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Acquisitions Pro Forma Table (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
As Reported
    
Business Acquisition [Line Items]    
Total revenue from continuing operations $ 303,974 $ 267,011
Income from continuing operations 35,927 33,785
Net income 35,927 33,861
Income from continuing operations per basic share (in dollars per share) $ 1.23 $ 1.16
Income from continuing operations per diluted share (in dollars per share) $ 1.21 $ 1.13
Net income per basic share (in dollars per share) $ 1.23 $ 1.16
Net income per diluted share (in dollars per share) $ 1.21 $ 1.13
Pro Forma
    
Business Acquisition [Line Items]    
Total revenue from continuing operations 329,230 291,750
Income from continuing operations 39,039 36,915
Net income $ 39,039 $ 36,991
Income from continuing operations per basic share (in dollars per share) $ 1.34 $ 1.27
Income from continuing operations per diluted share (in dollars per share) $ 1.31 $ 1.24
Net income per basic share (in dollars per share) $ 1.34 $ 1.27
Net income per diluted share (in dollars per share) $ 1.31 $ 1.24