INVESTMENTS (Tables)

6 Months Ended

Jun. 30, 2015

INVESTMENTS

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

June 30, 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	$	182,130	$	-	$	-	$	182,130	$	-	$	-
U.S. Treasuries	74,981		6		-		74,987		-		-
Certificates of deposit	32,001		-		-		32,001		-		-
Municipal securities	587,740		82		42		587,780		42		-
U.S. government agency securities	350,859		27		10		350,876		10		-
Long-term:
Municipal securities	52,364		33		5		52,392		5		-
U.S. government agency securities	-		-		-		-		-		-
Available-for-sale
Variable rate demand notes	3,901		-		-		3,901		-		-
Total	$	1,283,976	$	148	$	57	1,284,067		$	57	$	-
Trading
Short-term:
Auction rate securities							3,246
Long-term:
Auction rate securities							-
Total							$	1,287,313
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 agency securities	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

	June 30, 2015				December 31, 2014
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Less than 1 year:
Commercial paper	$	182,130	$	182,130	$	19,482	$	19,480
U.S. Treasuries	74,981		74,987		-		-
Certificates of deposit	32,001		32,001		-		-
Municipal securities	587,740		587,780		744,542		744,647
U.S. government agency securities	350,859		350,876		9,199		9,198
Due 1 - 10 years:
Municipal securities	52,364		52,392		42,940		42,950
Due 11 - 20 years:
Auction rate securities	3,246		3,246		3,910		3,910
Due 21 - 30 years:
Variable rate demand notes	3,901		3,901		4,001		4,001
Total	$	1,287,222	$	1,287,313	$	824,074	$	824,186