Accumulated Other Comprehensive Income (Loss) - Details About AOCI Components (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments sold	$ 22,956		$ 41,147
OTTI on investments	(2,276)		(3,727)
Total before tax	(19,119)		(36,400)
Provision (benefit) for income tax	(34,321)		(43,479)
Unrealized gains (losses) on investments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments sold	(24,914)		(45,422)
OTTI on investments	2,276		3,727
Total before tax	(22,638)	[1]	(41,695)
Provision (benefit) for income tax	453		274
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(22,185)		(41,421)
OTTI losses recognized in AOCI
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	3,409		5,185
Accumulated Translation Adjustment [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0		0
Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0		0
Cash flow hedge
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	110		110
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(19,119)		(36,400)
Provision (benefit) for income tax	340		271
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(18,779)		(36,129)
Reclassification out of Accumulated Other Comprehensive Income [Member] | OTTI losses recognized in AOCI
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments sold	1,958		4,275
OTTI on investments	1,451		910
Total before tax	3,409		5,185
Provision (benefit) for income tax	(113)		(3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	3,296		5,182
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash flow hedge
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	110		110
Provision (benefit) for income tax	0		0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 110		$ 110

[1] Included in these amounts are the impact of net unrealized gains (losses) on investments to the value of future policy benefit reserves. During the year ended December 31, 2013, the initial impact of $44.7 million was recorded. During the three months ended March 31, 2014, additional impacts of $34.0 million were recorded, resulting in a total cumulative impact of net unrealized gains (losses) on investments to the value of future policy benefit reserves of $78.7 million at March 31, 2014.