v3.10.0.1

Basis and Summary of Significant Accounting Policies - Investments (Details) $ in Thousands, £ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Impairment of Investment | $ 0 |  | $ 0 | $ (20,098) | $ 0 |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Held-to-maturity securities |  |  |  |  |  | £ 15.1 | $ 20,400
Impairment of Investment |  | $ (20,100) |  |  |  |  |

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