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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

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