INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2012

INVESTMENTS

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

December 31, 2012	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	$	16,040	$	-	$	-	$	16,040	$	-	$	-
Certificates of deposit	2,201		-		-		2,201		-		-
Municipal securities	77,038		-		11		77,027		11		-
Available-for-sale
Long-term:
Auction rate securities	3,310		2,483		-		5,793		-		-
Total	$	98,589	$	2,483	$	11	101,061		$	11	$	-
Trading
Short-term:
Auction rate securities							1,763
Long-term:
Auction rate securities							15,600
Total							$	118,424

December 31, 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	$	8,034	$	5	$	-	$	8,039	$	-	$	-
Certificates of deposit	29,034		1		-		29,035		-		-
Corporate bonds	2,022		-		-		2,022		-		-
Municipal securities	284,605		-		64		284,541		64		-
U.S. government agency securities	16,005		2		-		16,007		-		-
Available-for-sale
Short-term:
Variable rate demand notes	58,924		-		-		58,924		-		-
Long-term:
Auction rate securities	3,320		-		-		3,320		-		-
Total	$	401,944	$	8	$	64	401,888		$	64	$	-
Trading
Short-term:
Auction rate securities							12,658
Long-term:
Auction rate securities							19,874
Total							$	434,420

Schedule of net gain (loss) recognized through earnings on trading securities

	2012		2011			2010
(Loss) on transfer from available-for-sale to trading	$	-	$	(2,438	)	$	(4,876	)
Gain on trading securities sold	1,130		2,604			375
Gain (loss) on trading securities held	753		(210		)	572
Gain (loss) on trading securites	$	1,883	$	(44	)	$	(3,929	)

Summarizes the underlying contractual maturities of the Company's investments

	December 31, 2012				December 31, 2011
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Less than 1 year:
U.S. Treasuries	$	16,040	$	16,040	$	8,034	$	8,039
Certificates of deposit	2,201		2,201		29,034		29,035
Corporate bonds	-		-		2,022		2,022
Municipal securities	77,038		77,027		284,605		284,541
U.S. government agency securities	-		-		16,005		16,007
Due 1 - 10 years:
Variable rate demand notes	-		-		5,775		5,775
Due 11 - 20 years:
Variable rate demand notes	-		-		12,716		12,716
Auction rate securities	10,748		10,748		5,158		5,158
Due 21 - 30 years:
Variable rate demand notes	-		-		27,902		27,902
Auction rate securities	9,925		12,408		25,134		25,134
Due 31 - 40 years:
Variable rate demand notes	-		-		12,532		12,532
Auction rate securities	-		-		5,559		5,559
Total	$	115,952	$	118,424	$	434,476	$	434,420