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Summary Of Significant Accounting Policies Summary of Significant Accounting Policies (Available-for-Sale Securities) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Available-for-sale Securities [Abstract]    
Proceeds from Sale of Available-for-sale Securities $ 0 $ 14,612
Available-for-sale Securities, Gross Realized Gains   3
Available-for-sale Securities, Gross Realized Losses   $ (735)