Fair Value (Details - narrative items) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Fair Value - Other Details [Line Items]
Cash and cash equivalents	$ 1,519,287,000	$ 1,496,485,000	$ 1,551,062,000	$ 1,121,705,000
Accrued investment income	171,050,000	185,717,000
Fair Value Assets Level 2 To Level 1 Transfers Amount	0		0
Fair Value Assets Level 2 To Level 1 Transfers Amount 2	0		0
Funds held directly managed [Member]
Fair Value - Other Details [Line Items]
Cash and cash equivalents	53,100,000	84,800,000
Accrued investment income	6,300,000	6,700,000
Other net assets	112,000,000	133,000,000
Trading securities [Member] | Other invested assets [Member]
Fair Value - Other Details [Line Items]
Carrying amount of other invested assets not at fair value	$ 194,700,000	$ 185,800,000