Segment and Geographical Information - Long-lived Assets by Country (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-life assets	$ 1,996,074	$ 902,431
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-life assets	840,315	902,431
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-life assets	926,774	0
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-life assets	$ 228,985	$ 0