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Mandatorily Redeemable Preferred Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Related Party Transaction [Line Items] |  |  |  |
Loss on extinguishment of debt | $ 66,911 | $ 0 | $ 88,472 | $ 61,597
Mandatorily Redeemable Preferred Stock | Koch |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Loss on extinguishment of debt |  |  | $ 213,000 |

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