Quarterly Financial Information (Narrative) (Details) - USD ($)	3 Months Ended			12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve
Net realized investment losses (gains)	$ 8,200,000	$ 21,600,000		$ 83,807,000	$ (81,184,000)	$ 11,422,000
Settlement of fine and penalty levied by California DOI					$ 27,593,550
Employee Severance [Member]
Restructuring Cost and Reserve
Workforce reduction, office closure and severance expense			$ 10,000,000