Consolidated Statements of Cash Flows - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2013	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Successor [Member]
Cash flows from operating activities:
Net income attributable to common shareholders		$ 505,219	$ 493,403	$ 484,071
Net (loss) gain		417	709	375
Net income (loss)		504,802	492,694	483,696
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization		1,980	3,213	3,582
Goodwill, Impairment Loss			514,511	0
Amortization of bond premium and discount		(34,698)	(129,584)	(79,183)
Reorganization items		493	0	211
Share-based compensation		1,106	3,105	3,450
Deferred income taxes		619	126	(120)
Current income taxes		5,148	134	4,963
Deferred acquisition costs		0	0	0
Unearned premiums, net		(205,951)	(366,985)	(559,642)
Losses and loss expenses, net		(86,838)	(795,072)	(1,650,090)
Ceded premiums payable		(7,044)	(6,942)	(10,526)
Investment income due and accrued		298	(249)	12,648
Premium receivables		78,610	169,032	452,414
Accrued interest payable		58,046	51,397	9,322
Amortization of insurance intangible assets		99,658	169,557	151,830
Net mark-to-market (gains) losses		(183,091)	(38,916)	(20,863)
Net realized investment gains		(4,467)	(53,476)	(58,777)
(Gain) loss on extinguishment of debt		0	(81)	74,724
Other-than-temporary impairment charges		46,764	25,659	25,794
Variable interest entity activities		48,623	(31,569)	32,212
Other, net		(137,150)	80,988	152,846
Net cash provided by (used in) operating activities		186,908	87,542	(971,509)
Cash flows from investing activities:
Proceeds from sales of bonds		942,943	1,002,329	3,125,864
Proceeds from matured bonds		613,345	1,029,026	1,402,904
Purchases of bonds		(2,213,116)	(2,374,804)	(2,937,782)
Proceeds from sales of other invested assets		90,067	177,756	49,739
Purchases of other invested assets		(136,986)	(128,186)	(133,928)
Change in short-term investments		455,495	134,276	(88,946)
Loans, net		1,103	508	465
Change in cash collateral receivable		(3,040)	(6,833)	(158,240)
Other, net		2,679	(6,674)	15,077
Net cash provided by (used in) investing activities		(247,510)	(172,602)	1,275,153
Cash flows from financing activities:
Proceeds from the sale of Junior Surplus Notes of the Segregated Account		0	0	224,262
Proceeds Received from a Secured Borrowing		0	143,430	0
Net proceeds received from a secured borrowing		(9,069)	(13,533)	0
Paydowns of a secured borrowing		16	3	16
Payments for Repurchase of Warrants		0	(5,375)	0
Proceeds from warrant exercises		(5,926)	(63,872)	(199,970)
Cost of warrants acquired		0	(13,752)	(331,419)
Payments for investment agreement draws		(14,979)	46,901	(307,111)
Payments for extinguishment of long-term debt		(75,581)	(38,159)	(3,467)
Cash and cash equivalents at beginning of period		152,951	73,903	77,370
Cash and cash equivalents end of period	$ 152,951	77,370	35,744	73,903
Cash and cash equivalents end of period
Income taxes		1,656	16,969	4,400
Interest on investment agreements		832	341	518
Cash payments related to reorganization items:
Professional fees paid for services rendered in connection with the Chapter 11 proceeding		15,546	0	272
Successor [Member] | Surplus Notes [Member]
Cash and cash equivalents end of period
Interest Expense		0	0	82,168
Predecessor [Member]
Cash flows from operating activities:
Net income attributable to common shareholders	3,349,049
Net (loss) gain	1,771
Net income (loss)	3,347,278
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	974
Amortization of bond premium and discount	(60,146)
Reorganization items	(2,745,180)
Share-based compensation	0
Deferred income taxes	(6)
Current income taxes	(101,188)
Deferred acquisition costs	14,207
Unearned premiums, net	(172,549)
Losses and loss expenses, net	(43,284)
Ceded premiums payable	(2,059)
Investment income due and accrued	1,781
Premium receivables	88,990
Accrued interest payable	23,953
Amortization of insurance intangible assets	0
Net mark-to-market (gains) losses	63,828
Net realized investment gains	(53,305)
(Gain) loss on extinguishment of debt	0
Other-than-temporary impairment charges	467
Variable interest entity activities	(426,566)
Other, net	62,122
Net cash provided by (used in) operating activities	(683)
Cash flows from investing activities:
Proceeds from sales of bonds	310,916
Proceeds from matured bonds	307,472
Purchases of bonds	(286,633)
Proceeds from sales of other invested assets	0
Purchases of other invested assets	(164,368)
Change in short-term investments	(64,956)
Loans, net	1,920
Change in cash collateral receivable	(19,405)
Other, net	30,370
Net cash provided by (used in) investing activities	115,316
Cash flows from financing activities:
Proceeds from the sale of Junior Surplus Notes of the Segregated Account	0
Proceeds Received from a Secured Borrowing	0
Net proceeds received from a secured borrowing	(5,519)
Paydowns of a secured borrowing	0
Payments for Repurchase of Warrants	0
Proceeds from warrant exercises	0
Cost of warrants acquired	0
Payments for investment agreement draws	(5,519)
Payments for extinguishment of long-term debt	109,114
Cash and cash equivalents at beginning of period	43,837	152,951
Cash and cash equivalents end of period	152,951
Cash and cash equivalents end of period
Income taxes	102,129
Interest on investment agreements	444
Cash payments related to reorganization items:
Professional fees paid for services rendered in connection with the Chapter 11 proceeding	3,860
Predecessor [Member] | Surplus Notes [Member]
Cash and cash equivalents end of period
Interest Expense	0
Variable Interest Entity [Member] | Successor [Member] | Secured Borrowing [Member]
Cash and cash equivalents end of period
Interest Paid		$ 170	$ 1,506	$ 0
Variable Interest Entity [Member] | Predecessor [Member] | Secured Borrowing [Member]
Cash and cash equivalents end of period
Interest Paid	$ 276