QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

Summarized quarterly results for the years ended December 31, 2020 and 2019 were as follows:

	Three Months Ended
2020	March 31		June 30		September 30		December 31		Full Year
Revenues	$	651,359	$	632,383	$	652,243	$	723,493	$	2,659,478
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization)	423,802		419,540		423,388		465,792		1,732,522
Selling, general and administrative expenses	125,108		114,191		116,530		128,929		484,758
Depreciation and amortization expense	14,940		15,226		15,929		16,779		62,874
Income from operations	87,509		83,426		96,396		111,993		379,324
Interest and other income/(expense), net	2,386		1,817		1,672		(2,053)		3,822
Foreign exchange gain/(loss)	6,524		(9,167)		5,896		(7,920)		(4,667)
Income before provision for income taxes	96,419		76,076		103,964		102,020		378,479
Provision for income taxes	10,854		9,452		14,532		16,481		51,319
Net income	$	85,565	$	66,624	$	89,432	$	85,539	$	327,160
Comprehensive income	$	47,678	$	85,512	$	89,133	$	110,699	$	333,022
Basic net income per share(1)	$	1.55	$	1.20	$	1.60	$	1.53	$	5.87
Diluted net income per share(1)	$	1.47	$	1.14	$	1.53	$	1.46	$	5.60

(1)Earnings per share amounts for each quarter may not necessarily total to the yearly earnings per share due to the weighting of shares outstanding on a quarterly and year to date basis.

	Three Months Ended
2019	March 31		June 30		September 30		December 31		Full Year
Revenues	$	521,333	$	551,587	$	588,103	$	632,775	$	2,293,798
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization)	344,689		355,915		377,525		410,069		1,488,198
Selling, general and administrative expenses	101,786		111,762		118,886		124,999		457,433
Depreciation and amortization expense	10,200		11,028		11,127		12,962		45,317
Income from operations	64,658		72,882		80,565		84,745		302,850
Interest and other income, net	3,076		1,190		2,509		1,950		8,725
Foreign exchange loss	(3,484)		(3,562)		(3,105)		(1,898)		(12,049)
Income before provision for income taxes	64,250		70,510		79,969		84,797		299,526
Provision for income taxes	3,496		11,733		12,967		10,273		38,469
Net income	$	60,754	$	58,777	$	67,002	$	74,524	$	261,057
Comprehensive income	$	66,797	$	62,934	$	54,725	$	86,741	$	271,197
Basic net income per share(1)	$	1.12	$	1.07	$	1.22	$	1.35	$	4.77
Diluted net income per share(1)	$	1.06	$	1.02	$	1.16	$	1.29	$	4.53

(1)Earnings per share amounts for each quarter may not necessarily total to the yearly earnings per share due to the weighting of shares outstanding on a quarterly and year to date basis.