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Segment Reporting (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Long Lived Assets |  |  |  |  |
Long Lived Assets in Entity's Country of Domicile | $ 769,379 |  | $ 769,379 |  | $ 787,986
Revenues |  |  |  |  |
Revenue | 182,007 | $ 166,263 | 330,394 | $ 319,219 |
United States [Member] |  |  |  |  |
Long Lived Assets |  |  |  |  |
Long Lived Assets in Entity's Country of Domicile | 332,007 |  | 332,007 |  | 336,210
Revenues |  |  |  |  |
Revenue | 106,236 | 99,180 | 199,890 | 187,249 |
Mexico [Member] |  |  |  |  |
Long Lived Assets |  |  |  |  |
Long Lived Assets in Entity's Country of Domicile | 387,562 |  | 387,562 |  | 390,694
Revenues |  |  |  |  |
Revenue | 48,489 | 39,443 | 79,011 | 79,584 |
BOLIVIA |  |  |  |  |
Long Lived Assets |  |  |  |  |
Long Lived Assets in Entity's Country of Domicile | 31,297 |  | 31,297 |  | 35,201
Revenues |  |  |  |  |
Revenue | 25,185 | 23,366 | 46,463 | 44,913 |
Australia [Member] |  |  |  |  |
Long Lived Assets |  |  |  |  |
Long Lived Assets in Entity's Country of Domicile | 3,235 |  | 3,235 |  | 5,952
Revenues |  |  |  |  |
Revenue | 504 | 3,083 | 2,395 | 5,028 |
ARGENTINA |  |  |  |  |
Long Lived Assets |  |  |  |  |
Long Lived Assets in Entity's Country of Domicile | 10,227 |  | 10,227 |  | 10,871
Other Foreign Countries [Member] |  |  |  |  |
Long Lived Assets |  |  |  |  |
Long Lived Assets in Entity's Country of Domicile | 5,051 |  | 5,051 |  | $ 9,058
Revenues |  |  |  |  |
Revenue | $ 1,593 | $ 1,191 | $ 2,635 | $ 2,445 |

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