Summary of Significant Accounting Policies (Details 8) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Beginning balance, January 1, 2013	$ 367,089	[1]
Other comprehensive income (loss) before reclassifications	(230,416)	[1]
Amounts reclassified from accumulated other comprehensive income	(14,459)	[1]
Net current-period other comprehensive income (loss)	(244,875)	[1]	115,109		153,867
Ending balance, December 31, 2013	122,214	[1]	367,089	[1]
Unrealized Gains and Losses on Fixed Maturities and Equity Securities
Beginning balance, January 1, 2013	382,400	[1],[2]
Other comprehensive income (loss) before reclassifications	(233,951)	[1],[2]
Amounts reclassified from accumulated other comprehensive income	(14,459)	[1],[2]
Net current-period other comprehensive income (loss)	(248,410)	[1],[2]	114,178		156,954
Ending balance, December 31, 2013	133,990	[1],[2]	382,400	[1],[2]
Defined BenefitPlans
Beginning balance, January 1, 2013	(15,311)	[1]
Other comprehensive income (loss) before reclassifications	3,535	[1]
Amounts reclassified from accumulated other comprehensive income	0	[1]
Net current-period other comprehensive income (loss)	3,535	[1]
Ending balance, December 31, 2013	$ (11,776)	[1]	$ (15,311)	[1]

[1] All amounts are net of tax.

[2] The $22,245 pretax amount reclassified from accumulated other comprehensive income is included in net realized investment gains and losses and the $7,786 related tax expense (benefit) is included in income tax expense in the Consolidated Statement of Operations for the year ended December 31, 2013.