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INVESTMENTS (Tables)

6 Months Ended

Jun. 30, 2017

INVESTMENTS

Summary of investments in available-for-sale

June 30, 2017		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
Available-for-sale
Short-term:
Commercial paper		$	73,037		$	3		$	-		$	73,040		$	-		$	-
Certificates of deposit		37,210			-			-			37,210			-			-
Municipal securities		152,287			8			42			152,253			42			-
U.S. government agency securities		28,465			-			22			28,443			22			-
Variable rate demand notes		32,905			-			-			32,905			-			-
Long-term:
Municipal securities		32,704			-			17			32,687			17			-
U.S. government agency securities		15,974			-			22			15,952			22			-

Total		$	372,582		$	11		$	103		$	372,490		$	103		$	-


December 31, 2016		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

Available-for-sale
Short-term:
Commercial paper		$	40,382		$	-		$	-		$	40,382		$	-		$	-
Municipal securities		140,379			-			181			140,198			181			-
U.S. government agency securities		26,057			-			6			26,051			6			-
Variable rate demand notes		13,923			-			-			13,923			-			-
Long-term:
Municipal securities		2,403			-			9			2,394			9			-

Total		$	223,144		$	-		$	196		$	222,948		$	196		$	-

Summarizes the underlying contractual maturities of the Company's investments

		June 30, 2017						December 31, 2016

		Amortized Cost			Fair Value			Amortized Cost			Fair Value
Less than 1 year:
Commercial paper		$	73,037		$	73,040		$	40,382		$	40,382
Certificates of deposit		37,210			37,210			-			-
Municipal securities		152,287			152,253			140,379			140,198
U.S. government agency securities		28,465			28,443			26,057			26,051
Due 1 -10 years:
Municipal securities		32,704			32,687			2,403			2,394
U.S. government agency securities		15,974			15,952			-			-
Variable rate demand notes		3,918			3,918			3,917			3,917
Due 11 - 20 years:
Variable rate demand notes		10,006			10,006			6,003			6,003
Due 21 - 30 years:
Variable rate demand notes		14,979			14,979			4,003			4,003
Due 31 - 40 years:
Variable rate demand notes		4,002			4,002			-			-

Total		$	372,582		$	372,490		$	223,144		$	222,948