Annual report pursuant to Section 13 and 15(d)

Acquisitions (Condensed Combined Statements Of Income Pro Forma Information) (Details)

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Acquisitions (Condensed Combined Statements Of Income Pro Forma Information) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Acquisitions [Abstract]    
Revenue $ 1,023,430 $ 784,964
Net income (loss) $ 180,779 $ 113,783
Basic and diluted earnings (loss) per common share $ 2.39 $ 1.52