1):

	Level 1 Investments  at March 31, 2012
(In thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Short term investments:
Investment funds - debt securities	$	222,794	$	122	$	(2,704	)	$	220,212
Corporate bonds		9,598		9		(3	)		9,604
Total short term investments	$	232,392	$	131	$	(2,707	)	$	229,816
Long term investments:
Corporate bonds	$	6,351	$	14	$	(10	)	$	6,355
	Level 1 Investments  at December 31, 2011
(In thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Short term investments:
Investment funds - debt securities	$	220,778	$	30	$	(4,881	)	$	215,927
Corporate bonds		8,851		1		(7	)		8,845
Total short term investments	$	229,629	$	31	$	(4,888	)	$	224,772