INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2015

INVESTMENTS

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

March 31, 2015	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:
Commercial paper	$	15,991	$	-	$	1	$	15,990	$	-	$	-
Municipal securities	622,082		48		-		622,130		-		-
U.S. Government Agencies	1,401		-		-		1,401		-		-
Long-term:
Municipal securities	33,662		8		-		33,670		-		-
U.S. Government Agencies	7,578		-		7		7,571		-		-
Available-for-sale
Variable rate demand notes	3,900		-		-		3,900		-		-
Total	$	684,614	$	56	$	8	684,662		$	-	$	-
Trading
Short-term:
Auction rate securities							3,910
Long-term:
Auction rate securities							-
Total							$	688,572
December 31, 2014	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:
Commercial paper	$	19,482	$	-	$	2	$	19,480	$	-	$	-
Municipal securities	744,542		105		-		744,647		-		-
U.S. Government Agencies	9,199		-		1		9,198		-		-
Long-term:
Municipal securities	42,940		10		-		42,950		-		-
Available-for-sale
Variable rate demand notes	4,001		-		-		4,001		-		-
Total	$	820,164	$	115	$	3	820,276		$	-	$	-
Trading
Short-term:
Auction rate securities							3,910
Long-term:
Auction rate securities							-
Total							$	824,186

Summarizes the underlying contractual maturities of the Company's investments

	March 31, 2015				December 31, 2014
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Less than 1 year:
Commercial paper	$	15,991	$	15,990	$	19,482	$	19,480
Municipal securities	622,082		622,130		744,542		744,647
U.S. government agency securities	1,401		1,401		9,199		9,198
Due 1 - 10 years:
Municipal securities	33,662		33,670		42,940		42,950
U.S. government agency securities	7,578		7,571
Due 11 - 20 years:
Auction rate securities	3,910		3,910		3,910		3,910
Due 21 - 30 years:
Variable rate demand notes	3,900		3,900		4,001		4,001
Total	$	688,524	$	688,572	$	824,074	$	824,186