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Business Combinations (Pro Forma Impact Of Acquisitions) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition [Line Items]        
Revenues $ 141,232 $ 139,444 $ 424,472 $ 409,049
Net income 53,437 47,021 167,642 183,693
Net income attributable to common shareholders - basic 44,001 45,234 154,778 165,057
Net income attributable to common shareholders - diluted $ 44,001 $ 45,706 $ 156,275 $ 165,057
Earnings per share – basic (usd per share) $ 0.35 $ 0.37 $ 1.23 $ 1.34
Earnings per share – diluted (usd per share) $ 0.34 $ 0.36 $ 1.22 $ 1.33