Investments (Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Credit impairment reported in earnings	$ 35	$ 61
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	15
Other-than-temporarily impaired securities, number of securities rated investment grade	1
Debt Securities [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of issues	303
Gross unrealized losses, percentage of total debt	23.50%
Gross unrealized losses, market value as a percent of amortized cost	96.30%
Gross unrealized losses, number of securities with maturities of 12 months or greater	83
Gross unrealized losses, number of securities with maturities of 12 months or greater (as a percentage)	27.40%
Debt Securities [Member] | Investment Grade [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	297