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Investments - Derivative - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Embedded Derivative, Fair Value of Embedded Derivative, Net [Abstract] |  |
Aggregate fair value of embedded conversion options | $ 1.3 | $ 0.9

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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration