Geographic Information (Revenue by Geographic Locations) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Reportable_Segments	Mar. 31, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Reportable_Segments	1
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 1,228,445	$ 871,577
Operating revenue	142,924	108,230
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	398,093	396,775
Operating revenue	46,075	49,902
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	5,902	6,381
Operating revenue	1,051	1,600
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	16,528	22,499
Operating revenue	4,022	5,394
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	2,252	1,713
Operating revenue	8,625	9,487
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
Pre-Existing Revenue	1,100
Long-lived assets	18,156	17,950
Operating revenue	2,129	2,216
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	171	289
Operating revenue	522	487
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	706,084	344,568
Operating revenue	72,908	32,003
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	24,147	27,317
Operating revenue	3,787	4,031
INDONESIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	78	109
Operating revenue	2,545	1,541
PHILIPPINES
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	588	550
Operating revenue	1,150	1,348
UNITED ARAB EMIRATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	56,446	53,426
Operating revenue	110	$ 221
Indian Led [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue	$ 77,700