Other Comprehensive Income (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	Dec. 31, 2012
Other comprehensive income (before tax) [Abstract]
Change in unrealized gains and losses on investments	$ (99,092)		$ 9,801	$ (109,631)		$ (37,125)
Unrealized foreign currency translation adjustment	(19,255)		(1,116)	(18,769)		551
Other comprehensive income (loss)	(118,347)		8,685	(128,400)		(36,574)
Other comprehensive income (tax) [Abstract]
Change in unrealized gains and losses on investments	34,520		(3,166)	38,112		13,090
Unrealized foreign currency translation adjustment	6,743		392	6,573		(192)
Other comprehensive income (loss)	41,263		(2,774)	44,685		12,898
Other comprehensive income (valuation allowance) [Abstract]
Change in unrealized investment gains and losses, net	(33,547)		1,577	(36,554)		(13,671)
Other comprehensive income foreign currency translation valuation allowance	0		0	0		0
Other comprehensive income (loss)	(33,547)		1,577	(36,554)		(13,671)
Other comprehensive income (net of tax) [Abstract]
Change in unrealized investment gains and losses on investments	(98,119)		8,212	(108,073)		(37,706)
Unrealized foreign currency translation adjustment	(12,512)		(724)	(12,196)		359
Other comprehensive income (loss)	(110,631)		7,488	(120,269)		(37,347)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	(7,569)			2,484
Other comprehensive income (loss) before reclassifications	(116,193)			(122,868)
Amounts reclassified from accumulated other comprehensive income (loss)	2,154			5,532
Net current period other comprehensive income (loss)	(118,347)		8,685	(128,400)		(36,574)
Balance at end of period, before tax	(125,916)			(125,916)
Tax effect	(42,516)	[1]		(42,516)	[1]
Total accumulated other comprehensive income (loss), net of tax	(168,432)			(168,432)			(48,163)
Tax Effect due to valuation allowance (in hundredths)	35.00%			35.00%
Unrealized gains and losses on available-for-sale securities [Member]
Other comprehensive income (before tax) [Abstract]
Other comprehensive income (loss)	(99,092)			(109,631)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	31,002			41,541
Other comprehensive income (loss) before reclassifications	(96,938)			(104,099)
Amounts reclassified from accumulated other comprehensive income (loss)	2,154	[2]		5,532	[2]
Net current period other comprehensive income (loss)	(99,092)			(109,631)
Balance at end of period, before tax	(68,090)			(68,090)
Tax effect	(65,082)	[1]		(65,082)	[1]
Total accumulated other comprehensive income (loss), net of tax	(133,172)			(133,172)
Defined benefit plans [Member]
Other comprehensive income (before tax) [Abstract]
Other comprehensive income (loss)	0			0
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	(71,804)			(71,804)
Other comprehensive income (loss) before reclassifications	0			0
Amounts reclassified from accumulated other comprehensive income (loss)	0			0
Net current period other comprehensive income (loss)	0			0
Balance at end of period, before tax	(71,804)			(71,804)
Tax effect	26,940	[1]		26,940	[1]
Total accumulated other comprehensive income (loss), net of tax	(44,864)			(44,864)
Foreign currency translation [Member]
Other comprehensive income (before tax) [Abstract]
Other comprehensive income (loss)	(19,255)			(18,769)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	33,233			32,747
Other comprehensive income (loss) before reclassifications	(19,255)			(18,769)
Amounts reclassified from accumulated other comprehensive income (loss)	0			0
Net current period other comprehensive income (loss)	(19,255)			(18,769)
Balance at end of period, before tax	13,978			13,978
Tax effect	(4,374)	[1]		(4,374)	[1]
Total accumulated other comprehensive income (loss), net of tax	$ 9,604			$ 9,604

[1] Tax effect does not approximate 35% due to amounts of tax benefits not provided in various periods due to our tax valuation allowance.

[2] During the three and six months ended June 30, 2013, net unrealized gains of $2.2 million and $5.5 million, respectively, were reclassified to the Consolidated Statement of Operations and included in Realized investment gains.