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Financial Instruments - Fair Value Hierarchy (Details) - Financial instruments measured on a recurring basis - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value of Financial Instruments
Bank time deposits	$ 31,188	$ 149,532
Available-for-sale securities	5,274	12,831
Total	36,462	162,363
Quoted Prices in Active Market for Identical Assets (Level 1)
Fair Value of Financial Instruments
Available-for-sale securities	5,274	12,831
Total	5,274	12,831
Significant Other Observable Inputs (Level 2)
Fair Value of Financial Instruments
Bank time deposits	31,188	149,532
Total	$ 31,188	$ 149,532

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

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-Name Accounting Standards Codification
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- Definition

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