Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Other comprehensive income (loss) (before tax) [Abstract]
Change in unrealized gains and losses on investments	$ 91,782		$ (126,175)		$ (78,546)
Benefit plans adjustments	(52,112)		68,038		(1,221)
Unrealized foreign currency translation adjustment	(4,067)		(21,563)		2,452
Other comprehensive income (loss)	35,603		(79,700)		(77,315)
Other comprehensive income (loss) (tax effects) [Abstract]
Change in unrealized gains and losses on investments	(32,017)		43,732		27,510
Benefit plan adjustments	18,239		(23,813)		428
Unrealized foreign currency translation adjustment	1,425		7,553		(859)
Other comprehensive income (loss)	(12,353)		27,472		27,079
Other comprehensive income (loss) (valuation allowance) [Abstract]
Change in unrealized gains and losses on investments	31,374		(41,148)		(27,623)
Benefit plan adjustments	(18,239)		23,813		(428)
Unrealized foreign currency translation adjustment	0		0		0
Other comprehensive income (loss)	13,135		(17,335)		(28,051)
Other comprehensive income (loss) (net of tax) [Abstract]
Change in unrealized investment gains and losses on investments	91,139		(123,591)		(78,659)
Benefit plan adjustment	(52,112)		68,038		(1,221)
Unrealized foreign currency translation adjustment	(2,642)		(14,010)		1,593
Other comprehensive income (loss)	36,385		(69,563)		(78,287)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	(77,216)		2,484		79,799
Other comprehensive income (loss) before reclassifications	29,045		(66,191)		22,867
Less: Amounts reclassified from accumulated other comprehensive income (loss)	(6,558)		13,509		100,182
Other comprehensive income (loss)	35,603		(79,700)		(77,315)
Balance at end of period, before tax	(41,613)		(77,216)		2,484
Tax effect	(39,728)	[1]	(40,510)	[1]	(50,647)	[1]
Balance at end of period, net of tax	(81,341)		(117,726)		(48,163)
Tax Effect due to valuation allowance (in hundredths)	35.00%		(35.00%)		(35.00%)
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Other comprehensive income (loss) (before tax) [Abstract]
Other comprehensive income (loss)	91,782		(126,175)		(78,546)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	(84,634)		41,541		120,087
Other comprehensive income (loss) before reclassifications	78,294		(112,667)		22,710
Less: Amounts reclassified from accumulated other comprehensive income (loss)	(13,488)	[2]	13,508	[2]	101,256	[2]
Other comprehensive income (loss)	91,782		(126,175)		(78,546)
Balance at end of period, before tax	7,148		(84,634)		41,541
Tax effect	(64,699)	[1]	(64,056)	[1]	(66,640)	[1]
Balance at end of period, net of tax	(57,551)		(148,690)		(25,099)
Defined Benefit Plans [Member]
Other comprehensive income (loss) (before tax) [Abstract]
Other comprehensive income (loss)	(52,112)		68,038		(1,222)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	(3,766)		(71,804)		(70,582)
Other comprehensive income (loss) before reclassifications	(45,182)		68,039		(2,296)
Less: Amounts reclassified from accumulated other comprehensive income (loss)	6,930	[3]	1	[3]	(1,074)	[3]
Other comprehensive income (loss)	(52,112)		68,038		(1,222)
Balance at end of period, before tax	(55,878)		(3,766)		(71,804)
Tax effect	26,940	[1]	26,940	[1]	26,940	[1]
Balance at end of period, net of tax	(28,938)		23,174		(44,864)
Foreign Currency Translation [Member]
Other comprehensive income (loss) (before tax) [Abstract]
Other comprehensive income (loss)	(4,067)		(21,563)		2,453
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	11,184		32,747		30,294
Other comprehensive income (loss) before reclassifications	(4,067)		(21,563)		2,453
Less: Amounts reclassified from accumulated other comprehensive income (loss)	0		0		0
Other comprehensive income (loss)	(4,067)		(21,563)		2,453
Balance at end of period, before tax	7,117		11,184		32,747
Tax effect	(1,969)	[1]	(3,394)	[1]	(10,947)	[1]
Balance at end of period, net of tax	$ 5,148		$ 7,790		$ 21,800

[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 2014, 2013 and 2012, net unrealized (losses) gains of ($13.5) million, $13.5 million and $101.3 million, respectively, were reclassified to the Consolidated Statement of Operations and included in Realized investment gains.

[3] For the years ended December 31, 2014, 2013 and 2012, other comprehensive income (loss) related to benefit plans of $6.9 million, $1 thousand, and ($1.1) million, respectively, was reclassified to the Consolidated Statements of Operations and included in Underwriting and other expenses, net.