Fair Value Measurements (Contractual Maturities of Available for Sale Investments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total debt securities	$ 11,445
Municipal Bonds — Available for Sale
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maturing in one year or less	1,846	5,164
Maturing after one year through three years	7,113	12,134
Maturing after three years	2,486	4,024
Total debt securities	$ 11,445	$ 21,322