Investments (Unrealized Losses) (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
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Credit impairment reported in earnings	$ 0	$ 13	$ 35	$ 252
Asset-Backed Security [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Securities, other-than-temporarily impaired	1
Credit impairment reported in earnings	$ 7
Equity Securities [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	17		17
Other-than-temporarily impaired securities, number of securities rated investment grade	1		1
Debt Securities [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of issues	259		259
Gross unrealized losses, percentage of total debt	19.70%		19.70%
Gross unrealized losses, market value as a percent of amortized cost	97.70%		97.70%
Gross unrealized losses, number of securities with maturities of 12 months or greater	190		190
Gross unrealized losses, number of securities with maturities of 12 months or greater (as a percentage)	71.20%		71.20%
External Credit Rating, Investment Grade [Member] | Debt Securities [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	254		254