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Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Cumulative effect adjustment for adoption of new accounting standards | $ 0 |  | $ 0 |  |  | $ 0
Net unrealized gain on equity investments | 2,920 | $ 0 | 2,626 | $ 0 |  |
Future minimum lease payments |  |  |  |  |  | 3,600
Retained Earnings |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Cumulative effect adjustment for adoption of new accounting standards | $ 0 |  | $ 0 |  |  | $ 13,627
Retained Earnings | Accounting Standards Update 2018-02 |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Cumulative effect adjustment for adoption of new accounting standards |  |  |  |  | $ 3,100 |
Retained Earnings | Accounting Standards Update 2016-01 |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Cumulative effect adjustment for adoption of new accounting standards |  |  |  |  | $ 16,800 |

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