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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenues $ 1,685,201 $ 1,250,819 $ 4,627,074 $ 3,110,692
Cost of services (including depreciation) 1,404,767 1,056,129 3,915,718 2,691,021
Gross profit 280,434 194,690 711,356 419,671
Selling, general and administrative expenses 124,276 92,414 345,633 273,444
Amortization of intangible assets 10,504 8,295 29,447 21,432
Operating income 145,654 93,981 336,276 124,795
Interest expense (967) (738) (2,510) (1,248)
Interest income 384 226 1,179 761
Other income (expense), net 1,138 (528) 993 (394)
Income before income taxes 146,209 92,941 335,938 123,914
Provision for income taxes 45,353 37,341 115,291 50,306
Net income 100,856 55,600 220,647 73,608
Less: Net income attributable to noncontrolling interests 4,458 3,606 13,004 7,407
Net income attributable to common stock $ 96,398 $ 51,994 $ 207,643 $ 66,201
Earnings per share attributable to common stock:        
Basic earnings per share $ 0.45 $ 0.25 $ 0.98 $ 0.31
Diluted earnings per share $ 0.45 $ 0.25 $ 0.98 $ 0.31
Shares used in computing earnings per share:        
Weighted average basic shares outstanding 213,150 210,583 212,564 213,400
Weighted average diluted shares outstanding 213,242 210,692 212,650 214,055