Fair Value (Details - Level 3 narrative items) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Fair Value - Other Details [Line Items]
Cash and cash equivalents	$ 1,269,037,000	$ 1,496,485,000	$ 1,286,898,000	$ 1,121,705,000
Accrued investment income	190,169,000	185,717,000
Funds held directly managed [Member]
Fair Value - Other Details [Line Items]
Cash and cash equivalents	37,100,000	84,800,000
Accrued investment income	7,500,000	6,700,000
Funds held directly managed [Member] | Other invested assets [Member]
Fair Value - Other Details [Line Items]
Carrying amount of other invested assets not at fair value	123,500,000	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	189,200,000	185,800,000
Trading securities [Member] | Equity securities [Member]
Fair Value - Other Details [Line Items]
Fair Value Assets Level 2 To Level 1 Transfers Amount	$ 0		$ 0