Deferred Acquisition Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Deferred Acquisition Costs
Beginning balance, net	$ 8,247	$ 6,899	$ 8,247	$ 6,899	$ 7,724	$ 6,904	$ 6,662	$ 6,325
Additions	1,615	1,047	4,316	3,545
Amortization	(1,092)	(810)	(2,973)	(2,971)
Balance at September 30, net	$ 8,247	$ 6,899	$ 8,247	$ 6,899