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Other comprehensive income (loss) and accumulated other comprehensive items (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ (876)	$ (1,485)
Other comprehensive (loss) income before reclassifications	2,875	3,484
Amounts reclassified from other comprehensive items	0	0
Other comprehensive (loss) income	2,875	3,484
Ending Balance	1,999	1,999
Unrealized Gains/(Losses) On Marketable Securities, net of tax
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(225)	(203)
Other comprehensive (loss) income before reclassifications	(9)	(31)
Amounts reclassified from other comprehensive items	0	0
Other comprehensive (loss) income	(9)	(31)
Ending Balance	(234)	(234)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(651)	(1,282)
Other comprehensive (loss) income before reclassifications	2,884	3,515
Amounts reclassified from other comprehensive items	0	0
Other comprehensive (loss) income	2,884	3,515
Ending Balance	$ 2,233	$ 2,233

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=84158357&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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