Liability for Unpaid Losses and Loss Adjustment Expenses - Summary of Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 708,970
All outstanding liabilities before 2012, net of reinsurance	381
Liabilities for claims and claim adjustment expenses, net of reinsurance	45,127
Accident Year 2012 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	98,510	$ 97,962	$ 94,817	$ 89,039	$ 54,155
Accident Year 2013 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	95,059	93,489	88,843	$ 61,117
Accident Year 2014 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	119,798	112,059	$ 69,703
Accident Year 2015 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	191,481	$ 115,328
Accident Year 2016 [Member]
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 204,122