CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues	$ 629,401	$ 572,123	$ 1,819,529	$ 1,487,491
Cost of services	422,281	380,719	1,222,541	1,001,678
Gross profit	207,120	191,404	596,988	485,813
Selling, general and administrative expenses	141,968	128,614	423,199	353,416
Amortization of intangible assets	9,742	11,325	29,918	23,151
Operating income	55,410	51,465	143,871	109,246
Interest expense, net	(8,294)	(9,543)	(25,278)	(17,346)
Write-off of loan costs	0	0	0	3,751
Income before income taxes	47,116	41,922	118,593	88,149
Provision for income taxes	17,341	17,031	45,457	35,900
Income from continuing operations	29,775	24,891	73,136	52,249
Gain on sale of discontinued operations, net of income taxes	0	0	0	25,703
Income (loss) from discontinued operations, net of income taxes	(7)	34	37	360
Net income	$ 29,768	$ 24,925	$ 73,173	$ 78,312
Basic earnings per common share:
Income from continuing operations	$ 0.56	$ 0.47	$ 1.37	$ 1.00
Discontinued operations	0.00	0.00	0.00	0.50
Net income	0.56	0.47	1.37	1.50
Diluted earnings per common share:
Income from continuing operations	0.55	0.47	1.36	0.99
Discontinued operations	0.00	0.00	0.00	0.49
Net income	$ 0.55	$ 0.47	$ 1.36	$ 1.48
Number of shares and share equivalents used to calculate earnings per share:
Basic	53,275	52,654	53,281	52,053
Diluted	53,768	53,304	53,787	52,759
Reconciliation of net income to comprehensive income:
Net income	$ 29,768	$ 24,925	$ 73,173	$ 78,312
Changes in fair value of derivative, net of tax	0	0	0	122
Foreign currency translation adjustment	420	290	680	(2,606)
Comprehensive income	$ 30,188	$ 25,215	$ 73,853	$ 75,828