Reserves for Losses and Loss Adjustment Expenses - Activity (Details) $ in Thousands	Dec. 31, 2016 USD ($) claim	Dec. 31, 2015 USD ($)
Insurance Incurred and Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
Total paid	$ 457,891
Total incurred	482,997
All Outstanding reserves prior to 2012, net of reinsurance	97
Reserve for unpaid losses and LAE balance, net	25,203	$ 29,522
2012
Insurance Incurred and Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
Total paid	112,062
Total incurred	114,517
Total of IBNR Reserves Plus Expected Development on Reported claims	$ 38
Cumulative Number of Reported Claims | claim	16,555
2013
Insurance Incurred and Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
Total paid	$ 109,662
Total incurred	111,011
Total of IBNR Reserves Plus Expected Development on Reported claims	$ 90
Cumulative Number of Reported Claims | claim	15,569
2014
Insurance Incurred and Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
Total paid	$ 81,684
Total incurred	84,221
Total of IBNR Reserves Plus Expected Development on Reported claims	$ 392
Cumulative Number of Reported Claims | claim	12,927
2015
Insurance Incurred and Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
Total paid	$ 82,940
Total incurred	88,477
Total of IBNR Reserves Plus Expected Development on Reported claims	$ 3,314
Cumulative Number of Reported Claims | claim	14,723
2016
Insurance Incurred and Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
Total paid	$ 71,543
Total incurred	84,771
Total of IBNR Reserves Plus Expected Development on Reported claims	$ 7,150
Cumulative Number of Reported Claims | claim	20,336