Segment and Geographic Area Information Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Long-lived assets	$ 2,996,661	$ 2,793,599	$ 2,735,879
United States
Segment Reporting Information [Line Items]
Long-lived assets	833,002	850,689	800,214
Chile
Segment Reporting Information [Line Items]
Long-lived assets	1,069,859	922,878	916,965
Netherlands
Segment Reporting Information [Line Items]
Long-lived assets	171,980	145,917	155,128
Jordan
Segment Reporting Information [Line Items]
Long-lived assets	242,626	227,222	230,460
Australia
Segment Reporting Information [Line Items]
Long-lived assets	364,624	288,553	280,222
Brazil
Segment Reporting Information [Line Items]
Long-lived assets	47,255	46,380	39,299
Germany
Segment Reporting Information [Line Items]
Long-lived assets	115,305	117,027	137,890
China
Segment Reporting Information [Line Items]
Long-lived assets	50,532	31,564	4,773
France
Segment Reporting Information [Line Items]
Long-lived assets	40,852	39,470	39,344
Korea(b)
Segment Reporting Information [Line Items]
Long-lived assets	495	65,963	72,685
Other foreign countries
Segment Reporting Information [Line Items]
Long-lived assets	$ 60,131	$ 57,936	$ 58,899