Investments (Details 7) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Reconciliation of net unrealized investment gains (losses) on fixed maturity securities and equity securities
Reclassification of net realized investment (gains) losses to net income	$ (14,459)	[1],[2]
Fixed Maturity Securities [Member]
Reconciliation of net unrealized investment gains (losses) on fixed maturity securities and equity securities
Beginning of period	423,004		284,338	118,498
Change in unrealized investment gains and losses	(264,503)		153,758	190,193
Reclassification of net realized investment (gains) losses to net income	(12,012)		(15,092)	(24,353)
End of period	146,489		423,004	284,338
Equity Securities [Member]
Reconciliation of net unrealized investment gains (losses) on fixed maturity securities and equity securities
Beginning of period	720		2,408	2,139
Change in unrealized investment gains and losses	6,345		964	397
Reclassification of net realized investment (gains) losses to net income	(2,447)		(2,652)	(128)
End of period	$ 4,618		$ 720	$ 2,408

[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.