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Short-term Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, amortized cost |  | $ 58,819 |
Available-for-sale securities, gross unrealized gains |  | 2 |
Available-for-sale securities, gross unrealized losses |  | (263) |
Available-for-sale securities, fair value |  | 58,558 |
Available-for-sale Securities, Gross Realized Gains |  |  | $ 1,174
Available-for-sale Securities, Gross Realized Losses | $ 617 | 2,188 | 981
Proceeds from Sale and Maturity of Marketable Securities | $ 82,115 | $ 182,115 | $ 239,370
Maximum [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investment Maturity Date | Dec. 31, 2015 |  |

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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=28360136&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=27724398&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=6871852&loc=d3e26610-111562 + Details
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