Segment and Related Information - Financial Information by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 247,664	$ 235,329	$ 236,262	$ 227,293	$ 204,389	$ 201,663	$ 183,020	$ 158,691	$ 946,548	$ 747,763	$ 471,496
Long-Lived Assets	388,026				392,926				388,026	392,926	333,496
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									626,656	460,872	214,026
Long-Lived Assets	338,475				337,190				338,475	337,190	274,746
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									67,374	55,600	34,176
Long-Lived Assets	3,284				3,993				3,284	3,993	3,922
Algeria [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									81,508	87,975	80,936
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									124,510	102,247	96,654
Long-Lived Assets	41,774				46,269				41,774	46,269	48,047
Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									28,767	36,988	41,035
Long-Lived Assets	1,595				2,354				1,595	2,354	4,842
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									17,733	4,081	4,669
Long-Lived Assets	$ 2,898				$ 3,120				$ 2,898	$ 3,120	$ 1,939