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Investments (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items] |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax | $ (13,900,000) |  |
Investment in Marketable Securities (Textual) [Abstract] |  |  |
Unrealized gain (loss) on available for sale securities | (8,489,000) | (3,351,000) | (4,975,000)
Impairment loss | 18,308,000 | 605,000 | 0
Short term investments | 0 | 999,000 | 20,254,000
Marketable securities [Member] |  |  |
Available-for-sale Securities |  |  |
Cost | 17,649,000 | 34,786,000 |
Gross Unrealized Losses | (3,300,000) | (10,443,000) |
Gross Unrealized Gains | 172,000 | 2,722,000 |
Available-for-sale Securities, Estimated Fair Value | 14,521,000 | 27,065,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Unrealized Losses, Less than twelve months | (3,300,000) |  |
Unrealized Losses, Twelve months or more | 0 |  |
Unrealized Losses Total | (3,300,000) | (10,443,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Fair Value, Less than twelve months | 4,146,000 |  |
Fair Value, Twelve months or more | 0 |  |
Fair Value, Total | $ 4,146,000 |  |

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