Investments (Investments Held to Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Gain (Loss) on Investments [Line Items]
Amortized Cost	$ 24,779	$ 27,021
Gross Unrealized Gain	30	18
Gross Unrealized (Loss)	(11)	0
Fair Value	24,798	27,039
Current Assets [Member]
Gain (Loss) on Investments [Line Items]
Amortized Cost	19,097	16,040
Gross Unrealized Gain	30	11
Gross Unrealized (Loss)	0	0
Fair Value	19,127	16,051
Non Current Assets [Member]
Gain (Loss) on Investments [Line Items]
Amortized Cost	5,682	10,981
Gross Unrealized Gain	0	7
Gross Unrealized (Loss)	(11)	0
Fair Value	$ 5,671	$ 10,988