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Investments (Summary Maturities of the Company's Marketable Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Investments [Abstract]    
Marketable Securities, Less than one year, Amortized Cost $ 143,634  
Marketable Securities, Less than one year, Fair Value 143,617  
Marketable Securities, Due in year two, Amortized Cost 12,199  
Marketable Securities, Due in year two, Fair Value 12,189  
Amortized Cost 155,833 12,981
Available-for-sale Securities $ 155,806 $ 13,597