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Marketable Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Marketable Securities [Line Items]    
Value at cost $ 79,885 $ 53,272
Gross unrealized holding gains 0 0
Gross unrealized holding losses (147) (198)
Fair value $ 79,738 $ 53,074