Investments (Fixed Maturities Proceeds)(Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Fixed maturity and equity security impairments
Net writedowns for other-than-temporary impairment losses on fixed maturities recognized in earnings	$ 0	[1]	$ (83)	[1]	$ 0	[1]	$ (152)	[1]
Writedowns for impairments on equity securities	0		0		0		0
Equity Securities [Member]
Available For Sale
Proceeds from sales	0		0		1		0
Proceeds from maturities/repayments	0		0		0		0
Gross investment gains from sales	(1)		0		0		0
Available-for-sale Securities, Gross Realized Losses	0		0		0		0
Fixed Maturities, Available For Sale [Member]
Available For Sale
Proceeds from sales	6,501		33,498		121,428		316,818
Proceeds from maturities/repayments	386,663		224,664		593,078		373,805
Gross investment gains from sales	4,093		6,894		6,885		14,032
Available-for-sale Securities, Gross Realized Losses	$ 17		$ 23		$ 97		$ 24

[1] Excludes the portion of other-than-temporary impairments recorded in “Other comprehensive income (loss),” representing any difference between the fair value of the impaired debt security and the net present value of its projected future cash flows at the time of impairment.