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Related Party Transactions - Transactions with USAA (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]      
Amounts due from related party $ 393 $ 328  
USAA      
Related Party Transaction [Line Items]      
Amounts due from related party 400 300  
Total amounts due 3,900 7,800  
Related party payables 2,925 7,490  
Related party accrued expense and other current liabilities 992 318  
USAA | Selling and Marketing Expense      
Related Party Transaction [Line Items]      
Sales and marketing expense $ 13,900 $ 14,000 $ 15,200