Reserves for Unpaid Losses and Loss Adjustment Expenses Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Claims Development [Line Items]
Adverse (favorable) development on prior year loss reserves	$ (8,350)	$ (5,722)
Accident Year 2016-2018 [Member]
Claims Development [Line Items]
Adverse (favorable) development on prior year loss reserves	(14,800)
Accident Year 2016-2017 [Member]
Claims Development [Line Items]
Adverse (favorable) development on prior year loss reserves		(8,100)
Accident Year 2011-2015 [Member]
Claims Development [Line Items]
Adverse (favorable) development on prior year loss reserves	$ 6,400	$ 2,400