Funds Held - Directly Managed Maturity Profile - (Details) - Funds held directly managed [Member] $ in Thousands	Dec. 31, 2015 USD ($)
Amortized Cost
Maturity Profile [Line Items]
One year or less	$ 72,450
More than one year through five years	187,504
More than five years through ten years	96,533
More than ten years	20,125
Total	376,612
Fair Value
Maturity Profile [Line Items]
One year or less	73,144
More than one year through five years	195,500
More than five years through ten years	100,700
More than ten years	20,409
Total	$ 389,753