Accumulated Other Comprehensive Income (Loss) - Details About AOCI Components (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ (72,587)		$ (40,858)	$ (91,706)		$ (77,257)
Tax benefit (expense)	5,654		(28,872)	(28,667)		(72,351)
Unrealized gains (losses) on investments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments sold	(107,470)		(56,969)	(132,384)		(102,391)
OTTI on investments	33,133		1,561	35,409		5,289
Total before tax	(74,337)	[1]	(55,408)	(96,975)	[1]	(97,102)
Tax benefit (expense)	1,477		(3,560)	1,930		(3,286)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(72,860)		(58,968)	(95,045)		(100,388)
OTTI losses recognized in AOCI
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	1,640		14,440	5,049		19,625
Accumulated Translation Adjustment [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0		0	0		0
Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0		0	0		0
Cash flow hedge
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	110		110	220		220
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(72,587)		(40,858)	(91,706)		(77,257)
Tax benefit (expense)	1,473		(3,562)	1,813		(3,291)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(71,114)		(44,420)	(89,893)		(80,548)
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	1,386		13,612	3,344		17,887
OTTI on investments	254		828	1,705		1,738
Total before tax	1,640		14,440	5,049		19,625
Tax benefit (expense)	(4)		(2)	(117)		(5)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1,636		14,438	4,932		19,620
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	220		220
Tax benefit (expense)	0		0	0		0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 110		$ 110	$ 220		$ 220

[1] Included in these amounts are the impact of Shadow Adjustments. During the year ended December 31, 2013, the initial impact of $44.7 million was recorded. During the six months ended June 30, 2014, additional impacts of $474.5 million were recorded, resulting in a total cumulative impact of shadow adjustments on future policy benefit reserves of $519.2 million at June 30, 2014.