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Summary of Significant Accounting Policies Types of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Accounting Policies [Abstract] |  |
Revenues - Paid up | $ 60,063 | $ 7,196
Revenues - Sales-based | 2,030 | 1,658
Revenues | $ 62,093 | $ 8,854

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- Definition Revenues - Paid up + References No definition available. + Details
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- Definition Revenues - Sales-based + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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