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Other comprehensive income (loss) and accumulated other comprehensive items (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ (1,485)
Other comprehensive (loss) income before reclassifications	609
Amounts reclassified from other comprehensive items	0
Other comprehensive (loss) income	609
Ending Balance	(876)
Unrealized Gains/(Losses) On Marketable Securities, net of tax
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(203)
Other comprehensive (loss) income before reclassifications	(22)
Amounts reclassified from other comprehensive items	0
Other comprehensive (loss) income	(22)
Ending Balance	(225)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(1,282)
Other comprehensive (loss) income before reclassifications	631
Amounts reclassified from other comprehensive items	0
Other comprehensive (loss) income	631
Ending Balance	$ (651)

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=66004921&loc=d3e1436-108581

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

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

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