Liability for Unpaid Claims and Claim Adjustment Expenses Schedule of Net Liability for Unpaid Losses and Loss Adjustment Expenses of Short-Duration Contracts - Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Policy liabilities and unpaid claims balance at January 1			$ 103,391	$ 80,663
Policyholder Funds			(17,417)	(19,037)
Non-insurance warranty benefit claim liabilities			(91)	(116)
Liability for Claims and Claims Adjustment Expense			85,883	61,510
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net			22,563	19,006
Policyholder Benefits and Claims Incurred [Abstract]
Current Year Claims and Claims Adjustment Expense			50,925	34,149
Prior Year Claims and Claims Adjustment Expense			2,972	78
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	$ 25,209	$ 16,701	53,897	34,227
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year			34,238	18,934
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years			17,653	12,234
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid			51,891	31,168
Liability for Claims and Claims Adjustment Expense	94,542	79,493	94,542	79,493
Policyholder Funds	(16,312)	(17,984)	(16,312)	(17,984)
Non-insurance warranty benefit claim liabilities	(41)	(134)	(41)	(134)
Policy liabilities and unpaid claims balance at June 30,	110,895	97,611	110,895	97,611
Other Short-duration Insurance Product Line [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments			(63,112)	(42,341)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	24,569	22,065	24,569	22,065
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	(69,772)	(57,235)	(69,772)	(57,235)
Other Insurance Product Line [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments			(208)	(163)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	$ (201)	$ (193)	$ (201)	$ (193)