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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands | Oct. 09, 2018 | Dec. 31, 2018 | Dec. 31, 2017
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Subsequent Event [Line Items] |  |  |
Share price (in dollars per share) | $ 45.71 |  |
Assets |  | $ 9,884,716 | $ 9,367,478
MBT |  |  |
Subsequent Event [Line Items] |  |  |
Estimated transaction value | $ 290,900 |  |
Assets |  | $ 1,300,000 |

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