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Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Summary of Investments

Investments consist of the following as of December 31, 2018 and 2017 (dollars in thousands):

		December 31, 2018
						Gross Unrealized
		Cost				Gain				(Loss)				Fair Value
Short-term investments (available for sale):
Non-governmental debt securities		$	179,393			$	35			$	(337	)		$	179,091
Treasury and federal agencies			17,417				5				(85	)			17,337
Total short-term investments (available for sale)		$	196,810			$	40			$	(422	)		$	196,428

		December 31, 2017
						Gross Unrealized
		Cost				Gain				(Loss)				Fair Value
Short-term investments (available for sale):
Municipal bonds		$	830			$	-			$	-			$	830
Non-governmental debt securities			125,485				7				(222	)			125,270
Treasury and federal agencies			30,211				-				(133	)			30,078
Total short-term investments			156,526				7				(355	)			156,178
Restricted short-term investments (available for sale):
Non-governmental debt securities			5,070				-				-				5,070
Total short-term investments (available for sale)		$	161,596			$	7			$	(355	)		$	161,248

Schedule of Available-for-Sale Investments

A schedule of available-for-sale investments segregated by their original stated terms to maturity as of December 31, 2018 and 2017 are as follows (dollars in thousands): 

		Less than one year				One to five years				Six to ten years				Greater than ten years				Total
Original stated term to maturity of available-for-sale-    investments as of December 31, 2018		$	156,657			$	38,845			$	-			$	926			$	196,428
Original stated term to maturity of available-for-sale-    investments as of December 31, 2017		$	113,634			$	46,586			$	-			$	1,028			$	161,248

Investments Measured at Fair Value on Recurring Basis

Investments measured at fair value on a recurring basis subject to the disclosure requirements of FASB ASC Topic 820 – Fair Value Measurements at December 31, 2018 and 2017 were as follows (dollars in thousands):

		As of December 31, 2018
		Level 1				Level 2				Level 3				Total
Non-governmental debt securities		$	20,000			$	159,091			$	-			$	179,091
Treasury and federal agencies			-				17,337				-				17,337
Totals		$	20,000			$	176,428			$	-			$	196,428

		As of December 31, 2017
		Level 1				Level 2				Level 3				Total
Municipal bonds		$	-			$	830			$	-			$	830
Non-governmental debt securities			31,500				98,840				-				130,340
Treasury and federal agencies			-				30,078				-				30,078
Totals		$	31,500			$	129,748			$	-			$	161,248

Schedule of Maintenance Fee Payment to CCKF

We make periodic operating maintenance payments related to proprietary rights that we use in our intellipath^® personalized learning technology. The total fees paid to CCKF for the years ended December 31, 2018, 2017 and 2016 were as follows (dollars in thousands):

		Maintenance Fee Payments
For the year ended December 31, 2018		$	1,462
For the year ended December 31, 2017		$	1,371
For the year ended December 31, 2016		$	1,375

X

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-URI http://asc.fasb.org/topic&trid=2196928

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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