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Other comprehensive income (loss) and accumulated other comprehensive items (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 885	$ (1,200)
Other comprehensive (loss) income before reclassifications	(129)	1,956
Amounts reclassified from other comprehensive items	0	0
Other comprehensive (loss) income	(129)	1,956
Ending Balance	756	756
Unrealized Gains/(Losses) On Marketable Securities, net of tax
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	29	(589)
Other comprehensive (loss) income before reclassifications	(189)	429
Amounts reclassified from other comprehensive items	0	0
Other comprehensive (loss) income	(189)	429
Ending Balance	(160)	(160)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	856	(611)
Other comprehensive (loss) income before reclassifications	60	1,527
Amounts reclassified from other comprehensive items	0	0
Other comprehensive (loss) income	60	1,527
Ending Balance	$ 916	$ 916

X

- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=51821188&loc=d3e1436-108581

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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