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Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Related Party Transactions
Receivable from related party	$ 218		$ 218		$ 393
USAA
Related Party Transactions
Receivable from related party	200		200		400
Due to Related Parties	4,400		4,400		$ 3,900
USAA \| Sales and marketing
Related Party Transactions
Costs under related party agreements	$ 4,200	$ 3,700	$ 12,800	$ 10,400