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Marketable Securities (Summary of Investment Securities in an Unrealized Loss Position) (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Investments, Debt and Equity Securities [Abstract]  
Unrealized Losses, Less than 12 months
Unrealized Losses, 12 months or more (159)
Unrealized Losses, Total (159)
Fair value, Less than 12 months
Fair value, 12 months or more 24,046
Fair value, Total $ 24,046