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Acquisitions Pro Forma Table (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
As Reported
    
Business Acquisition [Line Items]    
Total revenue from continuing operations $ 660,848 $ 592,091
Income from continuing operations 84,479 80,862
Net income 83,846 80,359
Income from continuing operations per basic share $ 2.91 $ 2.80
Income from continuing operations per diluted share $ 2.86 $ 2.72
Net income per basic share $ 2.89 $ 2.78
Net income per diluted share $ 2.84 $ 2.70
Pro Forma
    
Business Acquisition [Line Items]    
Total revenue from continuing operations 713,329 672,411
Income from continuing operations 89,971 89,908
Net income $ 89,338 $ 89,405
Income from continuing operations per basic share $ 3.09 $ 3.11
Income from continuing operations per diluted share $ 3.04 $ 3.03
Net income per basic share $ 3.07 $ 3.09
Net income per diluted share $ 3.02 $ 3.01