Investments Investments (Available for Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 465,744	$ 468,171
Gross Unrealized Holding Gains	2,912	13,627
Gross Unrealized Holding Losses	(6,122)	(2,475)
Estimated Fair Value	462,534	479,323
Total fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		422,255
Gross Unrealized Holding Gains		5,180
Gross Unrealized Holding Losses		(2,244)
Estimated Fair Value		425,191
U.S. Treasury securities and obligations of U.S. government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	608	9,108
Gross Unrealized Holding Gains	2	4
Gross Unrealized Holding Losses	(4)	(14)
Estimated Fair Value	606	9,098
Obligations of states, municipalities and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	158,889	161,012
Gross Unrealized Holding Gains	1,858	3,726
Gross Unrealized Holding Losses	(2,032)	(412)
Estimated Fair Value	158,715	164,326
Corporate and other securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	93,807	71,224
Gross Unrealized Holding Gains	435	579
Gross Unrealized Holding Losses	(578)	(172)
Estimated Fair Value	93,664	71,631
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	123,397	95,223
Gross Unrealized Holding Gains	221	405
Gross Unrealized Holding Losses	(681)	(268)
Estimated Fair Value	122,937	95,360
Residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	89,043	85,688
Gross Unrealized Holding Gains	396	466
Gross Unrealized Holding Losses	(2,827)	(1,378)
Estimated Fair Value	$ 86,612	84,776
Total equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		45,916
Gross Unrealized Holding Gains		8,447
Gross Unrealized Holding Losses		(231)
Estimated Fair Value		54,132
Exchange traded funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		26,041
Gross Unrealized Holding Gains		8,339
Gross Unrealized Holding Losses		0
Estimated Fair Value		34,380
Nonredeemable preferred stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		19,875
Gross Unrealized Holding Gains		108
Gross Unrealized Holding Losses		(231)
Estimated Fair Value		$ 19,752