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Acquisitions - Changes in the Group's Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Changes in the Group's goodwill by segment
Balance at the beginning of the year	$ 11,117	$ 11,652
Currency translation adjustment	(851)	(535)
Balance at the end of the year	10,266	11,117
Impairment of goodwill	0
Advertising & Marketing
Changes in the Group's goodwill by segment
Balance at the beginning of the year	0	0
Currency translation adjustment	0	0
Balance at the end of the year	0	0
Other
Changes in the Group's goodwill by segment
Balance at the beginning of the year	11,117	11,652
Currency translation adjustment	(851)	(535)
Balance at the end of the year	$ 10,266	$ 11,117

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
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-Topic 230
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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