Consolidated Statements of Cash Flows (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]
Cash flows from operating activities:
Net income (loss) attributable to common shareholders	$ 505,219	$ 484,071
Net (loss) gain	417	375
Net income (loss)	504,802	483,696
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	1,980	3,582
Amortization of bond premium and discount	(34,698)	(79,183)
Reorganization items	493	211
Share-based compensation	1,106	3,450
Deferred income taxes	619	(120)
Current income taxes	5,148	4,963
Deferred acquisition costs	0	0
Unearned premiums, net	(205,951)	(559,642)
Losses and loss expenses, net	(86,838)	(1,650,090)
Ceded premiums payable	(7,044)	(10,526)
Investment income due and accrued	298	12,648
Premium receivables	78,610	452,414
Accrued interest payable	58,046	9,322
Amortization of insurance intangible assets	99,658	151,830
Net mark-to-market (gains) losses	(183,091)	(20,863)
Net realized investment gains	(4,467)	(58,777)
Gains on extinguishment of debt	0	74,724
Other-than-temporary impairment charges	46,764	25,794
Variable interest entity activities	48,623	32,212
Other, net	(137,150)	152,846
Net cash (used in) provided by operating activities	186,908	(971,509)
Cash flows from investing activities:
Proceeds from sales of bonds	942,943	3,125,864
Proceeds from matured bonds	613,345	1,402,904
Purchases of bonds	(2,213,116)	(2,937,782)
Proceeds from sales of other invested assets	90,067	49,739
Purchases of other invested assets	(136,986)	(133,928)
Change in short-term investments	455,495	(88,946)
Loans, net	1,103	465
Change in swap collateral receivable	7,849	(153,853)
Other, net	(8,210)	10,690
Net cash provided by (used in) investing activities	(247,510)	1,275,153
Cash flows from financing activities:
Proceeds from the sale of Junior Surplus Notes of the Segregated Account	0	224,262
Paydowns of variable interest entity secured borrowing	(9,069)	0
Proceeds from warrant exercise	16	16
Payments for investment agreement draws	(5,926)	(199,970)
Payments for extinguishment of long-term debt	0	(331,419)
Net cash (used in) financing activities	(14,979)	(307,111)
Net cash flow	(75,581)	(3,467)
Cash and cash equivalents at beginning of period	77,370	73,903
Cash and cash equivalents end of period	152,951	77,370
Supplemental disclosure of cash flow information:
Income taxes	1,656	4,400
Interest on variable interest entity secured borrowing	170	0
Interest on investment agreements	832	518
Cash payments related to reorganization items:
Professional fees paid for services rendered in connection with the Chapter 11 proceeding	15,546	272
Successor [Member] | Surplus Notes [Member]
Supplemental disclosure of cash flow information:
Interest Expense	0	82,168
Predecessor [Member]
Cash flows from operating activities:
Net income (loss) attributable to common shareholders			3,349,049	(256,678)
Net (loss) gain			1,771	2,676
Net income (loss)			3,347,278	(259,354)
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization			974	3,066
Amortization of bond premium and discount			(60,146)	(189,402)
Reorganization items			(2,745,180)	7,215
Share-based compensation			0	0
Deferred income taxes			(6)	1,586
Current income taxes			(101,188)	1,069
Deferred acquisition costs			14,207	24,350
Unearned premiums, net			(172,549)	(635,346)
Losses and loss expenses, net			(43,284)	(261,304)
Ceded premiums payable			(2,059)	(21,028)
Investment income due and accrued			1,781	5,586
Premium receivables			88,990	407,858
Accrued interest payable			23,953	89,276
Amortization of insurance intangible assets			0	0
Net mark-to-market (gains) losses			63,828	22,932
Net realized investment gains			(53,305)	(72,101)
Gains on extinguishment of debt			0	177,580
Other-than-temporary impairment charges			467	5,990
Variable interest entity activities			(426,566)	(27,777)
Other, net			62,122	105,906
Net cash (used in) provided by operating activities			(683)	(613,898)
Cash flows from investing activities:
Proceeds from sales of bonds			310,916	592,672
Proceeds from matured bonds			307,472	1,109,468
Purchases of bonds			(286,633)	(798,740)
Proceeds from sales of other invested assets			0	0
Purchases of other invested assets			(164,368)	0
Change in short-term investments			(64,956)	121,413
Loans, net			1,920	9,793
Change in swap collateral receivable			(8,863)	43,635
Other, net			19,828	(40,261)
Net cash provided by (used in) investing activities			115,316	1,037,980
Cash flows from financing activities:
Proceeds from the sale of Junior Surplus Notes of the Segregated Account			0	0
Paydowns of variable interest entity secured borrowing			(5,519)	(21,012)
Proceeds from warrant exercise			0	0
Payments for investment agreement draws				(186,786)
Payments for extinguishment of long-term debt			0	(188,446)
Net cash (used in) financing activities			(5,519)	(396,244)
Net cash flow			109,114	27,838
Cash and cash equivalents at beginning of period			152,951	43,837
Cash and cash equivalents end of period			43,837	15,999
Supplemental disclosure of cash flow information:
Income taxes			102,129	1,493
Interest on variable interest entity secured borrowing			276	1,572
Interest on investment agreements			444	4,824
Cash payments related to reorganization items:
Professional fees paid for services rendered in connection with the Chapter 11 proceeding			3,860	9,141
Predecessor [Member] | Surplus Notes [Member]
Supplemental disclosure of cash flow information:
Interest Expense			$ 0	$ 0