Employee Benefit Plans - Net Gratuity Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Retirement Benefits [Abstract]
Service cost	$ 664	$ 493	$ 1,342	$ 980
Interest cost	237	221	480	440
Expected return on plan assets	(157)	(144)	(318)	(286)
Amortization of actuarial (gain)/loss	97	(40)	198	(79)
Net gratuity cost	$ 841	$ 530	$ 1,702	$ 1,055