Investments (Investments Held to Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Gain (Loss) on Investments [Line Items]
Amortized Cost	$ 6,176	$ 15,987
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(9)	(23)
Fair Value	6,167	15,964
Current Assets [Member]
Gain (Loss) on Investments [Line Items]
Amortized Cost	6,101	11,972
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(9)	(7)
Fair Value	6,092	11,965
Non Current Assets [Member]
Gain (Loss) on Investments [Line Items]
Amortized Cost	75	4,015
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	0	(16)
Fair Value	$ 75	$ 3,999