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Marketable Securities (Marketable securities classified as available-for-sale) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 137,569 $ 135,786
Gross Unrealized Gains 29 8
Gross Unrealized Losses (50) (73)
Fair Value 137,548 135,721
Asset-backed securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 20,748 46,660
Gross Unrealized Gains 0 0
Gross Unrealized Losses (9) (36)
Fair Value 20,739 46,624
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 116,821 89,126
Gross Unrealized Gains 29 8
Gross Unrealized Losses (41) (37)
Fair Value $ 116,809 $ 89,097