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Investments in Marketable Securities Available-for-Sale (Tables)

12 Months Ended

Dec. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities [Table Text Block]

Following is a summary of marketable securities as of December 31, 2015 and 2016:

		December 31, 2015
					Gross			Gross			Aggregate
		Aggregate			Unrealized			Unrealized			Market
		Cost			Gains			Losses			Value
		(in thousands)
Time deposit with original maturities more than three months		$	5,546			2			(120)			5,428
Money market fund			13,244			18			(179)			13,083
Total		$	18,790			20			(299)			18,511

		December 31, 2016
					Gross			Gross			Aggregate
		Aggregate			Unrealized			Unrealized			Market
		Cost			Gains			Losses			Value
		(in thousands)
Time deposit with original maturities more than three months		$	5,539			-			(399)			5,140
Money market fund			4,968			49			-			5,017
Total		$	10,507			49			(399)			10,157

Schedule Of Information On Sales Of Available For Sale Marketable Securities [Table Text Block]

Information on sales of available for sale marketable securities for the years ended December 31, 2014, 2015 and 2016 is summarized below.

		Proceeds			Gross			Gross
Period		from sales			realized gains			realized losses
					(in thousands)
Year 2014		$	22,021			15			(46)
Year 2015		$	46,720			261			(38)
Year 2016		$	38,532			137			(127)

X

- 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=6957658&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=73527792&loc=d3e27337-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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- Definition

Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.

+ References

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