Segment Reporting (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	$ 771,259		$ 771,259		$ 786,908
Revenues
Revenues	175,963	$ 176,247	555,455	$ 506,641
UNITED STATES
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	375,728		375,728		338,897
Revenues
Revenues	99,093	117,425	301,658	317,315
Mexico
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	366,960		366,960		397,697
Revenues
Revenues	60,677	30,663	191,616	109,674
BOLIVIA
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	27,662		27,662		31,539
Revenues
Revenues	16,043	27,485	60,441	73,948
AUSTRALIA
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	0		0		2,983
Revenues
Revenues	150	812	1,740	3,207
ARGENTINA
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	228		228		10,228
Other Foreign Countries [Member]
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	681		681		$ 5,564
Revenues
Revenues	$ 0	$ (138)	$ 0	$ 2,497