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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