CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues	$ 626,528	$ 582,040
Cost of services	428,384	394,258
Gross profit	198,144	187,782
Selling, general and administrative expenses	146,072	139,881
Amortization of intangible assets	8,464	10,144
Operating income	43,608	37,757
Interest expense	(8,501)	(9,025)
Income before income taxes	35,107	28,732
Provision for income taxes	12,725	11,384
Income from continuing operations	22,382	17,348
Income from discontinued operations, net of income taxes	9	53
Net income	$ 22,391	$ 17,401
Basic earnings per common share:
Continuing operations	$ 0.43	$ 0.33
Discontinued operations	0.00	0.00
Net income	0.43	0.33
Diluted earnings per common share:
Continuing operations	0.42	0.32
Discontinued operations	0.00	0.00
Net income	$ 0.42	$ 0.32
Number of shares and share equivalents used to calculate earnings per share:
Basic	52,658	53,147
Diluted	53,249	53,644
Reconciliation of net income to comprehensive income:
Net income	$ 22,391	$ 17,401
Foreign currency translation adjustment	702	1,343
Comprehensive income	$ 23,093	$ 18,744