Investments (Details - Maturity profile, securities purchased, sold and pledged assets) (Trading securities [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest Rate Disclosures [Abstract]
Low end of interest rate on funds held	1.80%	2.00%	2.00%
High end of interest rate on funds held	4.30%	5.00%	5.00%
Pledged Assets
Restricted cash	$ 200,600,000	$ 167,500,000
Restricted securities	2,477,800,000	2,532,000,000
Equity securities [Member]
Pledged Assets
Restricted securities	121,000,000
Cost [Member]
Maturity Profile [Abstract]
One year or less	373,899,000
More than one year through five years	4,915,255,000
More than five years through ten years	3,920,421,000
More than ten years	723,842,000
Subtotal	9,933,417,000
Mortgage/asset-backed securities	3,456,581,000
Total	13,389,998,000
Fair value [Member]
Maturity Profile [Abstract]
One year or less	377,568,000
More than one year through five years	5,056,690,000
More than five years through ten years	3,961,736,000
More than ten years	768,360,000
Subtotal	10,164,354,000
Mortgage/asset-backed securities	3,442,495,000
Total	13,606,849,000
Net Receivable (Payable) for Securites Sold/Purchased
Receivable for securities sold	150,816,000	22,133,000
Payable for securities purchased	(60,153,000)	(32,944,000)
Net receivable (payable) for securities sold/purchased	$ 90,663,000	$ (10,811,000)