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INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2017

INVESTMENTS

Summary of investments in available-for-sale

March 31, 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		$	50,623		$	-		$	-		$	50,623		$	-		$	-
Certificates of deposit		3,164			-			-			3,164			-			-
Municipal securities		119,833			2			56			119,779			54			-
U.S. government agency securities		10,076			-			6			10,070			6			-
Variable rate demand notes		25,730			-			-			25,730			-			-
Long-term:
Municipal securities		478			-			1			477			1			-

Total		$	209,904		$	2		$	63		$	209,843		$	61		$	-


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

		March 31, 2017						December 31, 2016

		Amortized Cost			Fair Value			Amortized Cost			Fair Value
Less than 1 year:
Commercial paper		$	50,623		$	50,623		$	40,382		$	40,382
Certificates of deposit		3,164			3,164			-			-
Municipal securities		119,833			119,779			140,379			140,198
U.S. government agency securities		10,076			10,070			26,057			26,051
Due 1 -10 years:
Municipal securities		478			477			2,403			2,394
Variable rate demand notes		3,917			3,917			3,917			3,917
Due 11 - 20 years:
Variable rate demand notes		13,808			13,808			6,003			6,003
Due 21 - 30 years:
Variable rate demand notes		4,002			4,002			4,003			4,003
Due 31 - 40 years:
Variable rate demand notes		4,003			4,003			-			-

Total		$	209,904		$	209,843		$	223,144		$	222,948