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Segment Reporting (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Long Lived Assets |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets, Total | $ 2,237,774 |  |  |  | $ 2,675,811 |  |  |  | $ 2,237,774 | $ 2,675,811 | $ 2,688,703
Revenues |  |  |  |  |  |  |  |  |  |  |
Total Revenue | 168,847 | 200,825 | 204,525 | 171,797 | 205,929 | 230,593 | 254,406 | 204,564 | 745,994 | 895,492 | 1,021,200
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets in Entity's Country of Domicile | 384,626 |  |  |  | 608,051 |  |  |  | 384,626 | 608,051 | 515,096
Revenues |  |  |  |  |  |  |  |  |  |  |
Total Revenue |  |  |  |  |  |  |  |  | 268,023 | 243,379 | 208,517
Australia [Member] |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets in Individual Foreign Countries | 25,668 |  |  |  | 29,408 |  |  |  | 25,668 | 29,408 | 33,999
Revenues |  |  |  |  |  |  |  |  |  |  |
Total Revenue |  |  |  |  |  |  |  |  |  | 18,848 | 18,737
Argentina [Member] |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets in Individual Foreign Countries | 94,705 |  |  |  | 1,705 |  |  |  | 94,705 | 1,705 | 5,213
Revenues |  |  |  |  |  |  |  |  |  |  |
Total Revenue |  |  |  |  |  |  |  |  |  | 13,162 | 13,347
Bolivia [Member] |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets in Individual Foreign Countries | 235,085 |  |  |  | 240,905 |  |  |  | 235,085 | 240,905 | 230,956
Revenues |  |  |  |  |  |  |  |  |  |  |
Total Revenue |  |  |  |  |  |  |  |  |  | 178,005 | 267,502
Mexico [Member] |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets in Individual Foreign Countries | 1,487,228 |  |  |  | 1,795,677 |  |  |  | 1,487,228 | 1,795,677 | 1,903,374
Revenues |  |  |  |  |  |  |  |  |  |  |
Total Revenue |  |  |  |  |  |  |  |  |  | 442,098 | 513,097
Other Foreign Countries [Member] |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets in Individual Foreign Countries | $ 10,462 |  |  |  | $ 65 |  |  |  | $ 10,462 | $ 65 | $ 65

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