Deferred Acquisition Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Deferred Acquisition Costs
Beginning balance, net	$ 7,220	$ 6,428	$ 6,904	$ 6,325
Additions	1,500	1,256	2,701	2,498
Amortization	(996)	(1,022)	(1,881)	(2,161)
Balance at June 30, net	$ 7,724	$ 6,662	$ 7,724	$ 6,662