Fair Value (Tables)

9 Months Ended

Sep. 30, 2011

Fair Value

Financial Assets Measured At Fair Value On A Recurring Basis

			Fair Value Measurements Using
	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)
September 30, 2011
Cash equivalents	$	3,937,536	$	3,937,536	$	0	$	0
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations		880,719		0		880,719		0
Mortgage-backed securities		1,801,652		0		1,801,652		0
Tax-exempt municipal securities		2,725,689		0		2,704,249		21,440
Mortgage-backed securities:
Residential		47,428		0		47,428		0
Commercial		387,911		0		387,911		0
Asset-backed securities		107,453		0		106,388		1,065
Corporate debt securities		3,604,395		0		3,579,918		24,477
Redeemable preferred stock		5,333		0		0		5,333
Total debt securities		9,560,580		0		9,508,265		52,315
Securities lending invested collateral		5,486		5,486		0		0
Total invested assets	$	13,503,602	$	3,943,022	$	9,508,265	$	52,315
December 31, 2010
Cash equivalents	$	1,606,592	$	1,606,592	$	0	$	0
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations		711,613		0		711,613		0
Mortgage-backed securities		1,663,179		0		1,663,179		0
Tax-exempt municipal securities		2,433,334		0		2,381,528		51,806
Mortgage-backed securities:
Residential		55,887		0		55,887		0
Commercial		321,031		0		321,031		0
Asset-backed securities		149,751		0		148,545		1,206
Corporate debt securities		3,032,311		0		3,025,097		7,214
Redeemable preferred stock		5,333		0		0		5,333
Total debt securities		8,372,439		0		8,306,880		65,559
Securities lending invested collateral		49,636		24,639		24,997		0
Total invested assets	$	10,028,667	$	1,631,231	$	8,331,877	$	65,559

Changes In Fair Value Of Assets Measured Using Significant Unobservable Inputs

	For the three months ended September 30,
	2011									2010
	Auction Rate Securities			Private Placements/ Venture Capital			Total			Auction Rate Securities			Private Placements/ Venture Capital			Total
	(in thousands)
Beginning balance at July 1	$	21,054		$	30,529		$	51,583		$	51,473		$	14,541		$	66,014
Total gains or losses:
Realized in earnings		0			11			11			0			19			19
Unrealized in other comprehensive income		486			381			867			(54	)		(34	)		(88	)
Purchases		0			0			0			0			167			167
Sales/calls		(100	)		(46	)		(146	)		0			0			0
Settlements		0			0			0			(50	)		(30	)		(80	)
Balance at September 30	$	21,440		$	30,875		$	52,315		$	51,369		$	14,663		$	66,032
	For the nine months ended September 30,
	2011									2010
	Auction Rate Securities			Private Placements/ Venture Capital			Total			Auction Rate Securities			Private Placements/ Venture Capital			Total
	(in thousands)
Beginning balance at January 1	$	51,806		$	13,753		$	65,559		$	68,814		$	23,909		$	92,723
Total gains or losses:
Realized in earnings		16			(202	)		(186	)		16			6,214			6,230
Unrealized in other comprehensive income		2,243			996			3,239			1,314			(4,239	)		(2,925	)
Purchases		0			17,000			17,000			0			3,334			3,334
Sales/calls		(32,625	)		(672	)		(33,297	)		(2,500	)		(13,220	)		(15,720	)
Settlements		0			0			0			(16,275	)		(1,335	)		(17,610	)
Balance at September 30	$	21,440		$	30,875		$	52,315		$	51,369		$	14,663		$	66,032