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Acquisitions (Business Acquisition, Pro Forma Information) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Business Acquisition, Pro Forma Information [Abstract]    
Revenues $ 1,459,762 $ 1,266,523
Business Acquisitions Pro Forma Operating Income 113,738 64,292
Operating income 51,373 23,574
Net income $ 55,615 $ 26,109
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic $ 0.99 $ 0.46
Basic earnings per share (in dollars per share) $ 1.07 $ 0.51
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted $ 0.97 $ 0.45
Diluted earnings per share (in dollars per share) $ 1.05 $ 0.50
Weighted average number of shares outstanding 52,103 51,180
Weighted average number of shares and dilutive shares outstanding 53,190 52,062