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Investments (Investments Held to Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Gain (Loss) on Investments [Line Items] |  |
Amortized Cost | $ 20,518 | $ 17,483
Gross Unrealized Gain | 0 | 0
Gross Unrealized (Loss) | (16) | (33)
Fair Value | 20,502 | 17,450
Current Assets [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Amortized Cost | 20,518 | 12,444
Gross Unrealized Gain | 0 | 0
Gross Unrealized (Loss) | (16) | (16)
Fair Value | 20,502 | 12,428
Non Current Assets [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Amortized Cost | 0 | 5,039
Gross Unrealized Gain | 0 | 0
Gross Unrealized (Loss) | 0 | (17)
Fair Value | $ 0 | $ 5,022

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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