Annual report pursuant to Section 13 and 15(d)

Acquisitions (Details 1)

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Acquisitions (Details 1) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Unaudited supplemental pro forma results of operations      
Revenues $ 4,700,382 $ 4,212,447 $ 4,717,882
Gross profit 645,477 701,314 914,737
Selling, general and administrative expenses 381,290 367,373 379,210
Amortization of intangible assets 34,253 55,756 55,532
Net income attributable to common stock $ 141,123 $ 167,361 $ 304,304
Earnings per share attributable to common stock:      
Basic $ 0.66 $ 0.78 $ 1.43
Diluted $ 0.66 $ 0.77 $ 1.41