Fair Value (Details - narrative items) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Fair Value - Other Details [Line Items]
Funds held directly managed investments carried at fair value	$ 415,357	$ 472,593
Cash and cash equivalents	1,256,304	1,313,468	$ 1,519,287	$ 1,496,485
Accrued investment income	142,892	158,737
Fair Value Assets Level 2 To Level 1 Transfers Amount	0		$ 0
Funds held directly managed [Member]
Fair Value - Other Details [Line Items]
Cash and cash equivalents	64,200	42,300
Accrued investment income	5,400	5,700
Other net assets	110,700	88,300
Trading securities [Member] | Other invested assets [Member]
Fair Value - Other Details [Line Items]
Carrying amount of other invested assets not at fair value	$ 200,200	$ 187,300