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Investments (Net Investment Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Investment Income [Line Items]
Net investment income earned	$ 34,292	$ 32,457	$ 106,600	$ 99,330
Fixed Income Securities [Member]
Net Investment Income [Line Items]
Net investment income earned	30,706	30,569	95,515	90,956
Equity Securities [Member]
Net Investment Income [Line Items]
Net investment income earned	1,909	1,341	5,094	4,422
Short-Term Investments [Member]
Net Investment Income [Line Items]
Net investment income earned	15	21	48	102
Other Investments [Member]
Net Investment Income [Line Items]
Net investment income earned	3,906	2,639	12,677	10,110
Investment Expenses [Member]
Net Investment Income [Line Items]
Net investment income earned	$ (2,244)	$ (2,113)	$ (6,734)	$ (6,260)