Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2011

Financial Instruments [Abstract]

Cash And Cash Equivalents And Investments From Continuing Operations

	September 30, 2011
			(Dollars in thousands) Gross Unrealized
	Cost		Gain		(Loss)			Fair Value
Cash and cash equivalents:
Cash	$	203,260	$	—	$	—		$	203,260
Money market funds		85,390		451		—			85,841
Total cash and cash equivalents		288,650		451		—			289,101
Short-term investments (available-for-sale):
U.S. Treasury bills		159,923		62		(14	)		159,971
Total cash and cash equivalents and short-term investments	$	448,573	$	513	$	(14	)	$	449,072
Long-term investments:
Municipal bonds	$	11,750	$	—	$	(673	)	$	11,077
	December 31, 2010
			(Dollars in thousands) Gross Unrealized
	Cost		Gain		(Loss)			Fair Value
Cash and cash equivalents:
Cash	$	176,250	$	—	$	—		$	176,250
Money market funds		112,936		296		—			113,232
Total cash and cash equivalents		289,186		296		—			289,482
Short-term investments (available-for-sale):
U.S. Treasury bills		159,672		7		(8	)		159,671
Total cash and cash equivalents and short-term investments	$	448,858	$	303	$	(8	)	$	449,153
Long-term investments:
Municipal bonds	$	11,750	$	—	$	(439	)	$	11,311

Investments Measured At Fair Value On A Recurring Basis

	As of September 30, 2011
	(Dollars in thousands)
	Level 1		Level 2		Level 3		Total
Municipal bonds	$	—	$	—	$	11,077	$	11,077
U.S. Treasury bills		159,971		—		—		159,971
Totals	$	159,971	$	—	$	11,077	$	171,048
	As of December 31, 2010
	(Dollars in thousands)
	Level 1		Level 2		Level 3		Total
Municipal bonds	$	—	$	—	$	11,311	$	11,311
U.S. Treasury bills		159,671		—		—		159,671
Totals	$	159,671	$	—	$	11,311	$	170,982

Assets Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)

	(Dollars in thousands)
Balance at December 31, 2010	$	11,311
Unrealized loss		(234	)
Balance at September 30, 2011	$	11,077