Consolidated Statements of Cash Flows - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income attributable to common shareholders	$ (125,441)	$ 9,415
Net (loss) gain	0	0
Net income (loss)	(125,441)	9,415
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	270	303
Amortization of bond premium and discount	(36,178)	(26,336)
Share-based compensation	1,521	1,082
Deferred income taxes	26	(446)
Current income taxes	11,550	(2,479)
Unearned premiums, net	(36,272)	(77,229)
Losses and loss expenses, net	131,188	800,823
Ceded premiums payable	(2,328)	(6,156)
Investment income due and accrued	(1,250)	(124)
Premium receivables	8,630	49,507
Accrued interest payable	4,866	16,152
Amortization of insurance intangible assets	37,525	50,890
Net mark-to-market (gains) losses	(853)	(12,614)
Net realized investment gains	4,896	(1,102)
Other-than-temporary impairment charges	3,942	9,334
(Gain) loss on extinguishment of debt	(2,741)	(1,235)
Variable interest entity activities	(3,701)	27,163
Other, net	1,704	(8,872)
Net cash provided by (used in) operating activities	(2,646)	828,076
Cash flows from investing activities:
Proceeds from sales of bonds	305,541	136,175
Proceeds from matured bonds	227,741	297,619
Purchases of bonds	(439,473)	(1,002,314)
Proceeds from sales of other invested assets	121,353	3,061
Purchases of other invested assets	(139,561)	(15,690)
Change in short-term investments	83,550	(211,036)
Loans, net	(77)	97
Change in cash collateral receivable	9,615	(29,788)
Other, net	(1,112)	8,001
Net cash provided by (used in) investing activities	167,577	(813,875)
Cash flows from financing activities:
Paydowns of a secured borrowing	(10,355)	(8,871)
Warrants Purchased During Period Dollars	0
Payments for investment agreement draws	(82,358)	0
Payments for extinguishment of long-term debt	(43,666)	(11,453)
Payments Related to Tax Withholding for Share-based Compensation	(1,268)	(10)
Net cash used in financing activities	(137,647)	(20,334)
Effect of Exchange Rate on Cash and Cash Equivalents	463	(469)
Net cash flow	27,747	(6,602)
Cash and cash equivalents at beginning of period	91,025	35,744
Cash and cash equivalents end of period	118,772	29,142
Supplemental disclosure of cash flow information:
Income taxes	8,295	6,477
Decrease in long-term debt as a result of an exchange for investment securities	55,426	0
Long-term Debt [Member]
Supplemental disclosure of cash flow information:
Interest Paid	$ 28,791	$ 7,995