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Segment Reporting (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2011 | Dec. 31, 2010
--- | --- | --- | --- | --- | --- | ---
Assets |  |  |  |  |  |
Total assets for reportable segments |  | $ 2,974,056 |  | $ 2,963,130 |  |
Cash and cash equivalents | 206,690 | 125,440 | 175,012 | 175,012 | 66,118 | 66,118
Short term investments | 0 | 999 |  | 20,254 |  |
Other assets | 120,469 | 120,906 |  | 106,045 |  |
TOTAL ASSETS | $ 2,885,978 | $ 3,221,401 |  | $ 3,264,441 |  |

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