Accumulated Other Comprehensive Income (Loss) - Details About AOCI Components (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		$ (110,615)	$ (85,884)	$ (225,457)	$ (150,633)
Tax benefit (expense)		(2,467)	(32,959)	(24,762)	(57,177)
Unrealized gains (losses) on investments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	[1]	(112,377)	(87,558)	(229,491)	(162,338)
OTTI losses recognized in AOCI
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		1,810	1,662	4,121	11,598
Accumulated Translation Adjustment [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		0	0	0	0
Underfunded pension liability
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		(48)	12	(87)	107
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		(110,615)	(85,884)	(225,457)	(150,633)
Tax benefit (expense)		1,675	3,682	3,208	3,766
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(108,940)	(82,202)	(222,249)	(146,867)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized gains (losses) on investments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments sold		(139,457)	(71,027)	(256,445)	(149,578)
OTTI on investments		33,030	19,398	54,958	35,122
Total before tax		(112,377)	(87,558)	(229,491)	(162,338)
Tax benefit (expense)		1,633	3,694	3,210	3,781
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(110,744)	(83,864)	(226,281)	(158,557)
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		2,066	1,594	4,379	11,469
OTTI on investments		(256)	68	(258)	129
Total before tax		1,810	1,662	4,121	11,598
Tax benefit (expense)		42	(12)	(2)	(15)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		1,852	1,650	4,119	11,583
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash flow hedge
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		(48)	12	(87)	107
Tax benefit (expense)		0	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(48)	12	(87)	107
Life Funds Withheld Assets
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments sold		30,114	68,037	64,530	120,775
OTTI on investments		(252)	(2,878)	(2,598)	(8,087)
Change in adjustments related to future policy benefit reserves, net of tax		(5,950)	(35,929)	(28,003)	(47,883)
Life Funds Withheld Assets | Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized gains (losses) on investments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Change in adjustments related to future policy benefit reserves, net of tax		$ (5,950)	$ (35,929)	$ (28,004)	$ (47,882)

[1] . As of December 31, 2015, the cumulative impact of the Shadow Adjustments was $274.4 million. During the six months ended June 30, 2016, net movements of $(25.8) million were recorded, resulting in a total cumulative net impact of Shadow Adjustments on future policy benefit reserves of $248.7 million as of June 30, 2016.