Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	$ (56,035)	$ (42,115)
Finite-Lived Intangible Assets, Net	27,795	41,715
Intangible Assets, Gross (Excluding Goodwill)	83,830	83,830
Indefinite-lived Intangible Assets (Excluding Goodwill)	3,556	3,556
Intangible Assets Arising from Insurance Contracts Acquired in Business Combination [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	42,788	42,788
Finite-Lived Intangible Assets, Accumulated Amortization	(42,788)	(34,335)
Finite-Lived Intangible Assets, Net	0	8,453
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	34,661	34,661
Finite-Lived Intangible Assets, Accumulated Amortization	(11,164)	(6,669)
Finite-Lived Intangible Assets, Net	$ 23,497	$ 27,992
Finite-Lived Intangible Assets, Remaining Amortization Period	7 years 4 months	8 years
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 6,381	$ 6,381
Finite-Lived Intangible Assets, Accumulated Amortization	(2,083)	(1,111)
Finite-Lived Intangible Assets, Net	$ 4,298	$ 5,270
Finite-Lived Intangible Assets, Remaining Amortization Period	5 years 2 months	6 years