Reinsurance - Amounts Ceded Related to 2016 QSR Transaction (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Ceded Credit Risk [Line Items]    
Ceded premiums written $ (37,336) $ 0
Ceded premiums earned (1,244) $ 0
Third-Party Reinsurers    
Ceded Credit Risk [Line Items]    
Ceded risk-in-force 1,685,145  
Ceded premiums written (37,336)  
Ceded premiums earned (1,244)  
Ceding commission written 7,795  
Ceding commission earned $ (530)