Segment Reporting (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	$ 1,112,633		$ 1,112,633		$ 729,103
Revenues
Revenue	162,552	$ 170,938	481,770	$ 495,133
United States [Member]
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	349,303		349,303		275,594
Revenues
Revenue	93,091	78,284	280,340	198,710
BOLIVIA
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	98,966		98,966		107,960
Revenues
Revenue		28,350	62,304	84,983
Mexico [Member]
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	621,960		621,960		298,101
Revenues
Revenue	50,170	61,684	129,753	202,851
Australia [Member]
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	17,099		17,099		21,362
Revenues
Revenue	1,264	2,367	6,292	7,227
Argentina [Member]
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	10,925		10,925		10,970
Other Foreign Countries [Member]
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	14,380		14,380		$ 15,116
Revenues
Revenue	$ 636	$ 253	$ 3,081	$ 1,362