Employee Benefit Plans - Net Gratuity Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Retirement Benefits [Abstract]
Service cost	$ 678	$ 487
Interest cost	243	219
Expected return on plan assets	(161)	(142)
Amortization of actuarial loss/(gain)	101	(39)
Net gratuity cost	$ 861	$ 525