Investment Information - Other than temporary impairments rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Rollforward:
Balance at start of period	$ 60,062	$ 62,001
Credit loss impairments recognized on securities not previously impaired	0	33
Credit loss impairments recognized on securities previously impaired	6	2
Reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security	0	0
Reductions for securities sold during the period	(12,812)	(80)
Balance at end of period	$ 47,256	$ 61,956