Other Current Assets - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Derivative instruments	$ 5,367	$ 4,059
Advances to suppliers	3,007	2,910
Receivables from statutory authorities	15,796	14,145
Contract assets	1,203	1,201
Deferred contract fulfillment costs	1,267	1,236
Others	5,089	4,689
Other current assets	$ 31,729	$ 28,240