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
Mar. 31, 2012
Mar. 31, 2011
Unaudited supplemental pro forma results of operations    
Revenues $ 1,425,899 $ 889,072
Gross profit 195,799 83,229
Selling, general and administrative expenses 106,714 96,647
Amortization of intangible assets 9,398 8,907
Net income (loss) attributable to common stock $ 45,837 $ (14,346)
Earnings (loss) per share attributable to common stock:    
Basic $ 0.22 $ (0.07)
Diluted $ 0.22 $ (0.07)