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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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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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