Goodwill and Intangible Assets, net Table of Intangible Assets, Net Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 1,768		$ 1,317
Finite-lived Intangible Assets [Roll Forward]
Balance, Beginning of Period	$ 64,017		73,658		84,031
Intangible assets divested	(2,167)
Less: amortization expense	(9,729)		(11,409)		(11,690)
Balance, End of Period	52,121		64,017		73,658
Impairment of Intangible Assets (Excluding Goodwill) [Abstract]
Impairment of Intangible Assets (Excluding Goodwill)	0		0		0
Specialty Insurance
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			1,768		1,317
Finite-lived Intangible Assets [Roll Forward]
Balance, Beginning of Period	63,005		72,475		82,677
Intangible assets divested	(2,167)
Less: amortization expense	9,557		(11,238)		(11,519)
Balance, End of Period	51,281		63,005		72,475
Other Segments
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			0		0
Finite-lived Intangible Assets [Roll Forward]
Balance, Beginning of Period	1,012	[1]	1,183		1,354
Intangible assets divested	0
Less: amortization expense	172		(171)		(171)
Balance, End of Period	$ 840	[1]	$ 1,012	[1]	$ 1,183

[1] Other is primarily comprised of mortgage operations.