Investments - Roll-forward of OTTI (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Gross Other-Than-Temporary Impairments
Gross Other-Than-Temporary Impairments, Beginning Balance	$ (1,100)
Change in market value on a security for which an OTTI was not previously recognized, Gross Other-Than-Temporary Impairments	(151)
Principal received on OTTI security, Gross Other-Than-Temporary Impairments	0
Gross Other-Than-Temporary Impairments, Ending Balance	(1,251)
Other-Than-Temporary Impairments Included in Other Comprehensive Loss
Other-Than Temporary Impairments Included in Other Comprehensive Income, Beginning Balance	(547)
Change in market value on a security for which an OTTI was not previously recognized, Other-Than-Temporary Impairments Included in Other Comprehensive Loss	(151)
Principal received on OTTI security, Other-Than-Temporary Impairments Included in Other Comprehensive Loss	0
Other-Than Temporary Impairments Included in Other Comprehensive Income, Ending Balance	(698)
Net Other-Than Temporary Impairments Included in Retained Earnings (Deficit)
Net Other-Than Temporary Impairments Included in Retained Earnings (Deficit), Beginning Balance	(553)
Change in market value on a security for which an OTTI was not previously recognized, Net Other-Than-Temporary Impairments Included in Retained Earnings (Deficit)	0
Principal received on OTTI security, Net Other-Than-Temporary Impairments Included in Retained Earnings (Deficit)	0
Net Other-Than Temporary Impairments Included in Retained Earnings (Deficit), Ending Balance	$ (553)