Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Schedule of accumulated other comprehensive income (loss)
Unrealized Gains and Losses on Fixed Maturities and Equity Securities, Beginning balance	$ 196,847	[1],[2]		$ 382,400	[1],[2]
Unrealized Gains and Losses on Fixed Maturities and Equity Securities, Other comprehensive income (loss) before reclassifications	(37,211)	[1],[2]		(208,283)	[1],[2]
Unrealized Gains and Losses on Fixed Maturities and Equity Securities, Amounts reclassified from accumulated other comprehensive income	915	[1],[2]		(13,566)	[1],[2]
Unrealized Gains and Losses on Fixed Maturities and Equity Securities, Net current-period other comprehensive income (loss)	(36,296)	[1],[2]	61,557	(221,849)	[1],[2]	127,979
Unrealized Gains and Losses on Fixed Maturities and Equity Securities, Ending balance	160,551	[1],[2]		160,551	[1],[2]
Defined Benefit Plans, Beginning balance	(15,311)	[1]		(15,311)	[1]
Defined Benefit Plans, Ending balance	(15,311)	[1]		(15,311)	[1]
Total, Beginning balance	181,536	[1]		367,089	[1]
Total, Other comprehensive income (loss) before reclassifications	(37,211)	[1]		(208,283)	[1]
Total, Amounts reclassified from accumulated other comprehensive income	915	[1]		(13,566)	[1]
Total, Net current-period other comprehensive income (loss)	(36,296)	[1]	61,557	(221,849)	[1]	127,979
Total, Ending balance	$ 145,240	[1]		$ 145,240	[1]

[1] All amounts are net of tax.

[2] The pretax amounts reclassified from accumulated other comprehensive income, $(1,407) and $20,872, are included in net realized investment gains and losses and the related tax expenses (benefits), $(492) and $7,306, are included in income tax expense in the Consolidated Statements of Operations for the three and nine months ended September 30, 2013, respectively.