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COST OF REVENUES AND SELLING, GENERAL AND ADMINISTRATIVE EXPENSES - Cost of Revenues (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Analysis of income and expense [abstract]

Salaries, employee benefits and social security taxes

$ (366,594)

$ (293,171)

$ (239,013)

Shared-based compensation expense

(4,976)

(4,248)

(5,666)

Depreciation and amortization expense

(7,350)

(4,022)

(4,339)

Travel and housing

(17,115)

(6,623)

(6,631)

Office expenses

(2,583)

(2,082)

(1,692)

Professional services

(4,440)

(5,248)

(5,005)

Promotional and marketing expenses

(252)

(1,575)

(244)

Recruiting, training and other employee expenses

(1,854)

(1,382)

(415)

Taxes

0

(203)

(166)

Cost of sales

^[1],[2]

$ (405,164)

$ (318,554)

$ (263,171)

[1]	Includes depreciation and amortization expense of 7,350, 4,022 and 4,339 for 2019, 2018 and 2017, respectively. See note 6.1.
[2]	Includes share-based compensation expense of 4,976, 4,248 and 5,666 under cost of revenues; and 14,912, 8,665 and 8,798 under selling, general and administrative expenses for 2019, 2018 and 2017, respectively. See note 6.