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Business Combinations (Pro Forma Impact Of Acquisitions) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Business Acquisition [Line Items]    
Revenues, Pro Forma $ 123,544 [1] $ 360,501 [1]
Net income, Pro Forma 42,041 [1] 97,052 [1]
Net income attributable to common shareholders, Pro Forma $ 31,398 [1] $ 65,888 [1]
Earnings per share - basic, Pro Forma $ 0.26 [1] $ 0.55 [1]
Earnings per share - diluted, Pro Forma $ 0.26 [1] $ 0.54 [1]
[1] There are no non-recurring pro forma adjustments included within or excluded from the amounts in the preceding table.