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Pending Merger (Details) - USD ($) $ / shares in Units, $ in Thousands | Oct. 09, 2018 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Share price (in dollars per share) | $ 45.71 |  |
Assets |  | $ 10,737,857 | $ 9,884,716
MBT |  |  |
Business Acquisition [Line Items] |  |  |
Total purchase price | $ 290,900 |  |
Assets |  | $ 1,300,000 |

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