Schedule II Statement of Cash Flows (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Mar. 05, 2014	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Cash Flow Statements, Captions [Line Items]
Net income		$ (10,517)	$ 3,423	$ 9,841	$ 2,951	$ 13,802	$ 8,083	$ 5,275	$ 198	$ 5,698	$ 27,358	$ 41,013
Depreciation and amortization										11,713	3,328	801
Gain (Loss) on Sale of Securities, Net										(547)	(827)	20
Increase (Decrease) in Deferred Income Taxes										2,210	2,305	(1,181)
Share-based Compensation										1,947	1,974	649
Increase (Decrease) in Accrued Investment Income Receivable										(172)	(676)	(487)
Increase (Decrease) in Other Operating Assets										(11,006)	(3,897)	(1,493)
Increase (Decrease) in Other Operating Liabilities										20,305	2,557	(507)
Net Cash Provided by (Used in) Operating Activities										65,747	98,319	68,918
Proceeds from sales and maturities of investments available for sale										187,522	199,575	219,893
Payments to Acquire Property, Plant, and Equipment										(3,149)	(10,916)	(6,346)
Net Cash Provided by (Used in) Investing Activities										(49,757)	(67,015)	(91,466)
Payments Related to Tax Withholding for Share-based Compensation										(270)	(185)	(110)
Payments of Dividends										4,974	4,302	3,336
Proceeds from Issuance of Common Stock	$ 54,041									0	0	54,041
Net Cash Provided by (Used in) Financing Activities										49,912	(7,909)	49,051
Cash and Cash Equivalents, Period Increase (Decrease)										65,902	23,395	26,503
Cash and Cash Equivalents, at Carrying Value		150,688				84,786				150,688	84,786	61,391	$ 34,888
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net income										5,698	27,358	41,013
Depreciation and amortization										682	74	0
Gain (Loss) on Sale of Securities, Net										14	(951)	0
Increase (Decrease) in Deferred Income Taxes										382	126	(44)
Share-based Compensation										1,947	1,974	649
Increase (Decrease) in Accrued Investment Income Receivable										3	(3)	0
Increase (Decrease) in Other Operating Assets										(22,553)	450	(548)
Increase (Decrease) in Notes Payable, Related Parties										5,874	2,557	(47,033)
Increase (Decrease) in Other Operating Liabilities										1,969	918	(352)
Net Cash Provided by (Used in) Operating Activities										(5,984)	32,503	(6,315)
Proceeds from sales and maturities of investments available for sale										34,551	19,633	0
Payments to Acquire Investments										(70)	(53,212)	0
Payments to Acquire Interest in Subsidiaries and Affiliates										(68,563)	16,276	(36,608)
Payments to Acquire Property, Plant, and Equipment										(1,797)	(3,255)	(3,583)
Net Cash Provided by (Used in) Investing Activities										(35,879)	(20,558)	(40,191)
Payments Related to Tax Withholding for Share-based Compensation										(270)	(185)	(110)
Proceeds from Issuance of Debt										42,951	0	0
Payments of Dividends										4,974	4,302	3,336
Proceeds from Issuance of Common Stock										0	0	54,041
Net Cash Provided by (Used in) Financing Activities										37,707	(4,487)	50,595
Cash and Cash Equivalents, Period Increase (Decrease)										(4,156)	7,458	4,089
Cash and Cash Equivalents, at Carrying Value		$ 7,399				$ 11,555				$ 7,399	$ 11,555	$ 4,097	$ 8