Premium Deficiency Reserve (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Premium Deficiency Reserve [Abstract]
Present value of expected future paid losses and expenses, net of expected future premium	$ (519,000,000)	$ (622,000,000)	$ (554,000,000)
Established loss reserves	502,000,000	579,000,000	530,000,000
Net deficiency	17,333,000	(43,000,000)	23,751,000
Change in premium deficiency reserve	$ 7,000,000	$ 5,000,000