Nature of Business and Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Jun. 30, 2015	Jun. 30, 2014
Nature of Business and Basis of Presentation [Abstract]
Holding company cash and investments			$ 463,000
PMIERs tables expected review period			2 years
Notice period for updates to PMIERs tables			180 days
(Increase) decrease in restricted cash	$ 42,900	$ (60,300)	$ 17,212	$ 237