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Summary of Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Accounting Policies [Abstract] |  |  |
Impairments to investments | $ 0 | $ 0 | $ 0
Property, Plant and Equipment [Line Items] |  |  |
Fully depreciated assets taken out of service | 3,500,000 | 4,800,000 |
Property and equipment asset impairments | 0 | 0 | 0
Goodwill impairments | 0 | 0 | 0
Indefinite-lived intangible asset impairments | 0 | 0 | 0
Finite-lived intangible asset impairments | $ 0 | 0 | 0
Deferred sales commission asset estimated period of benefit | 6 years |  |
Deferred sales commission amortization expense | $ 2,967,000 | 8,025,000 | 11,980,000
Deferred sales commission asset impairments | 0 | 0 | 0
Deferred sales commissions expensed as incurred | $ 4,700,000 | 1,400,000 | 3,100,000
Termination period | 60 days |  |
Expensed advertising costs | $ 5,200,000 | $ 1,500,000 | $ 2,700,000
Number of operating segments | segment | 1 |  |
Number of reporting units | segment | 1 |  |
Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 1 year |  |
Termination period | 3 months |  |
Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 15 years |  |
Termination period | 12 months |  |
Software and Software Development Costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 4 years |  |

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- Definition The maximum estimated period of benefit for commissions paid upon the sale of certain shares classes of mutual funds without an upfront sales charge. + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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