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Investments in Marketable Securities Available-for-Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Aggregate Cost $ 10,907 $ 10,507
Gross Unrealized Gains 48 49
Gross Unrealized Losses (76) (399)
Aggregate Market Value 10,879 10,157
Money Market Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate Cost 473 4,968
Gross Unrealized Gains 48 49
Gross Unrealized Losses 0 0
Aggregate Market Value 521 5,017
Time deposit with original maturities more than three months    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate Cost 10,434 5,539
Gross Unrealized Gains 0 0
Gross Unrealized Losses (76) (399)
Aggregate Market Value $ 10,358 $ 5,140