INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2011

INVESTMENTS

Summary of investments in held-to-maturity, available-for-sale and trading securities

September 30, 2011	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value		Continuous Unrealized Loss Position less than 12 Months		Continuous Unrealized Loss Position greater than 12 Months
Held to Maturity
Short-term:
U.S. Treasuries	$	46,140	$	12	$	-	$	46,152	$	-	$	-
Certificates of deposit		33,847		-		-		33,847		-		-
Corporate bonds		2,021		-		-		2,021		-		-
Municipal securities		204,736		-		102		204,634		102		-
U.S. government agency securities		46,013		-		1		46,012		1		-
Available-for-sale
Short-term:
Variable rate demand notes		66,811		-		-		66,811		-		-
Long-term:
Auction rate securities		3,320		-		-		3,320		-		-
Total	$	402,888	$	12	$	103		402,797	$	103	$	-
Trading
Short-term:
Auction rate securities								12,687
Long-term:
Auction rate securities								23,369
Total							$	438,853

December 31, 2010	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value		Continuous Unrealized Loss Position less than 12 Months		Continuous Unrealized Loss Position greater than 12 Months
Held to Maturity
Short-term:
U.S. Treasuries	$	66,521	$	-	$	2	$	66,519	$	2	$	-
Certificates of deposit		7,004		-		-		7,004		-		-
Municipal securities		71,266		-		15		71,251		15		-
U.S. government agency securities		19,688		-		8		19,680		8		-
Available-for-sale
Short-term:
Variable rate demand notes		56,107		-		-		56,107		-		-
Long-term:
Auction rate securities		27,790		-		2,408		25,382		-		2,408
Total	$	248,376	$	-	$	2,433		245,943	$	25	$	2,408
Trading
Short-term:
Auction rate securities								24,063
Long-term:
Auction rate securities								18,807
Total							$	288,813

Summarizes the underlying contractual maturities of the Company's investments

	September 30, 2011				December 31, 2010
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Less than 1 year:
U.S. Treasuries	$	46,140	$	46,152	$	66,521	$	66,519
Certificates of deposit	33,847		33,847		7,004		7,004
Corporate bonds	2,021		2,021		-		-
Municipal securities	204,736		204,634		71,266		71,251
U.S. government agency securities	46,013		46,012		19,688		19,680
Due 1 - 10 years:
Variable rate demand notes	5,775		5,775		3,001		3,001
Due 11 - 20 years:
Variable rate demand notes	15,801		15,801		11,002		11,002
Auction rate securities	12,174		12,174		10,305		9,819
Due 21 - 30 years:
Variable rate demand notes	32,703		32,703		30,426		30,426
Auction rate securities	27,202		27,202		48,779		46,857
Due 31 - 40 years:
Variable rate demand notes	12,532		12,532		11,678		11,678
Auction rate securities	-		-		11,576		11,576
Total	$	438,944	$	438,853	$	291,246	$	288,813