Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Details 1)

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Acquisitions (Details 1) (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
Unaudited supplemental pro forma results of operations        
Revenues $ 1,516,696 $ 1,067,363 $ 2,955,434 $ 1,969,191
Gross profit 235,407 172,086 432,878 257,542
Selling, general and administrative expenses 114,711 96,319 222,485 194,483
Amortization of intangible assets 9,549 10,117 19,032 20,249
Net income attributable to common stock $ 65,533 $ 37,184 $ 111,649 $ 22,499
Earnings per share attributable to common stock:        
Basic $ 0.31 $ 0.17 $ 0.52 $ 0.10
Diluted $ 0.31 $ 0.17 $ 0.52 $ 0.10