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Investments (Investments Held to Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Gain (Loss) on Investments [Line Items]    
Amortized Cost $ 20,518 $ 17,483
Gross Unrealized Gain 0 0
Gross Unrealized (Loss) (16) (33)
Fair Value 20,502 17,450
Current Assets [Member]    
Gain (Loss) on Investments [Line Items]    
Amortized Cost 20,518 12,444
Gross Unrealized Gain 0 0
Gross Unrealized (Loss) (16) (16)
Fair Value 20,502 12,428
Non Current Assets [Member]    
Gain (Loss) on Investments [Line Items]    
Amortized Cost 0 5,039
Gross Unrealized Gain 0 0
Gross Unrealized (Loss) 0 (17)
Fair Value $ 0 $ 5,022