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Business Combinations (Pro Forma Impact Of Business Combination And Acquisitions) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Business Acquisition [Line Items]        
Revenues, Pro Forma $ 127,489 [1] $ 125,405 [1] $ 250,967 [1] $ 245,549 [1]
Net income, Pro Forma 33,871 [1] 3,713 [1] 57,720 [1] 21,720 [1]
Net income (loss) attributable to common shareholders, Pro Forma $ 23,660 [1] $ (6,392) [1] $ 37,199 [1] $ 1,654 [1]
Earnings per share - basic, Pro Forma $ 0.20 [1] $ (0.05) [1] $ 0.31 [1] $ 0.01 [1]
Earnings per share - diluted, Pro Forma $ 0.19 [1] $ (0.05) [1] $ 0.31 [1] $ 0.01 [1]
[1] There are no non-recurring pro forma adjustments included within or excluded from the amounts in the preceding table.