Fair Value (Details - Level 3 narrative items) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value - Other Details [Line Items]
Cash and cash equivalents	$ 1,496,485,000	$ 1,121,705,000	$ 1,342,257,000	$ 2,111,084,000
Accrued investment income	185,717,000	184,315,000
Funds held directly managed [Member]
Fair Value - Other Details [Line Items]
Cash and cash equivalents	84,800,000	53,700,000
Accrued investment income	6,700,000	10,200,000
Other net assets	133,000,000	33,600,000
Trading securities [Member] | Other invested assets [Member]
Fair Value - Other Details [Line Items]
Aggregate carrying amount of other invested assets not carried at fair value	185,800,000	262,200,000
Trading securities [Member] | Equity securities [Member]
Fair Value - Other Details [Line Items]
Fair Value Assets Level 2 To Level 1 Transfers Amount	$ 0	$ 1,100,000