Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue	$ 973,089	$ 853,297	$ 2,740,697	$ 2,392,221
Cost of services and products	731,234	647,805	2,091,136	1,824,490
Gross Margin	241,855	205,492	649,561	567,731
Selling, general and administrative expense	59,937	51,756	173,470	159,368
Income from Operations	181,918	153,736	476,091	408,363
Interest income	130	39	250	472
Interest expense	(677)	(851)	(1,486)	(2,167)
Equity earnings (losses) of unconsolidated affiliates	9	134	(19)	109
Other income (expense), net	(392)	(639)	(515)	(840)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	180,988	152,419	474,321	405,937
Provision for income taxes	56,650	48,012	148,463	127,870
Net Income	$ 124,338	$ 104,407	$ 325,858	$ 278,067
Cash Dividends declared per Share	$ 0.27	$ 0.22	$ 0.76	$ 0.62
Basic Earnings per Share	$ 1.16	$ 0.97	$ 3.03	$ 2.57
Diluted Earnings per Share	$ 1.16	$ 0.96	$ 3.01	$ 2.56