Schedule II Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 276,275	$ 150,688	$ 84,786	$ 61,391
Accrued investment income	5,577	3,735
Goodwill	73,045	14,254	3,413
Property, Plant and Equipment, Net	17,291	17,860
Other Assets	11,096	11,183
Total Assets	2,059,921	999,686
Accounts Payable	46,594	26,124
Other Liabilities	85,830	43,158
Notes payable	161,364	54,175
Total Liabilities	1,522,796	758,359
Common Stock, Value, Issued	4	2
Additional Paid in Capital	387,145	99,353
Treasury Stock, Value	(431)	(431)
Accumulated other comprehensive income	9,221	822	1,620	4,011
Retained Earnings (Accumulated Deficit)	141,186	141,581
Total Stockholders' Equity	537,125	241,327
Liabilities and Equity	2,059,921	999,686
Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Fixed maturities (amortized cost of $763,434 and $497,616, respectively)	26,583	0
Cash and cash equivalents	79,331	7,399	$ 11,555	$ 4,097
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	579,313	263,712
Goodwill	10,157	10,841
Property, Plant and Equipment, Net	7,761	7,993
Other Assets	12,439	11,337
Total Assets	715,584	301,282
Due to Related Parties	26,128	14,531
Accounts Payable	967	520
Other Liabilities	0	1,906
Notes payable	151,364	42,998
Total Liabilities	178,459	59,955
Common Stock, Value, Issued	4	2
Additional Paid in Capital	387,145	99,353
Treasury Stock, Value	(431)	(431)
Accumulated other comprehensive income	9,221	822
Retained Earnings (Accumulated Deficit)	141,186	141,581
Total Stockholders' Equity	537,125	241,327
Liabilities and Equity	$ 715,584	$ 301,282