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Investments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Short-term Investments [Member] | Dec. 31, 2013 Marketable securities [Member] | Jun. 30, 2014 Marketable securities [Member]
Available-for-sale Securities |  |  |  |  |  |  |
Cost |  |  |  |  | $ 47,661 | $ 17,649 | $ 13,972
Gross Unrealized Losses |  |  |  |  | (31) | (3,300) | (677)
Gross Unrealized Gains |  |  |  |  | 12 | 172 | 466
Available-for-sale Securities, Estimated Fair Value |  |  |  |  | 47,642 | 14,521 | 13,761
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |  |  |  |  |
Unrealized Losses Total |  |  |  |  | (31) | (3,300) | (677)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |  |  |
Less than twelve Months, Unrealized Losses |  |  |  |  | (31) |  | 0
Less than twelve Months, Fair Value |  |  |  |  | 29,090 |  | 0
Twelve months or more, Unrealized Losses |  |  |  |  | 0 |  | (677)
Twelve months or more, Fair Value |  |  |  |  | 0 |  | 1,399
Unrealized Losses |  |  |  |  | (31) |  | (677)
Fair Value |  |  |  |  | 29,090 |  | 1,399
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |  |  |  |
Unrealized gain (loss) on available for sale securities | (773) | (7,491) | (401) | (11,057) |  |  |
Impairment of marketable securities | $ 934 | $ 17,192 | $ 3,522 | $ 17,227 |  |  |

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