Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue	$ 672,545	$ 545,838	$ 1,267,438	$ 1,016,258
Cost of services and products	511,387	419,722	982,977	791,341
Gross Margin	161,158	126,116	284,461	224,917
Selling, general and administrative expense	51,111	44,442	98,427	82,176
Income from Operations	110,047	81,674	186,034	142,741
Interest income	194	89	538	256
Interest expense	(1,256)	(212)	(1,801)	(359)
Equity earnings of unconsolidated affiliates	119	1,430	923	1,900
Other income (expense), net	(3,186)	(217)	(4,659)	(358)
Income before Income Taxes	105,918	82,764	181,035	144,180
Provision for income taxes	33,364	26,071	57,026	45,417
Net Income	$ 72,554	$ 56,693	$ 124,009	$ 98,763
Cash Dividends declared per Share	$ 0.18	$ 0.15	$ 0.33	$ 0.15
Basic Earnings per Share	$ 0.67	$ 0.52	$ 1.15	$ 0.91
Diluted Earnings per Share	$ 0.67	$ 0.52	$ 1.14	$ 0.91