Statutory Accounting Practices Disclosure - Assessments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Expected Recoveries of Assessments [Roll Forward]
Expected Recoveries of Assessments 1	$ 0	$ 0	$ 0	$ 7
Assessments Expensed	1,472	226	72
Assessments Recovered	0	1	(2)
Assessments Not Recoverable 1	$ 1,472	$ 227	$ 77