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Business Combinations (Pro Forma Impact Of Business Combination) (Details) (USD $)
In Thousands, except Per Share data
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Business Combinations        
Revenues, pro forma $ 141,253 [1] $ 138,632 [1] $ 276,234 [1] $ 275,995 [1]
Net income, pro forma 2,887 [1] 3,703 [1] 20,066 [1] 23,187 [1]
Net (loss) income attributable to common shareholders, pro forma $ (7,218) [1] $ (5,504) [1]   $ 4,383 [1]
Earnings per share - basic, pro froma $ (0.06) [1] $ (0.05) [1]   $ 0.04 [1]
Earning per share - diluted, pro forma $ (0.06) [1] $ (0.05) [1]   $ 0.04 [1]
[1] There are no non-recurring pro forma adjustments included within or excluded from the amounts in the preceding table.