Investments (Investments Held to Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Gain (Loss) on Investments [Line Items]
Amortized Cost	$ 21,924	$ 27,021
Gross Unrealized Gain	13	18
Gross Unrealized (Loss)	(14)	0
Fair Value	21,923	27,039
Current Assets [Member]
Gain (Loss) on Investments [Line Items]
Amortized Cost	16,079	16,040
Gross Unrealized Gain	13	11
Gross Unrealized (Loss)	0	0
Fair Value	16,092	16,051
Non Current Assets [Member]
Gain (Loss) on Investments [Line Items]
Amortized Cost	5,845	10,981
Gross Unrealized Gain	0	7
Gross Unrealized (Loss)	(14)	0
Fair Value	$ 5,831	$ 10,988