Investments (Net Realized Investments Gains) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investments [Line Items]
Net realized investment gains (losses)	$ (11,422)	$ 66,380	$ 58,397
Swap [Member]
Investments [Line Items]
Net realized investment gains (losses)	2,176	0	0
Fixed Maturity Securities [Member]
Investments [Line Items]
Net realized investment gains (losses)	(95,225)	47,707	54,112
Equity Securities [Member]
Investments [Line Items]
Net realized investment gains (losses)	80,910	16,679	(4,854)
Short-Term Investments [Member]
Investments [Line Items]
Net realized investment gains (losses)	(1,059)	(686)	139
Option [Member]
Investments [Line Items]
Net realized investment gains (losses)	$ 1,776	$ 2,680	$ 9,000