Reserves for Unpaid Losses and Loss Adjustment Expenses Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Claims Development [Line Items]
Adverse (favorable) development on prior year loss reserves	$ (7,816)	$ (3,523)
Accident Year 2017-2018 [Member]
Claims Development [Line Items]
Adverse (favorable) development on prior year loss reserves	(14,100)
Accident Year 2011-2016 [Member]
Claims Development [Line Items]
Adverse (favorable) development on prior year loss reserves	$ 6,200
Accident Year 2015-2017 [Member]
Claims Development [Line Items]
Adverse (favorable) development on prior year loss reserves		(6,300)
Accident Year 2011-2014 [Member]
Claims Development [Line Items]
Adverse (favorable) development on prior year loss reserves		$ 2,800