Income Taxes Income Taxes - Effect of Income Taxes on Net Income and Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	8 Months Ended	12 Months Ended	4 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Apr. 30, 2013	Dec. 31, 2012
Successor [Member]
Income Tax Expense (Benefit) [Roll Forward]
Income tax expense (benefit)	$ 7,514	$ 9,557
Net Unrealized Losses On Securities Tax Effect	284	73,306
Valuation Allowances And Reserves Charged To Equity	(284)	(73,306)
Income Tax Effects Allocated Directly to Equity	0	0
Income tax expense (benefit)	7,514	9,557
Predecessor [Member]
Income Tax Expense (Benefit) [Roll Forward]
Income tax expense (benefit)			755	2,849
Net Unrealized Losses On Securities Tax Effect			(204,145)	18,448
Valuation Allowances And Reserves Charged To Equity			204,145	(18,448)
Income Tax Effects Allocated Directly to Equity			0	0
Income tax expense (benefit)			$ 755	$ 2,849