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Segment Reporting (Details 1) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Segment Reporting [Abstract] |  |  |  |
Assets, Net |  | $ 2,558,819 |  |
Assets |  |  |  |
Cash and cash equivalents | 272,932 | 206,690 | 331,311 | 125,440
Short term investments | 45,628 | 0 |  |
Other assets | 116,529 | 120,469 |  |
TOTAL ASSETS | $ 2,986,985 | $ 2,885,978 |  |

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