Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue	$ 820,372	$ 672,545	$ 1,538,924	$ 1,267,438
Cost of services and products	618,508	511,387	1,176,685	982,977
Gross Profit	201,864	161,158	362,239	284,461
Selling, general and administrative expense	55,527	51,111	107,612	98,427
Income from Operations	146,337	110,047	254,627	186,034
Interest income	243	194	433	538
Interest expense	(553)	(1,256)	(1,316)	(1,801)
Equity earnings (losses) of unconsolidated affiliates	(186)	119	(25)	923
Other income (expense), net	(1,591)	(3,186)	(201)	(4,659)
Income before Income Taxes	144,250	105,918	253,518	181,035
Provision for income taxes	45,439	33,364	79,858	57,026
Net Income	$ 98,811	$ 72,554	$ 173,660	$ 124,009
Cash Dividends declared per Share	$ 0.22	$ 0.18	$ 0.40	$ 0.33
Basic Earnings per Share	$ 0.91	$ 0.67	$ 1.61	$ 1.15
Diluted Earnings per Share	$ 0.91	$ 0.67	$ 1.60	$ 1.14