Investments (Schedule of Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Due in one year or less, Amortized Cost	$ 63,230
Due after one year through five years, Amortized Cost	153,969
Due after five years through ten years, Amortized Cost	96,692
Due after ten years, Amortized Cost	52,424
Debt Maturities, Amortized Cost	395,860
Due in one year or less, Fair Value	63,768
Due after one year through five years, Fair Value	154,311
Due after five years through ten years, Fair Value	97,585
Due after ten years, Fair Value	51,891
Debt Securities, Fair Value	396,647	401,435
Mortgage Backed [Member]
Schedule of Investments [Line Items]
Debt Maturities, Amortized Cost	29,545
Debt Securities, Fair Value	$ 29,092	$ 9,724

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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