Segment Reporting (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	$ 1,134,716		$ 1,134,716		$ 1,084,306
Revenues
Revenue	169,987	$ 149,540	333,254	$ 335,094
United States
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	391,026		391,026		377,768
Revenues
Revenue	99,243	95,371	192,473	202,565
Canada
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	375,199		375,199		331,440
Mexico
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	358,080		358,080		370,188
Revenues
Revenue	70,744	53,235	140,781	130,939
Australia
Revenues
Revenue	0	$ 934	0	$ 1,590
Other Foreign Countries [Member]
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	$ 10,411		$ 10,411		$ 4,910