Geographic Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments | segment	1
Number of reportable segments | segment	1
Operating revenue:	$ 994,938	$ 625,609	$ 580,615
Long-lived assets	1,194,291	1,207,955	1,227,684
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue:	755,543	378,660	300,678
Long-lived assets	693,709	698,936	700,986
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue:	155,346	166,320	182,530
Long-lived assets	377,305	381,782	395,225
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue:	37,820	33,846	33,268
Long-lived assets	2,928	3,581	3,541
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue:	16,366	13,145	14,695
Long-lived assets	23,304	22,900	24,508
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue:	12,901	14,801	19,755
Long-lived assets	12,696	13,723	17,176
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue:	5,333	4,383	4,805
Long-lived assets	5,886	6,930	7,012
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue:	3,875	3,969	6,549
Long-lived assets	17,260	19,336	18,282
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue:	2,007	1,804	1,955
Long-lived assets	367	513	578
United Arab Emirates
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue:	1,982	3,335	683
Long-lived assets	54,254	54,789	54,887
Indonesia
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue:	1,981	3,206	9,706
Long-lived assets	95	139	117
Philippines
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue:	1,784	2,140	5,991
Long-lived assets	1,824	661	729
Mauritius
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue:	0	0	0
Long-lived assets	4,663	4,665	4,643
Indian led
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenue:	$ 762,300	$ 388,300	$ 320,000