Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Dec. 31, 2012
Other comprehensive income (before tax) [Abstract]
Change in unrealized gains and losses on investments	$ (10,539)		$ (46,926)
Unrealized foreign currency translation adjustment	486		1,667
Other comprehensive income (loss)	(10,053)		(45,259)
Other comprehensive income (tax) [Abstract]
Change in unrealized gains and losses on investments	3,592		16,256
Unrealized foreign currency translation adjustment	(170)		(584)
Other comprehensive income (loss)	3,422		15,672
Other comprehensive income (valuation allowance) [Abstract]
Change in unrealized investment gains and losses, net	(3,007)		(15,248)
Other comprehensive income foreign currency translation valuation allowance	0		0
Other comprehensive income (loss)	(3,007)		(15,248)
Other comprehensive income (net of tax) [Abstract]
Change in unrealized investment gains and losses on investments	(9,954)		(45,918)
Unrealized foreign currency translation adjustment	316		1,083
Other comprehensive income (loss)	(9,638)		(44,835)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	2,484
Other comprehensive income (loss) before reclassifications	(7,981)
Amounts reclassified from accumulated other comprehensive income (loss)	2,072
Other comprehensive income (loss)	(10,053)		(45,259)
Balance at end of period, before tax	(7,569)
Tax effect	(50,232)	[1]
Total accumulated other comprehensive income (loss), net of tax	(57,801)			(48,163)
Tax Effect due to valuation allowance (in hundredths)	35.00%
Unrealized gains and losses on available-for-sale securities [Member]
Other comprehensive income (before tax) [Abstract]
Other comprehensive income (loss)	(10,539)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	41,541
Other comprehensive income (loss) before reclassifications	(8,467)
Amounts reclassified from accumulated other comprehensive income (loss)	2,072	[2]
Other comprehensive income (loss)	(10,539)
Balance at end of period, before tax	31,002
Tax effect	(66,054)	[1]
Total accumulated other comprehensive income (loss), net of tax	(35,052)
Foreign currency translation [Member]
Other comprehensive income (before tax) [Abstract]
Other comprehensive income (loss)	486
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	32,747
Other comprehensive income (loss) before reclassifications	486
Amounts reclassified from accumulated other comprehensive income (loss)	0
Other comprehensive income (loss)	486
Balance at end of period, before tax	33,233
Tax effect	(11,118)	[1]
Total accumulated other comprehensive income (loss), net of tax	22,115
Defined benefit plans [Member]
Other comprehensive income (before tax) [Abstract]
Other comprehensive income (loss)	0
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	(71,804)
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified from accumulated other comprehensive income (loss)	0
Other comprehensive income (loss)	0
Balance at end of period, before tax	(71,804)
Tax effect	26,940	[1]
Total accumulated other comprehensive income (loss), net of tax	$ (44,864)

[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 months ended March 31, 2013, unrealized gains and losses of $2.1 million were reclassified to the Consolidated Statement of Operations and included in Realized investment gains.