Funds Held - Directly Managed (Details - Maturity Profile) ([FundsHeldDirectlyManagedMember], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Funds Held Directly Managed Other Details [Line Items]
Cash and cash equivalents	$ 53,700,000	$ 176,300,000
Accrued investment income	10,200,000	13,700,000
Other assets	33,400,000	20,300,000
Assets Released From Funds Held Directly Managed On Endorsement Of Agreement	358,000,000
Settlement Of Cumulative Net Favorable Prior Year Loss Development On Guaranteed Reserves	265,000,000
[CostMember]
Maturity Profile [Abstract]
One year or less	131,909,000
More than one year through five years	491,667,000
More than five years through ten years	124,560,000
More than ten years	23,007,000
Total	771,143,000
[FairValueMember]
Maturity Profile [Abstract]
One year or less	133,187,000
More than one year through five years	515,432,000
More than five years through ten years	140,641,000
More than ten years	26,011,000
Total	$ 815,271,000