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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues	$ 685,173	$ 626,528
Cost of services	467,436	428,384
Gross profit	217,737	198,144
Selling, general and administrative expenses	164,444	146,072
Amortization of intangible assets	7,601	8,464
Operating income	45,692	43,608
Interest expense	(6,545)	(8,501)
Income before income taxes	39,147	35,107
Provision for income taxes	9,907	12,725
Income from continuing operations	29,240	22,382
Income (loss) from discontinued operations, net of income taxes	(148)	9
Net income	$ 29,092	$ 22,391
Per share income from continuing operations and net income:
Basic	$ 0.56	$ 0.43
Diluted	$ 0.55	$ 0.42
Number of shares and share equivalents used to calculate earnings per share:
Basic	52,178	52,658
Diluted	52,831	53,249
Reconciliation of net income to comprehensive income:
Net income	$ 29,092	$ 22,391
Foreign currency translation adjustment	1,475	702
Comprehensive income	$ 30,567	$ 23,093

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