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Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Summary of Investments

Investments consist of the following as of December 31, 2017 and 2016 (dollars in thousands):

		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 investments (available for sale)		$	161,596			$	7			$	(355	)		$	161,248

		December 31, 2016
						Gross Unrealized
		Cost				Gain				(Loss)				Fair Value
Short-term investments (available for sale):
Municipal bonds		$	4,050			$	-			$	-			$	4,050
Non-governmental debt securities			107,305				22				(113	)			107,214
Treasury and federal agencies			36,480				10				(73	)			36,417
Total short-term investments			147,835				32				(186	)			147,681
Restricted short-term investments (available for sale):
Non-governmental debt securities			8,597				-				-				8,597
Total investments (available for sale)		$	156,432			$	32			$	(186	)		$	156,278

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, 2017 and 2016 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, 2017		$	113,634			$	46,586			$	-			$	1,028			$	161,248
Original stated term to maturity of available-for-sale-    investments as of December 31, 2016		$	113,040			$	39,459			$	800			$	2,979			$	156,278

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, 2017 and 2016 were as follows (dollars in thousands):

		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

		As of December 31, 2016
		Level 1				Level 2				Level 3				Total
Municipal bonds		$	-			$	4,050			$	-			$	4,050
Non-governmental debt securities			33,597				82,214				-				115,811
Treasury and federal agencies			-				36,417				-				36,417
Totals		$	33,597			$	122,681			$	-			$	156,278

Schedule of Maintenance Fee Payment to CCKF

We make periodic operating maintenance payments related to proprietary rights that we use in our intellipath^TM personalized learning technology. The total fees paid to CCKF for the years ended December 31, 2017, 2016 and 2015 were as follows (dollars in thousands):

		Maintenance Fee Payments
For the year ended December 31, 2017		$	1,371
For the year ended December 31, 2016		$	1,375
For the year ended December 31, 2015		$	1,390

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- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803

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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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-Section 50
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