Basis of Presentation and Significant Accounting Policies FX gain (loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Foreign Currency Transaction Gain (Loss), before Tax	$ (39,128)	$ (17,010)	$ (25,483)
Successor [Member]
Foreign Currency Transaction Gain (Loss), before Tax	30,179	5,816	5,235
Lossandlossreserves [Member]
Foreign Currency Transaction Gain (Loss), before Tax	(77,578)	(24,838)	(30,079)
Gain (Loss) on Investments [Member]
Foreign Currency Transaction Gain (Loss), before Tax	30,179	5,816	5,235
Premiums Receivable [Member]
Foreign Currency Transaction Gain (Loss), before Tax	8,003	(2,555)	(4,470)
Unrealized Gains Or Losses On Credit Derivative Contracts [Member]
Foreign Currency Transaction Gain (Loss), before Tax	$ 32	$ 3,981	$ 3,234